Flange and Gasket Best Practices

“Also, PSA: don’t mix a full-face flange with a raised-face flange,

especially with cast iron. That combo can warp or crack the flange. And full-face flanges

in Class 150 systems? They’re kind of notoriously bad for sealing anything critical.”

“Another thing: don’t slather metal-based anti-seize on gasket surfaces. Under heat and pressure

it can weld itself into the serrations and totally mess up the flange. Plus it lubricates

the gasket, making it easier for internal pressure to push it out.” “Torque loss happens

when bolts stretch or the gasket relaxes over time, which is normal. But you can reduce

it by using a thinner gasket, a denser gasket, stronger bolts, more bolts,