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Thanks for your replies, The 950F is not excursion but constant temperature and fluid is steam. The pipe sizes are 10" to 4". I still have confusion over "pressure rating" to be same as line design pressure. Suppose pressure rating for flange is 260psi. Is it acceptable for a line with design...

Hi, I have two questions regarding B16.5 flange rating 1. If, for example, at 950F the maximum flange rating is 35psi, does it mean that piping is accepatble at 35psi? What about the margin for bending moment on flange due to piping? If piping is at a pressure near to pressure rating of...

I am still waiting for a reply from some one Waheed

I am trying to analyse the local stresses in pipe (24" sch. 20) at a support without pipe shoe. I have used the euqations shown in the attached file. These equations are taken from "Formulas for stress and strain" by Roark. In 5th edition of the book, the coefficient for 3rd equation is "-1"...

I have tried to rerate it to new code but calculated hydrostatic pressure is more than actual test pressure for the line. It means hydrotest is required to new test pressure. Perhaps Rehydrotest can be avoided if we use 1966 code. After all piping was designed to that code. The lines are 2" to...

Hi, I need to rerate a pipe installed in 1966. Can any body send me the equstion used in B31.3 1966 for calculation of hydrostatic pressure. Thanks in advance. M. Waheed