flexitallic per crush by valve weight? 2

[1bec]

I have a situation with main steam flange connection. The flexitallic gasket has beeen in place with a 1200+ lb valve on it for weeks with no torquing. Is this a problem when I later torque the joint.

 

[bcd]

Do a quick calculation of the compression or clamping load generated by the flange bolts when fully tightened. You will find that the bolts generate a clamping force that is significantly higher than the weight of the valve. To the point where the weight of the valve is negligible.

 

[racookpe1978]

But .... The suspended weight of the valve, supported irregularly (not uniformly tightened and then star-tightened to full torque) by bolts irregularly around the flange for several weeks, probably - not not definitely - has distorted the flex gasket. May have torn it in places.

i'd change the gasket before tightening and torquing for final fitup.