ASME B31.9 2017 Swing Check Valve

[SA0110]

Hello All,
Have a project for a condenser water pipe system that incorporates a cooling tower pump that discharges directly into an expansion joint followed by eccentric reducer and into a check valve. The length of run is about 28 inches from pump to check valve. From what researched, the design should take into account a straight run pipe both before and after the check valve that is say 5x to 10x the pipe diameter. Question. What would be the proper industry standard and or building code with the latter language for proper design and installation to avoid flow turbulence. Would it be ASME B31.9 2017 or other?

 

[Snickster]

I only heard of that requirement for meter runs. Never heard of that requirement for check valves at pump discharges.

 

[EdStainless]

I don't know of a standard but I have used check valves where the manufacturer set such a requirement.
If the flow if too turbulent you can get chatter or rattle that will greatly shorten the life of the check.