Condensate Pump Suction Side Valve

[seriouslyreallyserious]

Have a butterfly valve leaking by that needs to be replaced. It is on the suction end of a condensate pump so it likely experiences transients upon startup. It was specified with full-face flanged ends. Was curious if a valve with similar specifications of lug-type would be too flexible, based on others experience. Of note the original valve was rated Class 125, we would probably go Class 150 based on availability.

This is my first post on this forum; I am new to the power industry, focusing on Boilers, HRSGs, and High Energy Piping (B31.1) should anyone ever have questions.

Thanks in advance.

 

[mk3223]

To be sure that the flat face flange and Class 125 valve on the existing piping are typically used on the cast iron equipment. The class 150 valve of the carbon steel valve can be mated with the Class 125 of the cast iron equipment, but it needs to be the flat face flange, no raise face.

 

[seriouslyreallyserious]

Appreciate the note. This all came up as our vendor was offering only lug and wafer type attachments. After talking with them I realized they did not have available, let alone were aware of the full- face flange variety. I have contacted a different vendor who should be more accommodating.

In this process I learned about American Water Works Association (AWWA) C207 flange patterns; as this particular valve is on a condensate line, it appears it was specified by that standard rather than ASME/ANSI B16.5 (for the size used the dimensions and pattern is exactly the same).