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Just realized everyone swears by that blue thread sealant, but it failed me on a high-pressure job.
I was patching a 4-inch feedwater line at the plant in Toledo last week, and I used that popular blue paste everyone recommends. After we pressurized to 850 psi, we got a slow weep at a flange joint. Had to shut it down, clean it all off, and redo it with a different brand. I learned that what works for low-pressure steam might not hold up when you really crank it. Has anyone else had a sealant let them down on a high-pressure system?
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keith_rivera191mo ago
You said it failed at 850 psi, but that's not a sealant problem. That blue paste is meant for tapered pipe threads, not flange faces. You put it in the wrong place. The weep was from the gasket surface, not the threads.
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jesse_green551mo ago
Heard that exact same thing from a plumber last week.
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