I was fighting a stubborn flange leak on a 16-inch steam line for two hours, convinced my gasket seating was off, before the old foreman walked by and pointed out I'd missed the hairline crack in the mating surface of the companion flange itself.

He tapped it with a ball-peen hammer and the sound was totally dead, which was the giveaway I should have caught way earlier, so what's your go-to method for checking flange faces before assembly?

3 comments

3 Comments

sam_rivera3mo ago

My buddy Jake lost a whole Saturday on a 4-inch condensate return. He swore the new gasket was junk. Finally ran a clean shop rag over the flange face, just a quick wipe. Snagged on a tiny burr you couldn't even see. Now I do the rag trick every single time, feels for what your eyes miss. That and a good light like Oscar said, covers most of it.

the_sage1mo ago

Hold on, "a whole Saturday"? That's wild. I keep picturing this guy Jake just staring at that flange for hours, convinced the gasket was the problem, while the real issue was some microscopic burr you'd need a jeweler's loupe to see. Ripping apart a whole setup over a defect that small, that's the kind of thing that makes you want to throw a wrench across the shop. The rag trick sounds like solid advice, honestly. But man, the mental image of that lost Saturday is sticking with me. You'd think it was some huge, dramatic failure, not a little scrape you can't even spot with your bare eyes.

oscar_hunt613mo ago

Man, that's a CLASSIC. It's like when you're looking for your keys and they're in your hand the whole time. My go-to is a bright penlight and a straight edge, you'd be shocked what shadows a good light can catch. I've learned the hard way to check the SIMPLE stuff first, because your brain always jumps to the complicated fix.