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hi, The concept of system MAOP is same as the design pressure. It is techically possible to weld two dissimilar materials.In that case ,the welding and PWHT procedures shall follow special requirements mentioned in ASME 31.4 . Some of them are: 434.8.8 Preheating and Interpass Temperature ...

hi, The concept of system MAOP is same as the design pressure. It is techically possible two dissimilar materials.In that case ,the welding and PWHT procedures shall follow special requirements mentioned in ASME 31.4 .Some of them are: 434.8.8 Preheating and Interpass Temperature : When...

hi There is no problem having a code break in a pipeline system provided that every segment in the system have MAOP(Maximum Allowable Operating Pressure) more than the required system MAOP. and why would you want to install a WPB grade TEE on and X60 grade pipleine?. If TEE run is part of the...

Hi Ripz , Thanks for the response.. The operating temperature during Hot Tap will be around 150deg F. By "Engineering Assessment" did u mean FEA analysis of the weld and tee ? or is there a simpler way to prove that stress relieving is not required?

As per ASME B31.8 para 825.3 Welds in all carbon steel shall be stress relieved when the nominal walthickness exceeds 1.25inch. I am working on a sales gas pipeline project, where a 48 inch Hot tap connection is to be made on 56" pipeline. The Hot tap split tee vendor has proposed a split tee...