Smith-Blair Style 921 Top Bolt Wide Range Flanged Coupling Adapter - 2-12 in

The Smith-Blair Style 921 Top Bolt flanged coupling adapter (FCA) is a wide range plain end x flange adapter in fabricated steel: one part seals a wide range of pipe ODs within a nominal size, up to 1.31 in, to connect plain-end pipe to flanged fittings, meters, valves and other flanged equipment, 2 to 12 in. The 3-12 in flanges carry AWWA C207 Class D (ANSI 150 lb) drilling; the 2 in is a standard meter coupling flange.

The coupling end tightens with a single top bolt and stabs on with no disassembly. A removable, bi-directional channeled inner gasket covers the lower part of the range and comes out for pipe in the upper range, and the two-piece coupling flange can be taken apart on site to replace a gasket. Choose the nominal size; each size covers the full OD range in the table below.

Application: connecting steel, ductile iron, PVC, copper, AC and HDPE plain-end pipe to flanged fittings, meters and valves, 2 to 12 in.

Key Features

• Working pressure 175 PSI on every size
• Wide range: one part covers up to 1.31 in of pipe OD within a size
• Single top bolt on the coupling end; stab fit with no disassembly
• Removable, bi-directional inner gasket and two-piece coupling flange for field gasket change; up to 4° deflection
• Certified to NSF/ANSI 61 and NSF/ANSI 372; meets applicable AWWA C219 standards

175 PSI on every size, 2 to 12 in. For a particular installation the allowable pressure also depends on pipe type and condition, service conditions and installation workmanship.

Materials subject to change by the manufacturer.

Carbon steel, stainless steel, ductile iron, asbestos cement, PVC, copper tube and HDPE pipe. HDPE and thin-wall PVC take pipe stiffeners, which Smith-Blair requires on those pipes.

Choose the size in the first option; the part number shows in the last option.

Lower range with the inner gasket in place; upper range with it removed. Minimum pipe insertion 2.88 in (2 in), 3.38 in (3 in) and 3.50 in (4-12 in).

• Designed for stab fit, so no disassembly is needed: inspect the shipment and clean the pipe where the gasket seats.
• Measure the pipe OD: for pipe in the upper range, remove the inner gasket; for the lower range, leave it in (table above). A removed inner gasket can be reinstalled.
• Lubricate the pipe and gaskets with a soap-and-water solution that meets the water and pipe supplier's requirements, and insert the pipe at least the minimum insertion in the table note.
• Keep pipe deflection within 4°, and fit pipe stiffeners first on HDPE and thin-wall PVC.
• Tighten the single top bolt to the torque Smith-Blair specifies with a calibrated torque wrench, and recheck after the line is pressurized.
• Anchor the pipe: the FCA seals around it but does not restrain it, and Smith-Blair requires proper anchoring to restrain pipe movement and prevent pull-out.

From the Smith-Blair Style 921 Datasheet and 921 Specification (Rev 7/1/16), in the Data Sheet tab.