Fastener Strength given Pressure
Fastener Strength given Pressure
(OP)
Hello. I am trying to calculate the stress on a given thread within a pressure assembly. The knowns are the thread size and material, the working pressure, and the number of threads currently engaged. Can anyone help...I'm rusty on the calculations.





RE: Fastener Strength given Pressure
"You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein
RE: Fastener Strength given Pressure
RE: Fastener Strength given Pressure
T= (k∙f∙d)/12 (U.S. Customary Units)
The fastener load has to compress the gasket so it conforms to the flange surfaces, and to "seat" the gasket into the flange. The combined force needs to:
1. Overcome the hydrostatic forces generated by the internal fluid pressure trying to push the flanges apart
2. Compress the gasket enough to hold it in place when the internal pressure is trying to penetrate through the gasket and/or gasket/flange sealing surfaces
3. Maintain some residual load on the gasket after the hydrostatic load has unloaded the gasket, which involves the gasket factor m.
The hydrostatic end load on the flanged joint and a residual gasket load:
Wm1 = ((π•G2 • P)/4) + (2 •b•π •G • m • P)
Minimum seating load on the gasket:
Wm2 = (π•b•G)y
The greater of the two values-Wm1 or Wm2-will is the minimum required design bolt load. Minimum required fastener load divided by the number of fasteners in the joint will determine the minimum force.
or try:
htt
http://