Flange (Loose Ring), Spigot PVC Schedule 80 6" (856-060FT)

The 6" PVC Schedule 80 Loose Ring Flange (856-060FT) is a two-component flanged connection assembly consisting of a solvent-weld spigot stub end and a free-rotating backing ring — engineered for large-diameter Schedule 80 PVC piping systems where bolt hole alignment flexibility, ease of assembly, and reliable flanged connection performance are primary design requirements. The spigot stub end solvent-welds permanently into a standard 6" Schedule 80 slip socket, while the loose backing ring rotates freely around the stub end flange face — allowing the bolt holes to be aligned precisely with the mating flange, valve, pump, or equipment connection without rotating the pipe or disturbing the solvent-welded joint upstream.

The rotating ring is the defining functional advantage of the loose ring flange over a fixed-flange design. In a conventional fixed flange, the bolt circle is locked in position relative to the pipe once the flange is solvent-welded — if the bolt holes do not align with the mating connection, the pipe must be rotated to correct the misalignment, which may not be possible in an installed system. The loose ring eliminates this constraint entirely: once the stub end is solvent-welded to the pipe, the backing ring can be rotated to any orientation to achieve perfect bolt hole alignment with the mating flange face, regardless of how the pipe is oriented. At 6" diameter, where large-diameter flanged connections to pumps, valves, and process equipment are common and where rotating installed pipe is often impractical, this alignment flexibility is a meaningful installation and maintenance advantage.

The loose ring configuration also simplifies maintenance and equipment service in flanged PVC systems. Because the backing ring is not bonded to the pipe, it can be slid back along the pipe run to provide clearance when the flange joint is broken for valve removal, equipment access, or system reconfiguration — a practical advantage over fixed flanges in congested mechanical spaces where working clearance at the flange joint is limited. When the joint is reassembled, the ring slides back into position and the bolt circle is re-aligned without disturbing the stub end solvent-weld joint.

The spigot stub end seats against the mating flange face with a flat face configuration that accepts a full-face gasket across the entire flange face area — distributing bolt load evenly and producing a reliable, leak-resistant seal at the flanged joint. The assembly bolts to any standard ANSI 150 lb. compatible PVC or metal flange, and the 6" diameter makes this flange appropriate for the primary distribution headers, process equipment connections, pump suction and discharge ports, and valve isolation flanges that characterize large-diameter Schedule 80 PVC systems in chemical processing, industrial process piping, and commercial mechanical applications.

Manufactured to Schedule 80 specifications and dimensionally compliant with ASTM D2467, the 856-060FT delivers the elevated wall thickness and pressure rating that Schedule 80 gray PVC is specified for in chemical processing, industrial fluid handling, and demanding commercial applications. Gray PVC construction provides broad chemical compatibility with acids, alkalis, and industrial process fluids where metal flanges would be subject to corrosion or chemical attack. NSF 61 certification confirms suitability for potable water contact where required.

Specifications:

Industries & Applications:

• Chemical Processing — flanged connections to pumps, valves, heat exchangers, and process equipment in 6" chemical feed, process fluid distribution, and plant utility systems where bolt hole alignment flexibility and corrosion resistance at the flange joint are required
• Industrial Process Piping — pump suction and discharge flanged connections, valve isolation flanges, and equipment interface connections in large-diameter plant utility, cooling water, and recirculating process systems specified in Schedule 80 gray PVC
• Water & Wastewater Treatment — flanged connections at pumps, valves, and process equipment in treatment plant process piping where 6" Schedule 80 is specified for pressure or chemical compatibility and bolt hole alignment flexibility simplifies equipment installation and maintenance
• Commercial & Industrial Plumbing — large-diameter flanged connections in high-pressure mechanical systems where PVC flange chemical resistance and loose ring alignment flexibility are specified over metal flanged alternatives
• Aquaculture & Food Processing — corrosion-resistant flanged connections at pumps, filters, and process equipment in large recirculating systems and chemical-exposure fluid handling installations where gray PVC chemical compatibility at the flange face is a design requirement
• Irrigation & Agriculture — flanged pump, valve, and equipment connections in 6" high-pressure Schedule 80 chemical injection and large-scale primary distribution systems where loose ring alignment simplifies installation at pump stations and valve vaults