Bolt Torque Calculations as per Dennis Moss

A: A: Back-of-envelope holds. 7/8" B7 at 60% yield lands ~80–90 kips. Multiply by diameter in feet and K=0.18 and you're in the high-400s. That's Moss 101. B: That's a table memory bleed-over from 3/4" hardware. Order of magnitude is off. C: That torque would put the shank past yield even before accounting for scatter. D: Lubrication reduces K, it doesn't erase preload. Subtracting gasket compression double-counts the same force.

A: A: That's the target. Torque is a proxy; friction noise dominates. PCC-1 is about reducing that spread. B: Bolt-to-bolt interaction exists, but PCC-1 isn't a vessel code check. C: Relaxation is real, but PCC-1's preload focus is upstream of that problem. D: Thread damage is a maintenance issue; PCC-1 assumes intact hardware.

A: A: Heat-up unloads bolts if materials and lengths aren't matched. Leak shows after temperature, not at pressure test. B: Extrusion would show immediately and worsen with pressure, not temperature. C: Flange rotation leaks show up cold and during hydro. D: Pitting causes chronic seepage, not a clean post-startup alarm.

A: A: Pressure adds load to the joint. Adding torque stacks stresses unpredictably. B: Star pattern doesn't fix combined pressure and thermal load. C: Local tightening induces flange rotation and worsens the leak. D: Pressure seating is a myth here; it unloads bolts further.