1-1/2" Flange (Solid Style), Slip PVC Schedule 80 (851-015)

The 851-015 is a 1-1/2-inch Schedule 80 PVC solid style flange with a slip (socket) connection on the pipe end. Solid style construction means the flange face and fitting body are manufactured as a single integral unit — the bolt holes are fixed in position relative to the pipe bore and cannot be rotated after the fitting is installed. The slip pipe-end socket accepts standard 1-1/2-inch Schedule 80 PVC pipe for solvent weld assembly, creating a permanent, pressure-rated joint that becomes structurally integral to the pipe run once the cement fully cures.

Two related Schedule 80 PVC flange options are worth distinguishing clearly from the 851-015 to ensure the correct fitting is selected. The first is the 852-series solid style flange with an FPT (female threaded) pipe-end connection — same one-piece integral flange body and fixed bolt hole orientation as the 851-015, but with a female NPT threaded bore rather than a solvent weld socket. The 852-series is the correct choice when the pipe run terminates in a male NPT threaded connection that must remain serviceable and reconnectable at the pipe end; the 851-015 is the correct choice when the pipe run is permanently routed Schedule 80 PVC pipe that will be solvent welded directly into the flange socket. The second is the 856-series loose ring (Van Stone) flange with a spigot pipe-end connection — a two-piece design where a separate rotating ring carries the bolt holes and can be aligned after the stub end is installed. The 851-015 solid style is the correct choice when bolt hole alignment can be established precisely during installation and the one-piece construction's added rigidity and structural integrity at the flange face are preferred over the post-installation alignment flexibility of the loose ring design.

The flange face of the 851-015 is flat and smooth, dimensioned for full-face gasket seating against a mating flange, valve flange, pump flange, or equipment nozzle. The bolt hole pattern conforms to ANSI/ASME B16.5 Class 150 — the industry-standard 4-bolt configuration at 1-1/2-inch nominal size — ensuring dimensional compatibility with standard mating flanges across manufacturers and materials. Because the bolt holes are fixed in the one-piece body, their orientation relative to the pipe run axis must be established correctly during solvent weld installation. On systems where bolt hole alignment to a mating flange can be confirmed before the cement sets, this is a straightforward installation requirement. On systems where bolt hole alignment cannot be confirmed until after the pipe is routed — pre-fabricated assemblies, field installations with constrained pipe orientation — the 856-series loose ring design may be more appropriate.

Gray Schedule 80 PVC construction provides the pressure rating and chemical resistance required for industrial chemical process, water treatment, pool and spa, and utility service. The fitting is manufactured from virgin PVC compound conforming to ASTM D1784 Cell Classification 12454 and dimensioned to ASTM D2467 standards for Schedule 80 PVC socket fittings. Do not overtighten flange assembly bolts — PVC flange faces are susceptible to cracking under excessive bolt torque; follow manufacturer torque specifications for PVC flange assemblies and always use a full-face gasket.

Specifications:

Pressure rating reflects Schedule 80 PVC fitting body at 73°F water service. Assembled flange joint ratings depend on gasket material and compression, bolt torque, mating flange material, and fluid service conditions. Always use a full-face gasket with PVC flanges. Do not overtighten flange bolts — follow manufacturer torque specifications to avoid cracking the flange face. Establish correct bolt hole orientation before solvent cement sets — orientation cannot be adjusted after the joint cures.

Industries & Applications:

The 851-015 solid style slip flange is specified across industrial, chemical, and process piping wherever permanent solvent weld flanged connections are required on 1-1/2-inch Schedule 80 PVC pipe runs with defined bolt hole alignment requirements:

• Chemical Processing & Water Treatment — Permanent flanged connections on 1-1/2-inch Schedule 80 PVC chemical feed, chlorination, acid dosing, and reagent distribution lines at pump nozzles, filter vessel inlet and outlet ports, valve flanges, and treatment skid connections where the solvent weld pipe end provides a chemically inert, leak-free permanent joint and bolt hole alignment is established during installation
• Pump Connections & Equipment Flanges — Permanent solvent weld flange terminations on 1-1/2-inch Schedule 80 pump suction and discharge piping where the slip socket pipe end creates a structurally integral flange-to-pipe joint and the ANSI 150 lb bolt pattern mates directly with standard pump body flanges across manufacturers
• Swimming Pool & Spa Equipment — Permanent flanged connections on 1-1/2-inch Schedule 80 pool and spa recirculation piping at pump flange connections, filter vessel nozzles, heater inlet and outlet ports, and equipment room valve flange assemblies where Schedule 80 fittings are specified for their higher pressure ratings and the permanent solvent weld connection is appropriate for fixed equipment room piping
• Industrial Process Piping — Flanged isolation and connection points on 1-1/2-inch Schedule 80 chemical feed, reagent distribution, and process loop piping where permanent solvent weld flange terminations are preferred over threaded connections for their joint strength, chemical resistance, and absence of thread engagement surfaces susceptible to chemical attack
• Municipal Water & Wastewater Treatment — Pump skid connections, valve isolation flanges, and equipment nozzle interfaces on 1-1/2-inch treatment plant piping where ANSI 150 lb PVC slip flanges are specified for permanent pipe-to-equipment connections in corrosion-resistant chemical service
• Agricultural & Irrigation Systems — Permanent flanged connections on 1-1/2-inch Schedule 80 pressurized irrigation and pump system piping at pump flange connections, filter housing nozzles, and flow control equipment flanges where the solvent weld pipe end provides a durable, leak-resistant permanent joint in continuously pressurized field installations
• Semiconductor & Electronics Manufacturing — Ultra-pure water and chemical delivery system flanged terminations where the smooth-bore solvent weld socket, non-reactive PVC body, and permanent joint integrity of the slip flange are preferred over threaded pipe-end flanges at connection points requiring maximum cleanliness and chemical inertness