Swing check valve, pressure seal bonnet failure

[jerrych]

Mere months following installation 6inch 900# CS BW sch120 leaked at its side flange. Valve is in boiler feedwater service exiting heater @1500psig,600degF fluid conditions. Need to how failure can happen assuming valve was not damaged going in? Any suggestions on this reknowned manufacturing job.

 

[saxon]

jerry, Check with your valve supplier. There's a lot of rebuilt crap coming in from overseas these days being sold as OEM. You may have gotten hold of one.

Hope this helps.
saxon

 

[11echo]

Jerry ...Just to make sure I got the story right, this is a 6"-900# welded end valve? ...SO, did any body check the bonnet bolts torque, before they commission this system? ...Or did they assume it was ok out of the box? ...Mark

 

[Fzob]

What sort of failure was it? Did a stud or bolt fail? Did the bonnet crack? Did a gasket blow out? Something else?

Fred