Smith-Blair Style 413 Transition Coupling - 304 Stainless, 14-48 in

The Smith-Blair Style 413 expanded-sleeve transition coupling joins plain-end pipe of the same nominal size but different ODs, from 14 to 48 in: the large end fits the ductile or cast iron pipe OD (15.30 in at 14 in nominal, up to 50.80 in at 48 in) and the small end the steel pipe OD (14.00 to 48.00 in). A 3/8 x 12 in fabricated steel sleeve, expanded at one end, carries steel followers and Nitrile gaskets, with anchor loops welded to the sleeve so each follower end is secured on its own, and Type 304 stainless steel bolts with coated nuts.

Choose the nominal size and large-end OD in the first option and the small-end OD in the second; order by the exact ODs of both pipes.

Application: joining steel pipe to ductile or cast iron pipe of the same nominal size, 14 to 48 in.

Key Features

• Working pressure up to 150 PSI
• Expanded sleeve takes the full steel-to-iron OD step at each size
• Allows limited expansion and contraction and dampens vibration to reduce pipe fatigue
• No special pipe-end preparation; deflects to change pipe direction without elbows or bends
• Meets applicable AWWA C219; certified to NSF/ANSI 61 and NSF/ANSI 372

Up to 150 PSI, the standard design rating. Smith-Blair notes that a coupling's working pressure depends on pipe type and diameter, sleeve thickness and material, gasket cross section, follower type and number of bolts; higher-pressure designs are built to order.

Materials subject to change by the manufacturer.

Steel pipe at one end and ductile or cast iron pipe at the other; the 413 also serves stainless steel, asbestos cement and PVC pipe of matching OD. HDPE requires pipe stiffeners.

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

Bolts from the Style 413 datasheet expanded-sleeve table; deflection from the Model 413 spec for a 10 in and longer center sleeve. Sleeve 3/8 x 12 in on every size.

• Pipe stiffeners are required when the coupling is used on polyethylene (HDPE) pipe.
• Clean the pipe ends, then slide a follower onto each pipe, followed by a gasket with its beveled edge facing the pipe end; lubricate the pipe and gaskets with a soap-and-water solution that meets the water and pipe supplier's requirements.
• Center the pipe gap in the sleeve: with the 12 in sleeve aim for 1 in on a straight run and no more than 6 in (sleeve length less 6 in).
• Hand-tighten the nuts, then tighten gradually, alternating between opposite sides so the followers stay parallel, to the torque in the instructions; recheck torque after the line is pressurized.
• Allowable axial pipe movement per coupling is 1/8 in through 2 in nominal, 1/4 in over 2 to 10 in, and 3/8 in above 10 in.
• Anchor the pipe: the coupling seals around it, and Smith-Blair requires proper anchoring to restrain pipe movement and prevent pull-out.

From Smith-Blair Installation Instructions TI-017 (Rev 08/26/21), in the Data Sheet tab.