stem MAST calculations per API 6D 6.17.1
stem MAST calculations per API 6D 6.17.1
(OP)
Hello,
When verifying stem MAST calculations against API 6D 6.17.1, should the ASME BPVC II pD allowable stress at temperature be used to get the "design torque" or should the yield limit of the material be used?
Any thoughts?
When verifying stem MAST calculations against API 6D 6.17.1, should the ASME BPVC II pD allowable stress at temperature be used to get the "design torque" or should the yield limit of the material be used?
Any thoughts?





RE: stem MAST calculations per API 6D 6.17.1
RE: stem MAST calculations per API 6D 6.17.1
RE: stem MAST calculations per API 6D 6.17.1
There is no reason to use ASME material limits for this analysis unless for some reason, someone could argue that the weak portion of the stem is pressure retaining. In other words, if the portion of the stem that would break due to excessive torsion would result in uncontrollable release of product outside the valve.
Do your calculations based on various parameters, build a prototype and test it. Compare the results and decide which method is best. Can't argue the results if you back them with test data.