rayc89•1mo ago

Had a flange gasket blow on a 400 psi boiler feed pump yesterday

We were doing a pressure test on a new install at the plant in Springfield, everything looked good until we hit about 380 psi. Heard a sharp hiss and saw steam shooting from the pump's discharge flange. Shut it down fast, but the old spiral-wound gasket was toast. My foreman said it was probably a bad seating surface from a past repair. We spent the next four hours grinding the flange face flat again and putting in a new, heavier gasket. It held fine on the second try, but it killed our whole afternoon. Makes you wonder about the last crew that worked on it. Anyone have a go-to method for checking flange flatness in the field without pulling the whole assembly?

2 comments

2 Comments

stone.simon1mo ago

Ngl, grinding the flange for four hours seems like the long way around. A bad gasket is usually just a bad gasket, not always a warped surface. I've seen plenty of spiral-wounds fail from old age or a bad install without the flange being off. A straight edge and feeler gauges would've told you in two minutes if it was actually out. Sometimes the last crew just used a cheap part.

barbaraschmidt1mo ago

You're right about the straight edge being the faster check. It reminds me of how we often jump to the hardest fix first. Like when my computer acts up, I'll reinstall the whole system before checking if a cable is loose. We assume the problem is big and hard, so we go straight for the big, hard solution. It's a weird habit, always preparing for a war when it's usually just a small skirmish.