TXLSUCHE
Chemical
- Mar 13, 2006
- 8
I am calculating the W.T. for 7" OD 10,000# prssure piping using 4130 mechanical tubing. Unless I am misunderstanding B31.3, Section K302.3.2, it appears that it is acceptable to use 2/3 the SMYS for the allowable stress. However, everyone I have conferred with uses 2/3 the SMYS or 1/3 the tensile, whichever is less. Am I missing something in B31.3 that says I have to use the lower of the two? Even most of the allowable stress values given for the materials in Table K-1 use 2/3 SMYS. The piping system I am designing will be operating at about 75 F. Please help.