22 1/2 Degree Elbow, PVC Schedule 80 Slip x Slip 10" (865-100)

The 10" Schedule 80 Gray PVC 22.5 Degree Elbow (865-100, Slip x Slip) is a large-diameter, heavy-wall thermoplastic direction-change fitting manufactured to ASTM D2467 in Schedule 80 gray PVC — a two-port fitting in which both connections are 10" IPS slip socket ends, providing a single-body Schedule 80 PVC solution for changing the direction of a 10" Schedule 80 PVC primary main by exactly 22.5 degrees at a primary main layout direction-change location, without a mitered field fabrication joint, without transitioning out of Schedule 80 gray PVC construction at the direction-change point, and without changing the primary main's pipe size or dividing its flow at the bend location. The 865-100 is the correct fitting wherever a 10" Schedule 80 PVC primary main must change direction by 22.5 degrees — where the upstream 10" IPS pipe end enters the elbow's inlet socket in the primary main's upstream routing direction, the fitting body turns the flow axis by exactly 22.5 degrees through the manufactured elbow geometry, and the downstream 10" IPS pipe exits the elbow's outlet socket in the primary main's new downstream routing direction offset by 22.5 degrees from the upstream axis — and it is equally the component fitting of choice wherever two 865-100 elbows with a connecting 10" IPS pipe section between them are specified for a distributed 45-degree direction change or wherever four 865-100 elbows with connecting pipe sections between them are specified for the lowest-minor-loss distributed 90-degree direction change configuration in the 10" Schedule 80 PVC socket fitting ecosystem. As the gentlest standard direction-change fitting of the 10" Schedule 80 PVC socket fitting ecosystem, the 865-100 produces the smallest resultant angular thrust force per fitting body and the lowest hydraulic minor loss coefficient per fitting body of any standard elbow angle documented in this catalog at the 10" primary main service level — characteristics that establish its value as the preferred component fitting in compound multi-fitting direction change configurations at the large-diameter 10" Schedule 80 primary main scale where hydraulic efficiency and thrust restraint scope are most operationally and economically consequential.

The 865-100's commercial identity is defined by its direction-change function — the same categorical function as the 856-100 and 857-100, executing a change in the primary main's flow direction at a manufactured fitting body without altering the pipe size, dividing the flow into a branch, or adapting another fitting's socket — distinguished from both the 90-degree and 45-degree elbows by the magnitude of the direction change and all hydraulic and civil engineering consequences that flow from that magnitude. The 865-100 does not reduce the pipe size: both sockets are 10" IPS, the primary main continues at full 10" diameter through both ports of the elbow body, and no velocity increase or cross-sectional area reduction occurs at the fitting. The 865-100 does not divide the primary main's flow into a branch: there is no perpendicular branch socket, no continuing run port, and no flow division at the fitting body — the entire primary main flow passes through both the inlet and outlet sockets of the elbow at the same flow rate and the same 10" IPS pipe velocity. The 865-100 does not adapt another fitting's socket: it is an independent fitting body in the primary main pipe run, connected inline between two sections of 10" IPS pipe at a primary main direction-change location. The 865-100's function — and the function that defines every specification decision, every assembly instruction, and every civil engineering consequence applicable to this fitting — is to change the direction of the primary main's flow axis by exactly 22.5 degrees at the fitting body, whether as a standalone 22.5-degree single-body turn, as one of two sequential 22.5-degree turns in the distributed 45-degree configuration, or as one of four sequential 22.5-degree turns in the distributed 90-degree configuration.

The 22.5-degree direction change that the 865-100 executes has a defining hydraulic and structural consequence — the angular thrust force at the bend — that is quantitatively the smallest of any standard elbow angle in the 10" Schedule 80 PVC primary main fitting ecosystem, placing the 865-100 at the lowest-thrust-force end of the standard elbow angle progression in a way that directly governs its multi-fitting compound configuration value. At any pressurized pipe bend of angle θ, the resultant angular thrust force at the fitting body equals 2 × P × A × sin(θ/2), where P is the system operating pressure and A is the pipe's internal cross-sectional area. At a 22.5-degree bend, this formula produces a resultant thrust force of 2 × P × A × sin(11.25°) — approximately 0.390 × P × A — directed at 11.25 degrees outward from the bend corner in the plane of the bend, bisecting the angle between the upstream and downstream pipe axes. The direction of the 865-100's resultant thrust force — at only 11.25 degrees from both the upstream and downstream pipe axes — is nearly aligned with the primary main's routing axis rather than clearly transverse to it, producing a thrust force vector whose direction is closer to the inline pipe barrel direction than to the perpendicular trench wall direction that the 90-degree elbow's 45-degree bisecting resultant approaches. This nearly-inline thrust force direction has direct consequences for the thrust block bearing geometry: the thrust block bearing surface must be oriented perpendicular to the 11.25-degree resultant force direction — nearly perpendicular to the pipe axis and nearly parallel to the trench wall's cross-sectional face — and the undisturbed soil bearing in this nearly-inline direction must be confirmed available in the trench geometry at each buried 865-100 installation.

Comparing the 865-100's resultant thrust force against the documented elbow angles in this catalog at the same 10" IPS pipe size and the same operating pressure: the 865-100's ~0.390 × P × A is approximately 28% of the 856-100's ~1.414 × P × A at 90 degrees, approximately 51% of the 857-100's ~0.765 × P × A at 45 degrees, and approximately 51% of the same-angle 45-degree thrust force at the 12" service level documented at the 417-120 page. At the 10" primary main service level with a full Schedule 80 system operating pressure, the 865-100's ~0.390 × P × A resultant thrust force is still a meaningful civil engineering load — the 10" IPS pipe's cross-sectional area and primary distribution main operating pressure together produce a resultant force at the 22.5-degree bend that requires engineered concrete thrust block construction or approved mechanical joint restraint at every buried 865-100 installation without exception — but its reduced absolute magnitude relative to the 90-degree and 45-degree elbow angles produces a meaningfully smaller required thrust block bearing area at each individual 865-100 bend location, and the distribution of the total 90-degree direction change across four individual 865-100 bend events produces four modest civil thrust restraint engineering elements rather than one large thrust restraint event at a single 90-degree fitting body. In the four-fitting 90-degree distributed configuration, the sum of the four individual 865-100 thrust block bearing areas is larger than the bearing area of a single equivalent 856-100 90-degree thrust block at the same operating pressure — because the trigonometric sum of four 0.390 × P × A thrust events exceeds the single 1.414 × P × A event — but each individual thrust block is substantially smaller, more geometrically manageable in the trench, and engineered independently from a relatively modest site-specific load rather than from the maximum single-fitting thrust event in the primary main's buried fitting inventory. At primary main routing locations where the single 856-100 thrust block bearing area requirement cannot be accommodated in the available trench geometry or soil conditions — in confined routing corridors, tight soil, or urban buried infrastructure environments — the distribution of the 90-degree direction change across four 865-100 bend locations with smaller individual thrust blocks may provide the civil construction feasibility that the single large 856-100 thrust block cannot.

The four-fitting distributed 90-degree configuration of the 865-100 deserves extended treatment as the fitting's most commercially prominent and technically distinctive application context in the 10" Schedule 80 PVC primary main market — the configuration in which the 865-100's specific engineering value over both the single-body 856-100 and the two-fitting 857-100 distributed configuration is most directly realized, and the configuration that governs the 865-100's position in the most hydraulically and civilly demanding direction-change fitting selection decisions at the 10" Schedule 80 primary main scale. When four 865-100 elbows are installed in sequence with connecting 10" IPS pipe sections between each pair — the first 865-100 turning the primary main by 22.5 degrees, the first connecting pipe section extending the routing in the new 22.5-degree-offset direction, the second 865-100 turning an additional 22.5 degrees to reach a total of 45 degrees, the second connecting pipe section, the third 865-100 turning an additional 22.5 degrees to reach 67.5 degrees, the third connecting pipe section, and the fourth 865-100 completing the total 90-degree direction change — the resulting distributed bend geometry produces the lowest combined hydraulic minor loss coefficient of any standard configuration for achieving a 90-degree direction change available in the 10" Schedule 80 PVC socket fitting ecosystem. The four sequential 22.5-degree bends, each separated by a straight connecting pipe section allowing flow reestablishment between sequential bends, produce substantially less aggregate flow separation, turbulence, and secondary flow energy dissipation at the individual bend bodies than either the single 856-100's abrupt 90-degree geometry or the two-fitting 857-100 distributed configuration's pair of 45-degree bends. At the 10" primary main service level — where the primary main carries the largest flow volumes in the 10" Schedule 40 and Schedule 80 distribution system and where the absolute hydraulic minor loss per direction-change fitting event is largest at primary distribution main design flows — the minor loss reduction from the four-fitting 22.5-degree distributed configuration relative to either the 856-100 or the two-fitting 857-100 configuration is most financially and operationally consequential, and the primary system engineer's evaluation of the single-body, two-fitting, and four-fitting configurations at each major 90-degree routing change must include explicit minor loss comparison in the primary main's hydraulic model rather than defaulting to the single-body or two-fitting configuration without hydraulic evaluation.

The practical constraints that govern the feasibility of the four-fitting 22.5-degree distributed 90-degree configuration at each specific primary main routing location are the available routing corridor length in the direction-change zone and the minimum connecting pipe section length between sequential 865-100 elbows. Each connecting pipe section between two sequential 865-100 elbows in the four-fitting configuration must be long enough to allow the flow profile to reestablish substantially between the two sequential bends — a minimum of approximately five to ten pipe diameters, or approximately four to eight feet at the 10" IPS nominal pipe size, between each pair of sequential 865-100 elbows. The four-fitting 90-degree assembly therefore requires a minimum total routing length in the direction-change zone of approximately four fitting body face-to-face dimensions plus three minimum connecting pipe section lengths — a total assembly footprint in the routing corridor of at minimum approximately fifteen to thirty feet at the 10" IPS scale between the inlet socket of the first 865-100 and the outlet socket of the fourth 865-100, with longer connecting pipe sections increasing both the flow reestablishment quality between bends and the total assembly footprint proportionally. This extended total footprint — substantially longer than the two-fitting 857-100 distributed configuration's footprint and dramatically longer than the 856-100 single-body fitting's compact footprint — constrains the four-fitting configuration to routing locations where the primary main's available routing corridor provides this extended straight-run length through the direction-change zone: transmission main routes through open terrain, large-parcel commercial and agricultural property distribution main routes, pump station primary header routes through pump bay structures with adequate depth, and water treatment plant primary header routes through gallery structures with adequate run length through the direction-change zone. At routing locations where the available corridor length cannot accommodate the four-fitting footprint — urban confined right-of-way corridors, constrained pump station vault dimensions, and short routing segments between structure boundaries — the two-fitting 857-100 or single-body 856-100 configuration is the only spatially viable option regardless of the hydraulic preference for the four-fitting 22.5-degree configuration.

The two-fitting distributed 45-degree configuration of the 865-100 — two 865-100 elbows with a connecting 10" IPS pipe section between them achieving a total 45-degree direction change — provides an analogous hydraulic minor loss advantage over the single-body 857-100 45-degree elbow at 45-degree routing change locations where the routing corridor accommodates the two-fitting footprint. At primary main routing locations where the layout requires exactly 45 degrees of total direction change and the available routing space accommodates the longer two-fitting footprint, the two-fitting 22.5-degree distributed configuration achieves the total 45-degree direction change with lower combined minor loss and smaller per-fitting resultant thrust force (~0.390 × P × A at each 22.5-degree bend versus ~0.765 × P × A at the single 857-100 45-degree bend) than the single-body 857-100. The two individual thrust block events in the two-fitting configuration are each engineered from the 22.5-degree resultant force formula and are each smaller than the single-body 857-100's thrust block event, distributing the civil construction scope across two modest engineering elements rather than one larger one. The hydraulic advantage of the two-fitting 22.5-degree configuration over the single 857-100 is smaller in absolute magnitude than the four-fitting 22.5-degree configuration's advantage over the single 856-100, because the total minor loss differential between two sequential 22.5-degree bends and one 45-degree bend is a fraction of the differential between four sequential 22.5-degree bends and one 90-degree bend — but in large-diameter 10" Schedule 80 primary main hydraulic analyses where every component of the minor loss budget is evaluated, the incremental advantage of the two-fitting configuration at 45-degree routing change locations contributes to the primary main's available hydraulic head margin and is worth evaluating in the project's hydraulic model at 45-degree direction-change locations where routing space accommodates the two-fitting geometry.

The three most important specification comparisons at the 865-100 are each governed by a distinct selection criterion and must each be resolved before any direction-change fitting is purchased at a 10" Schedule 80 primary main bend location. The first and most important comparison is the 22.5-degree elbow versus 45-degree elbow versus 90-degree elbow selection — the selection among the 865-100, the 857-100 (10" Schedule 80 PVC 45-degree elbow, Spears 857 series), and the 856-100 (10" Schedule 80 PVC 90-degree elbow, Spears 856 series) — a three-way comparison with distinct decision frameworks depending on the application context. In the single-body direction change context — where a single fitting body must execute the complete direction change at a bend location — the selection is determined entirely by the piping layout drawing's specified direction-change angle: the 856-100 is correct where the layout requires exactly 90 degrees at a single body; the 857-100 is correct where the layout requires exactly 45 degrees; and the 865-100 is correct where the layout requires exactly 22.5 degrees. In the distributed 90-degree configuration context — where the total required direction change is 90 degrees and the designer is evaluating single-body versus multi-fitting configurations — the selection is governed by the available routing corridor length, the hydraulic minor loss budget, and the thrust restraint engineering preference across three competing configurations: the single-body 856-100 where corridor length is constrained and compact geometry is required; the two-fitting 857-100 where corridor length accommodates the two-fitting footprint and the hydraulic design favors the 45-degree distributed geometry; and the four-fitting 865-100 where corridor length accommodates the substantially longer four-fitting footprint and the hydraulic design requires the maximum minor loss reduction available in the standard 10" Schedule 80 PVC elbow fitting ecosystem. The selection among these three configurations for a 90-degree direction change at any specific primary main routing location requires explicit evaluation of the available corridor length, the primary main's hydraulic head budget at the design flow, and the civil thrust block engineering preference at the routing location — no single configuration is universally preferred across all 90-degree bend locations in a 10" Schedule 80 primary main project, and the project BOM may appropriately specify different configurations at different 90-degree bend locations based on site-specific spatial and hydraulic conditions.

In the distributed 45-degree configuration context — where the total required direction change is 45 degrees and the designer is evaluating single-body versus distributed configurations — the selection is governed by the available corridor length and the hydraulic minor loss budget: the single-body 857-100 where corridor length is constrained; the two-fitting 865-100 distributed configuration where corridor length accommodates the two-fitting footprint and the hydraulic design favors the incremental minor loss reduction of the distributed 22.5-degree geometry. At large-diameter 10" Schedule 80 primary main projects where the hydraulic design is tight and every minor loss reduction is evaluated, the two-fitting 865-100 distributed 45-degree configuration is the correct hydraulic efficiency specification at corridor-length-permitting 45-degree bend locations — the single-body 857-100 is the correct spatial efficiency specification where corridor length is constrained. The designer must evaluate each 45-degree routing change location individually from the available corridor length and the hydraulic model's sensitivity to minor loss at that specific bend location.

The second critical comparison is the Schedule 80 versus Schedule 40 selection at the 10" 22.5-degree elbow — between the 865-100 (Schedule 80 gray PVC, ASTM D2467) and any Schedule 40 counterpart at the 10" 22.5-degree elbow configuration. This selection follows the schedule determination framework established across every Schedule 80 PVC fitting page in this catalog: Schedule 80 is the correct specification wherever Schedule 80 is the system-wide material standard at the 10" primary main level, wherever the primary main's operating pressure, surge transient at the bend location, and engineering safety margin requirements mandate Schedule 80 wall thickness at the primary main direction-change fitting location, wherever gray material class identification is required for inspection and maintenance throughout the primary main fitting inventory, and wherever the 856-100 and 857-100 at the same primary main service level are already specified in Schedule 80 — confirming that the 865-100 must match the Schedule 80 material class of the other direction-change fittings in the same Schedule 80 primary main fitting system. The 865-100's Schedule 80 construction provides the pressure rating, wall thickness, and gray material class identification appropriate for large-diameter primary main 22.5-degree direction-change fitting service within the Schedule 80 envelope. At 10" primary main routing locations where surge transient pressure at the bend is material — as at every buried direction-change fitting in a 10" primary transmission or distribution main — the surge transient pressure must be confirmed within the Schedule 80 pressure ceiling rather than only the steady-state operating pressure; Schedule 80's higher pressure ceiling relative to Schedule 40 at the 10" fitting size provides additional surge margin at the primary main direction-change fitting locations that Schedule 40 cannot match.

The third critical comparison is the manufactured elbow versus field-fabricated mitered bend — the selection between the 865-100 and a field-fabricated direction change constructed from oblique-cut pipe sections joined at 22.5-degree oblique angles. The 865-100 is a factory-manufactured fitting with a smooth manufactured elbow geometry providing a continuous, rated, NSF-listed, ASTM D2467-compliant flow path at the 22.5-degree direction change — with no oblique cut pipe joints in the primary flow path at the bend and a manufacturer-rated pressure performance confirmed at the 10" 22.5-degree elbow geometry by the fitting's ASTM D2467 compliance. A field-fabricated 22.5-degree mitered bend introduces oblique cut joints whose pressure performance and joint geometry are governed by field fabrication quality rather than manufacturer certification, is not covered by the manufactured fitting's ASTM D2467 rating and NSF listing at the mitered joint locations, and creates multiple potential failure points in the primary main's flow path at the bend. In municipal water distribution, potable water treatment, and all primary main system specifications requiring NSF-listed, ASTM D2467-compliant fittings at all direction-change locations, the 865-100 manufactured elbow is the only compliant fitting at 10" Schedule 80 primary main 22.5-degree direction-change locations. Verify whether the project specification and authority having jurisdiction require manufactured fittings at all direction-change locations before any field-fabricated alternative is considered at any 10" Schedule 80 primary main bend location.

The assembly requirements at the 865-100 reflect the two equal large-diameter socket connections at the 10" IPS fitting size, the critical importance of outlet socket angular orientation confirmation before cement application — the assembly consideration established across all elbow fitting pages in this catalog — and the additional orientation planning complexity of multi-fitting compound configurations where the outlet orientation of each sequential 865-100 must be confirmed through the entire assembly chain before cement is applied at any socket. Both socket connections require the full large-diameter Schedule 80 PVC assembly discipline at the 10" IPS fitting size — pre-planned assembly with both 10" pipe ends fully positioned and the outlet socket's angular orientation confirmed against the piping layout drawing by dry-fit before cement is applied at either socket, complete circumferential heavy-body cement coverage at both 10" bonding surfaces within the available working time at the 10" IPS large-diameter bonding surface, and full cure time compliance before any system pressurization. At the 22.5-degree elbow's shallow bend geometry, the outlet socket's departure direction is offset by only 22.5 degrees from the inlet socket's receiving direction — a relatively subtle angular deviation that can be difficult to confirm visually during dry-fit without reference marks on both the elbow body and the adjacent pipe section. The reference mark dry-fit discipline is therefore more critical at the 865-100 than at the 856-100 or 857-100 — the smaller angular offset makes undetected orientation errors more likely without explicit reference mark confirmation, and any angular error in the outlet socket orientation at cement application produces a permanent routing misalignment that is more difficult to identify as a 22.5-degree error (versus an obvious 90-degree or 45-degree misalignment) but equally permanent and equally consequential for the downstream pipe routing alignment. Apply reference marks on both the elbow body and the adjacent pipe sections at both socket faces during dry-fit, confirm the 22.5-degree outlet departure direction from the piping layout drawing's upstream routing axis and the confirmed downstream routing direction at each individual 865-100 fitting body, and apply cement only after both the departure plane orientation and the rotational orientation about the inlet pipe axis are confirmed and reference-marked.

In the four-fitting distributed 90-degree configuration, the outlet socket orientation of each of the four 865-100 elbows must be confirmed in a four-step sequential chain: the first 865-100's outlet socket orientation establishes the routing direction of the first connecting pipe section; the second 865-100's inlet and outlet socket orientations must align with the first connecting section's routing direction and establish the routing direction of the second connecting pipe section; the third 865-100's inlet and outlet must continue the sequential progression; and the fourth 865-100's outlet establishes the final downstream routing direction that must match the piping layout drawing's confirmed downstream routing direction after the complete 90-degree direction change. Each of the four outlet socket orientations must be confirmed from the sequential chain — not independently — because each 865-100's inlet direction is established by the upstream fitting's outlet direction, and the accumulated angular offset must reach exactly 90 degrees at the fourth 865-100's outlet. Dry-fit the complete four-fitting assembly — all four 865-100 bodies, all four connecting pipe sections, and the upstream and downstream 10" pipe continuations — against the piping layout drawing's specified upstream and downstream routing directions before applying cement at any of the eight socket connections in the four-fitting assembly. Apply reference marks at all eight socket faces during dry-fit. Plan the cement application sequence to prevent any joint from being disturbed during adjacent joint assembly, and allow each joint to achieve its initial set before the adjacent joint's cement is applied where the geometry of the assembly permits sequential staging. Full cure time compliance before any system pressurization at any socket connection in the four-fitting assembly.

The 10" IPS bonding surface at the 865-100 is at the large-diameter Schedule 80 PVC socket assembly scale requiring the same attentive working time management, pre-planned assembly staging, and complete circumferential coverage discipline established at every 10" Schedule 80 PVC socket fitting in this catalog. Apply complete circumferential heavy-body cement coverage at both 10" socket bonding surfaces within the available working time for large-diameter 10" IPS Schedule 80 PVC socket assembly, insert both pipe ends to full socket depth with a slight rotation to distribute the cement uniformly at the bonding surface, hold in position for the required joint set time, and comply fully with cure time requirements before any system pressurization at either socket connection. Deburr and bevel both 10" pipe ends before cementing to ensure consistent insertion depths and complete circumferential bond lines at both socket connections.

The thrust block engineering at buried 865-100 installation locations applies the 22.5-degree bend resultant force formula — 2 × P × A × sin(11.25°) ≈ 0.390 × P × A — to establish the required thrust block bearing area at each individual buried 865-100 installation. The resultant thrust force acts at 11.25 degrees outward from the bend corner in the plane of the bend — bisecting the angle between the upstream and downstream pipe axes, nearly aligned with both pipe axes — and the thrust block bearing surface must be oriented perpendicular to this 11.25-degree resultant force direction. The nearly-inline direction of the 865-100's resultant thrust force — at only 11.25 degrees from both the upstream and downstream pipe axes — means the thrust block bearing face is oriented nearly perpendicular to the primary main's routing axis, bearing primarily against the trench wall's cross-sectional face at the bend location in the nearly-inline direction rather than against the trench wall in the clearly transverse direction that the 856-100's thrust block bears. The primary system engineer must confirm that undisturbed soil is available in the 11.25-degree resultant force bearing direction at each buried 865-100 installation — confirming that the nearly-inline bearing vector points toward undisturbed trench wall material in the routing direction beyond the fitting body — and that the thrust block bearing face can be constructed with adequate bearing area perpendicular to the 11.25-degree resultant in the available trench geometry. At buried installations in granular or cohesive soils with adequate bearing capacity in the nearly-inline direction, the 865-100's small resultant force magnitude and its nearly-inline bearing direction produce a relatively compact thrust block — but the engineering confirmation must be performed explicitly for each installation rather than assumed from the fitting's reduced thrust force magnitude alone. At the four-fitting distributed 90-degree configuration, four independent thrust block engineering events must be designed and constructed — one at each 865-100 fitting body, each with the resultant force direction established from the upstream and downstream routing directions at that individual bend, each independently calculated from the 22.5-degree resultant force formula and the site-specific soil bearing capacity — with the resultant force directions at the first, second, third, and fourth individual 865-100 bends all pointing in different compass directions as the primary main's routing progressively turns through the cumulative 90-degree direction change sequence. Thrust block construction drawings prepared and signed by the primary system engineer are required at every buried 865-100 installation in public water distribution systems and at all primary main installations regulated by the authority having jurisdiction's standard specifications for water main construction.

At buried installations where undisturbed soil bearing capacity in the 11.25-degree resultant force bearing direction is insufficient for standard thrust block construction — in soft soils, saturated soils, disturbed soils, or routing geometries where the nearly-inline bearing direction does not reach undisturbed trench wall material within the trench geometry — the primary system engineer must specify alternative thrust restraint methods consistent with AWWA M23, AWWA C600, or the engineer of record's project-specific thrust restraint design standard for the 22.5-degree bend geometry, including mechanical joint restraint at the elbow connections and adjacent pipe joints, restrained joint pipe systems at the bend location, or augmented thrust block construction designed for the nearly-inline bearing direction geometry at the bend.

The 865-100's application at vertical grade transition locations — where the 10" Schedule 80 primary main transitions between buried horizontal runs at different elevations — is a commercially significant single-fitting application role where the 22.5-degree direction change's gentle angle accommodates grade transitions more smoothly than any larger standard elbow angle. At terrain grade changes along a 10" Schedule 80 primary transmission main route where the primary main must descend or ascend between horizontal routing segments at different burial elevations, the 865-100's 22.5-degree vertical deflection provides the gentlest single-fitting grade transition available in the standard 10" Schedule 80 PVC elbow fitting range — requiring the least vertical head loss from elevation change geometry between the two horizontal routing segments' invert elevations. At grade transitions where the total required vertical deflection between horizontal segments is 22.5 degrees, the 865-100 is correct as a single fitting; where the total vertical deflection is 45 degrees, two 865-100 elbows in vertical orientation with a connecting pipe section provide the most gradual distributed approach; where the total vertical deflection is 90 degrees — as at primary main transitions from buried horizontal runs to vertical risers — four 865-100 elbows in vertical sequence provide the most gradual distributed approach, though the four-fitting vertical assembly's extended vertical footprint must be confirmed against the available burial depth and vertical routing space at the grade transition location.

The 865-100 also serves routing adjustment applications in the 10" Schedule 80 PVC primary main system where minor horizontal routing offsets require a small angular deflection — routing adjustments to avoid recently discovered underground utilities or buried structures not identified in the original piping layout drawing, minor routing corrections to maintain required horizontal clearances from adjacent buried infrastructure, and small-angle routing deviations to accommodate as-built field conditions at transmission main construction locations where the actual field conditions differ slightly from the design drawing's assumed routing corridor. At single-fitting routing adjustment locations where the required routing offset corresponds to approximately 22.5 degrees, the 865-100 provides the manufactured fitting body for the routing correction without field fabrication — maintaining the primary main's NSF-listed, ASTM D2467-compliant, Schedule 80 gray PVC construction through the routing adjustment point.

Schedule 80 gray PVC construction provides the chemical resistance, NSF certification, and structural capability appropriate for large-diameter primary main 22.5-degree direction-change fitting service within the Schedule 80 pressure and wall thickness envelope. PVC Type 1 Grade 1 construction with cell classification 12454 per ASTM D1784 delivers broad chemical resistance across water treatment chemicals, process water service, industrial utility water, and the full range of non-solvent process fluids appropriate for Schedule 80 PVC primary main service at both socket connections. The gray color provides the permanent, inspectable Schedule 80 material class identification at the primary main direction-change fitting location — confirming the installed material class for inspectors, maintenance engineers, and facility managers at every 22.5-degree bend in the 10" Schedule 80 primary main routing. Both sockets accept both Schedule 40 and Schedule 80 10" IPS PVC pipe — the schedule of the connecting pipe sections at both the inlet and outlet of the 865-100 must be consistent with the system-wide Schedule 80 specification throughout the primary main's pipe and fitting inventory.

NSF 61 certification lists this fitting for potable water contact, and NSF 14 covers compliance with applicable plastics piping material standards — making it the correct Schedule 80 PVC 22.5-degree direction-change elbow for municipal water distribution systems, large potable water pump station primary headers, large commercial irrigation primary mains, and large commercial and institutional water supply primary mains where NSF-listed, Schedule 80 fittings are required at every direction-change location in the primary distribution system. ASTM D2467 governs Schedule 80 PVC socket fittings and defines the manufacturing, dimensional, and pressure performance requirements the 865-100 is produced to. Verify manufacturer pressure rating documentation for the specific fitting configuration before final system specification — at the 10" 22.5-degree elbow configuration, the governing pressure rating must be confirmed against the manufacturer's published pressure-temperature rating table for SKU 865-100 before installation in systems at or near the fitting's rated pressure ceiling; the surge transient pressure at the 10" primary main bend location must be confirmed within the Schedule 80 pressure ceiling.

Key Features:

• Schedule 80 gray PVC 22.5-degree elbow — 10" slip socket x 10" slip socket, both ends equal 10" IPS; Spears 865 series Schedule 80 PVC socket elbows
• Gentlest standard elbow angle in the 10" Schedule 80 PVC socket fitting ecosystem — 22.5-degree direction change; lowest hydraulic minor loss coefficient per fitting body; smallest resultant thrust force per fitting body (~0.390 × P × A) of any standard elbow angle; resultant force directed at 11.25 degrees outward from bend corner — bisecting upstream and downstream pipe axes at 11.25 degrees from each
• Resultant thrust force comparison across standard elbow angles at same pressure and pipe size — 865-100 at 22.5°: ~0.390 × P × A (100% reference); 857-100 at 45°: ~0.765 × P × A (~196% of 865-100); 856-100 at 90°: ~1.414 × P × A (~362% of 865-100); the 865-100 produces approximately 28% of the 856-100's resultant thrust force and approximately 51% of the 857-100's resultant thrust force at the same operating pressure and pipe cross-sectional area
• Three distinct commercial application roles — (1) Single-body 22.5-degree turn: correct wherever layout requires exactly 22.5 degrees at a single fitting body including grade transitions, minor routing offsets, and compound angle components; (2) Two-fitting distributed 45-degree configuration: two 865-100 elbows with connecting 10" IPS pipe section — lower combined minor loss and smaller per-fitting thrust force than single 857-100; (3) Four-fitting distributed 90-degree configuration: four 865-100 elbows with connecting pipe sections — the lowest-minor-loss, smallest-per-fitting-thrust-force 90-degree direction change configuration in the 10" Schedule 80 PVC socket fitting ecosystem; preferred at routing corridor-permitting 90-degree bend locations where hydraulic efficiency and thrust restraint scope reduction are priorities
• Four-fitting distributed 90-degree configuration — total footprint minimum approximately 15 to 30+ feet between first inlet socket and fourth outlet socket at 10" IPS scale (four fitting bodies + three connecting sections, each minimum ~4 to 8 feet / ~5 to 10 pipe diameters); four independent thrust block engineering events, each at ~0.390 × P × A resultant; four sequential outlet socket orientations confirmed in chain before cement at any socket; viable only where routing corridor accommodates extended multi-fitting footprint
• Two-fitting distributed 45-degree configuration — minimum approximately one fitting body length plus one connecting section (~4 to 8 feet minimum) between two 865-100 elbows; two independent thrust block engineering events, each at ~0.390 × P × A; two sequential outlet socket orientations confirmed in chain before cement; preferred over single 857-100 where corridor accommodates two-fitting footprint and hydraulic design values incremental minor loss reduction
• First critical comparison — 22.5-degree vs. 45-degree vs. 90-degree elbow: single-body context determined by piping layout's specified direction-change angle; distributed 90-degree context: four-fitting 865-100 (maximum minor loss reduction, smallest per-fitting thrust, longest footprint) vs. two-fitting 857-100 (intermediate minor loss, intermediate thrust, intermediate footprint) vs. single 856-100 (highest minor loss, largest single-event thrust, minimum footprint); selection requires explicit hydraulic model evaluation and corridor length confirmation at each individual bend location — no universal configuration preference across all 90-degree bends in a 10" Schedule 80 primary main BOM
• Second critical comparison — Schedule 80 versus Schedule 40: 865-100 (Schedule 80 gray PVC, ASTM D2467) where system-wide Schedule 80 standard, operating pressure, surge transient at bend, safety margin, or gray material class identification mandate Schedule 80 at 10" direction-change fitting locations; Schedule 80's higher pressure ceiling than Schedule 40 at 10" fitting size provides additional surge margin at primary main bend locations; 865-100 must match Schedule 80 material class of 856-100 and 857-100 in the same Schedule 80 primary main system
• Third critical comparison — manufactured elbow versus field-fabricated mitered bend: 865-100 provides ASTM D2467-compliant, NSF-listed, manufacturer-rated 22.5-degree direction change; field fabrication not compliant with NSF-listed manufactured fitting requirements in municipal and regulated primary main system specifications; 865-100 is the only compliant fitting at 10" Schedule 80 primary main 22.5-degree bend locations
• Thrust block bearing direction — nearly inline with primary main routing axis; resultant force at 11.25 degrees from both pipe axes requires bearing surface nearly perpendicular to routing axis; confirm undisturbed soil available in the 11.25-degree nearly-inline bearing direction at each buried installation; in four-fitting configuration, four thrust blocks with four different resultant force bearing directions as routing progressively turns through cumulative 90-degree sequence — each designed and constructed independently
• Reference mark dry-fit discipline more critical than at larger elbow angles — 22.5-degree outlet offset is subtle and visually difficult to confirm without reference marks; angular orientation errors more likely without explicit reference marks at dry-fit; outlet orientation confirmed in two planes (departure plane and rotational orientation about inlet pipe axis) at each individual 865-100 body; in multi-fitting configurations, sequential outlet orientation chain confirmed through all fitting bodies before cement at any socket
• Mandatory engineered thrust block at every buried installation — no simplification, omission, or proportional assumption from smaller elbow or adjacent fitting thrust block designs; thrust block bearing area calculated from 0.390 × P × A resultant force formula, 10" IPS cross-sectional area, full operating pressure including surge transient, site-specific soil bearing capacity, and 11.25-degree resultant force direction at each individual burial location
• Vertical grade transition application — 22.5-degree vertical deflection accommodates gentle terrain grade transitions; most gradual single-fitting vertical deflection available in 10" Schedule 80 PVC elbow range; two 865-100 in vertical sequence for 45-degree grade transitions; four in vertical sequence for 90-degree horizontal-to-riser transitions where vertical routing space accommodates four-fitting footprint
• Both 10" socket connections require full large-diameter heavy-body cement assembly discipline — pre-planned assembly with pipe ends positioned and outlet orientation confirmed by dry-fit before cement; complete circumferential heavy-body cement coverage within available working time at large-diameter 10" IPS Schedule 80 bonding surface; full cure time compliance before pressurization; in multi-fitting configurations, plan complete assembly sequence for all sockets before cement begins at any socket
• Both sockets compatible with Schedule 40 and Schedule 80 IPS 10" pipe — connecting pipe section schedule consistent with system-wide Schedule 80 specification throughout primary main pipe and fitting inventory
• Manufactured to ASTM D2467 — governing standard for Schedule 80 PVC socket fittings
• NSF 61 certified for potable water contact; NSF 14 listed
• Gray color — Schedule 80 material class identification at primary main direction-change fitting locations consistent with all Schedule 80 fittings in the system
• Cell classification PVC 12454 per ASTM D1784
• Heavy-body solvent cement required at both socket connections; full cure time compliance mandatory before pressurization
• Pressure rating: verify against manufacturer pressure-temperature table for SKU 865-100; confirm surge transient at bend location within rated ceiling

Specifications:

Industries & Applications:

• Municipal Water Distribution — Single 22.5-Degree Direction Changes, Distributed Two-Fitting 45-Degree Configurations, Four-Fitting Distributed 90-Degree Configurations, and Grade Transition Bends at Primary Transmission and Distribution Main Routing Changes on 10" Schedule 80 Primary Mains — The 10" Schedule 80 PVC 22.5-degree elbow is specified at direction-change locations on 10" municipal water transmission and primary distribution mains in Schedule 80 PVC systems across all three application roles — single-body 22.5-degree turns, two-fitting distributed 45-degree assemblies, and four-fitting distributed 90-degree assemblies — with the four-fitting distributed 90-degree configuration representing the most commercially significant application at major 90-degree transmission main routing turns where the primary main's hydraulic design benefits from the maximum minor loss reduction available in the 10" Schedule 80 PVC elbow fitting range; primary transmission main four-fitting distributed 90-degree routing turns at municipal right-of-way intersections where the available routing corridor along the transmission main's approach to and departure from the intersection accommodates the minimum approximately 15-to-30-foot four-fitting assembly footprint — the most hydraulically preferred 90-degree direction-change configuration in the 10" Schedule 80 transmission main BOM at corridor-length-permitting intersection routing turns where the primary system hydraulic model confirms the minor loss reduction from the four-fitting 22.5-degree configuration contributes to maintaining required delivery pressure at remote service points; primary distribution main distributed 90-degree turns at distribution system layout corners where the pipeline route through open right-of-way, large-parcel property, or extended distribution corridor provides adequate corridor length for the four-fitting footprint; primary transmission main single 22.5-degree routing adjustments at as-built field condition offsets where the required routing correction corresponds to approximately 22.5 degrees — routing adjustments around recently discovered underground utilities, buried structures not identified in the original design, or field clearance requirements at crossings of adjacent buried infrastructure; primary transmission main two-fitting distributed 45-degree routing changes at routing corridor locations where the total required direction change is 45 degrees and the available corridor length accommodates the two-fitting footprint with reduced minor loss relative to the single 857-100; primary transmission main vertical grade transitions where the 865-100 provides single-body 22.5-degree vertical deflection at gentle terrain grade changes, with two or four sequential 865-100 elbows in vertical orientation providing distributed 45-degree or 90-degree vertical transitions at more significant terrain grade changes where routing depth permits the vertical multi-fitting assembly; pump station primary header 22.5-degree direction changes where the pump station vault geometry accommodates single-body 22.5-degree routing corrections at header turns where the full 45-degree or 90-degree fitting geometry cannot be accommodated within the vault's confined dimensions; NSF 61 listing confirms potable water fitness at every municipal water distribution 10" Schedule 80 primary main direction-change installation; engineered thrust block required at every buried installation — thrust block bearing area calculated from 0.390 × P × A resultant and 11.25-degree bearing direction; four independent thrust block engineering events in four-fitting configuration; surge transient pressure at 10" primary main bend confirmed within Schedule 80 pressure ceiling
• Water Treatment Plant — Single 22.5-Degree Turns, Distributed 45-Degree Configurations, and Four-Fitting Distributed 90-Degree Configurations at Primary Header Routing Changes, Gallery Header Turns, and Pump Station Header Routing in 10" Schedule 80 Primary Distribution Headers — Installed at direction-change locations on 10" Schedule 80 primary distribution headers in municipal and industrial water treatment plants across all three 865-100 application roles — filter gallery primary header four-fitting distributed 90-degree turns where the gallery header routing corridor along the gallery structure's length accommodates the four-fitting assembly footprint and the gallery hydraulic distribution design benefits from the maximum minor loss reduction at major 90-degree header routing turns within the gallery; filter gallery primary header two-fitting distributed 45-degree turns where the gallery header requires 45-degree direction changes and the corridor accommodates the two-fitting footprint; plant service water primary header single 22.5-degree routing corrections and grade transitions where the 10" service water header requires gentle direction changes at facility structure boundary routing corrections; clearwell and distribution header 22.5-degree and distributed direction changes at clearwell structure perimeter routing adjustments and distribution manifold routing corrections; primary chemical distribution header 22.5-degree routing corrections at chemical building perimeter routing adjustments; backwash supply primary header direction changes where the 10" backwash supply header changes direction at pump station structure boundaries and gallery entry routing; and pump station primary header 22.5-degree routing corrections within pump station vault and header bay routing where the vault geometry accommodates the gentlest fitting body geometry available — the 865-100's single-body compact turn — at header routing corrections where neither the 857-100 nor the 856-100 can be accommodated within the vault's dimensional constraints; NSF 61 listing confirms potable water fitness at every water treatment plant primary header direction-change installation
• Pump Station — Single 22.5-Degree Header Routing Corrections, Grade Transitions at Vault Entry and Departure Points, and Distributed Multi-Fitting Configurations in Extended Header Bay Layouts on 10" Schedule 80 Primary Headers — Used at direction-change locations in 10" Schedule 80 primary pump station header routing across all three 865-100 application roles — pump station primary discharge header single 22.5-degree routing corrections at pump bay header routing adjustments where the vault geometry requires a gentle direction change between pump discharge flanges and the primary discharge main departure — the application at which the 865-100's gentlest-standard-angle character is most practically valued in the pump station context, providing the minimum-footprint direction correction at routing adjustment locations within the vault where neither a 45-degree nor a 90-degree fitting would align the header correctly with the primary discharge main departure orientation; pump station primary discharge header grade transition turns where the 10" discharge main transitions between the pump station's underground vault elevation and the surface at a 22.5-degree vertical deflection angle — at pump stations where the primary discharge main's departure alignment makes the 22.5-degree vertical transition the correct design angle rather than a larger standard bend; pump station primary header four-fitting distributed 90-degree turns where the pump station header bay's extended layout length accommodates the multi-fitting assembly footprint at major 90-degree header routing turns and the pump station's hydraulic design values minor loss reduction in the primary header's total dynamic head budget; pump station primary suction header 22.5-degree and distributed direction changes within the suction manifold routing; and pump station primary discharge main departure bends where the 10" primary discharge main requires a 22.5-degree direction correction between the pump station's header departure orientation and the transmission main's downstream routing direction at the pump station's primary main departure point; at pump stations where primary headers operate at full system pressure including shut-off head and surge, the 865-100's Schedule 80 construction provides the pressure rating and gray material class identification appropriate for pump station primary header direction-change fitting service; Schedule 80 pressure ceiling confirmation must include shut-off head and surge transient at each 865-100 installation location
• Large Commercial & Agricultural Irrigation — Single 22.5-Degree Turns, Two-Fitting Distributed 45-Degree Configurations, Four-Fitting Distributed 90-Degree Configurations, and Grade Transition Bends on 10" Schedule 80 Primary Transmission Mains at Major Golf Course, Resort, Regional Agricultural, and Large Commercial Campus Irrigation Systems — Specified at direction-change locations on 10" Schedule 80 primary irrigation transmission mains at large golf course and resort irrigation systems, large-acreage agricultural operations, and regional landscape irrigation projects where all three 865-100 application roles appear in the primary transmission main BOM — primary transmission main four-fitting distributed 90-degree turns at property boundary corners, irrigation district right-of-way intersections, and field layout 90-degree routing corners where the open agricultural or resort property terrain provides extended routing corridor length for the four-fitting assembly footprint, and where the primary transmission main's hydraulic design — serving large distribution areas over long transmission distances — benefits most from the maximum minor loss reduction at major 90-degree routing turns to maintain required delivery pressure at remote zone supply points across the full transmission main route; primary transmission main two-fitting distributed 45-degree turns at 45-degree routing corners and routing adjustments where the available corridor accommodates the two-fitting footprint; primary transmission main single 22.5-degree routing adjustments at as-built field condition offsets, underground obstruction avoidances, and minor routing corrections along the extended transmission main route; primary transmission main vertical grade transitions where the 865-100 provides 22.5-degree vertical deflection at gentle terrain grade changes along the transmission main's extended route — particularly relevant at large agricultural transmission main routes traversing rolling terrain where multiple gentle grade transitions along the route collectively produce a meaningful cumulative vertical routing offset; irrigation pump station primary discharge main grade transitions and routing corrections where the 10" primary discharge main requires 22.5-degree direction corrections at the pump station departure; the 865-100 appears in large commercial irrigation primary transmission main BOMs alongside the 856-100 and 857-100 — the 856-100 at constrained-corridor 90-degree turns, the 857-100 distributed configuration at intermediate-corridor 90-degree turns and single 45-degree turns, and the four-fitting 865-100 at open-corridor 90-degree turns where the maximum hydraulic efficiency of the distributed 22.5-degree configuration is valued
• Industrial Process Piping — Single 22.5-Degree Routing Corrections, Grade Transitions, and Multi-Fitting Distributed Configurations at Primary Process Header Routing Changes, Pipe Rack Direction Changes, and Underground Header Distribution Turns on 10" Schedule 80 Primary Headers — Used at direction-change locations on 10" Schedule 80 process water primary headers, cooling water primary distribution trunks, and plant utility water primary mains in manufacturing plants, chemical processing facilities, petrochemical support facilities, and heavy industrial environments where all three 865-100 application roles apply — process water primary header single 22.5-degree routing corrections at process building structural boundary routing adjustments and pipe rack routing corrections where the primary header's installed position requires a gentle direction correction not accommodated by the 45-degree or 90-degree standard elbow angles; cooling water primary distribution trunk four-fitting distributed 90-degree turns where the pipe rack layout or underground header corridor provides extended routing length for the four-fitting assembly footprint and the cooling system's hydraulic design values minor loss reduction at major header routing turns; plant utility water primary main two-fitting distributed 45-degree turns at 45-degree routing corridor changes where corridor accommodates the two-fitting footprint; primary process header vertical grade transitions where the 10" primary header transitions between underground distribution elevations and above-grade pipe rack elevations at 22.5-degree grade transitions; facility fire protection primary supply main 22.5-degree and distributed direction changes at facility perimeter routing corrections and fire protection ring main routing adjustments; and process piping rack primary header distributed 90-degree turns where the pipe rack's extended straight-run length accommodates the four-fitting assembly footprint between pipe rack structural bays; Schedule 80 gray PVC construction provides the system-wide material standard identification, pressure rating, and gray material class identification appropriate for primary process header direction-change fitting service in industrial process piping systems where Schedule 80 is the system material standard
• Municipal Well Field — Single 22.5-Degree Routing Corrections, Grade Transitions, and Distributed Multi-Fitting Configurations at Primary Collection and Distribution Header Routing Changes and Pump Station Header Turns on 10" Schedule 80 Primary Headers — Installed at direction-change locations on 10" Schedule 80 primary well field collection and distribution headers where all three 865-100 application roles apply — primary distribution header single 22.5-degree routing corrections at well field layout boundary routing adjustments and distribution corridor routing corrections where the 10" primary distribution header requires a gentle direction change; primary distribution header four-fitting distributed 90-degree turns at well field grid layout 90-degree corners where the open well field distribution corridor provides extended routing length for the four-fitting assembly footprint and the well field's primary distribution hydraulic design benefits from minor loss reduction at major header routing turns; primary distribution header two-fitting distributed 45-degree turns at 45-degree routing corridor changes; pump station primary header 22.5-degree direction corrections and grade transitions within well field pump stations; and primary distribution header vertical grade transitions at terrain grade changes along the well field distribution route; at well field primary headers where pump operating pressures including shut-off head and surge must be confirmed within the Schedule 80 pressure ceiling, the 865-100's Schedule 80 construction is mandatory at all primary header direction-change locations in the 10" Schedule 80 well field distribution system; NSF 61 listing confirms potable water fitness at every 22.5-degree direction-change installation
• Water & Wastewater Treatment — Single 22.5-Degree Routing Corrections, Grade Transitions, and Distributed Multi-Fitting Configurations at Primary Process Header Routing Changes, Treatment Basin Distribution Header Turns, and Process Equipment Connection Header Routing on 10" Schedule 80 Primary Process Headers — Specified at direction-change locations on 10" Schedule 80 primary process distribution headers in industrial wastewater treatment, water reclamation, and large-scale industrial water management facilities — primary influent header single 22.5-degree routing corrections at treatment basin perimeter routing adjustments and influent distribution manifold routing corrections where gentle direction corrections are required in the primary influent distribution routing; primary effluent distribution header four-fitting distributed 90-degree turns where the effluent distribution header's routing corridor along the treatment facility accommodates the four-fitting assembly footprint and the distribution hydraulic design values minor loss reduction at major header routing turns; aeration system primary supply header 22.5-degree and distributed direction changes at basin perimeter routing adjustments; primary chemical distribution header 22.5-degree routing corrections at chemical building perimeter routing adjustments; primary process distribution header vertical grade transitions where the 10" primary header transitions between underground distribution routing and above-grade process equipment connection elevations at 22.5-degree grade transition angles; and primary process header two-fitting distributed 45-degree turns at process basin layout routing changes where the corridor accommodates the two-fitting geometry; NSF 61 listing confirms fitness for every direction-change installation in the primary treatment distribution system
• HVAC & Large Commercial Mechanical Systems — Single 22.5-Degree Routing Corrections, Grade Transitions, and Distributed Multi-Fitting Configurations at Primary Distribution Main Routing Changes, Campus Underground Header Direction Changes, and Equipment Room Header Turns on 10" Schedule 80 Primary Distribution Mains — Used at direction-change locations on 10" Schedule 80 primary chilled water distribution mains, condenser water primary trunks, and large-capacity hydronic primary distribution mains in large commercial campus, institutional, and industrial mechanical systems — campus primary chilled water distribution main four-fitting distributed 90-degree turns at campus roadway intersections and campus infrastructure corridor routing turns where the underground distribution main's routing corridor provides extended routing length for the four-fitting assembly footprint and the campus chilled water system's hydraulic design values minor loss reduction at major distribution main routing turns to maintain required delivery pressure at remote campus buildings; campus primary chilled water distribution main two-fitting distributed 45-degree turns at 45-degree campus corridor routing changes where corridor accommodates the two-fitting footprint; primary distribution main single 22.5-degree routing corrections at as-built underground infrastructure avoidance points and campus routing adjustments; primary condenser water distribution trunk 22.5-degree and distributed direction changes at cooling tower structure perimeter routing corrections; primary distribution main campus building entry grade transitions at 22.5-degree entry angles; and equipment room primary header 22.5-degree routing corrections within the campus central plant's mechanical room and chiller plant header bay routing where the header routing requires a gentle direction correction within the equipment room's dimensional constraints; Schedule 80 PVC construction satisfies the material specification at primary distribution main direction-change locations where Schedule 80 is the system material standard
• Aquaculture & Large-Scale Water Management Infrastructure — Installed at direction-change locations on 10" Schedule 80 primary water supply, recirculation, or distribution mains at the largest commercial aquaculture facilities, regional hatchery systems, and large recirculating aquaculture systems (RAS) where all three 865-100 application roles apply — primary recirculation main four-fitting distributed 90-degree turns at production hall structural boundary corners and recirculation loop routing turns where the production hall layout accommodates the four-fitting assembly footprint and the recirculation system's hydraulic design values minor loss reduction at major recirculation main routing turns to minimize pump head requirements and operating energy at the recirculation pump station; primary recirculation main two-fitting distributed 45-degree turns at 45-degree production hall routing corridor changes; primary recirculation main and supply main single 22.5-degree routing corrections at facility structural obstruction avoidances and production hall routing adjustments; primary supply main grade transitions where the 10" primary supply main transitions between underground routing and above-grade production hall entry elevations at 22.5-degree grade transition angles; recirculation pump station primary header 22.5-degree routing corrections within the pump station vault; and primary supply and recirculation main routing corrections at facility perimeter boundary routing adjustments; Schedule 80 PVC handles continuous water contact, treatment chemical exposure, and primary main operating pressures at direction-change fitting locations; NSF 61 listing confirms fitness for every 22.5-degree direction-change installation in the primary aquaculture supply and recirculation distribution system