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I am trying to figure out how to put multiple small openings in a pressure vessel and I am having a hard time figuring out what sections of the code apply to what I am doing. Design pressure - 500 PSIG Design Max Temp - 200 Deg F C.A. - 0.00" MDMT - -20 Deg F Carbon Steel Vessel: SA-516-70...

It is NOT lethal service. The weld size is small because it is for a 1/2" Thread-o-let. The preheat to 300F is the guideline in the NBIC for welding on a PHWT vessel so you don't have to complete local PWHT after the repair. Thanks,

We have a ASME U-Stamped vessel that has been PWHT. The Section VIII code boundary stops after the first nozzle weld. After that weld it is considered B31.3. After the nozzle to shell weld,(the Section VIII code boundary) there is a YALE closure welded to the end of the nozzle. This customer...

Little Inch, The design code for the pipeline that the test head will be used on will vary due to the fact that they want to use it on various pipelines that they work on. It just so happens that the first run that they want to use this on is 1.5 x MWP. I as well have seen some shady things...

BigInch, That is the way I looked at the problem, was if the test head is intended to operate at the 2225psig I figured we should go with the Class 900# flanges, however on the other hand, that same pipe line will be tested many times during its life up to the hydro pressure. I am unsure what...

Thanks zdas04, What had me raising the question was the fact that ASME B16.5 Class 600 flanges have an operating pressure of 1480psig up to 100F vs the 2225psig hydro pressure up to 100F. There must be some good reasoning for having these two pressure designations and I am not sure what that is.

Recently we had a customer approach us to design a test head for them to be used for hydro-testing pipelines. Now, they want to have the ability to reuse the test head over and over whenever they hydro-test a pipeline. So here is an example of what I am talking about. Pipeline operating...