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Hi RVAmeche, from what I understood reading other threads, this is mainly due to the force the gas or liquid flow is applying due to its kinetic momentum. Try to picture it as a water canon shooting at you: the water has left the hose already (so static pressure equals ambient pressure), but...

Hi Latexman, the discussion was originated because of a particular case, but we've had a similar discussion already for other cases, therefore for us it was a general discussion about how to work with these situations. Since in this particular case we are working with a threaded male NPT inlet...

Thanks EmmanuelTop, I had a look at the pdf, interesting. It still seems awkward to me though, that just making the safety valve fit on the piping with this reducer, it is the reducer that's already leading to the 3%. Maybe I should doublecheck the flow calculation of the pressure drop over the...

Hi all, With a colleague I'm having a discussion on how to interpretarte the API 520 Part II recommendation of not having more than 3% pressure loss at the inlet piping to the PSV. I'm already aware of the following: “The calculation should contain only NON-RECOVERABLE losses. For gases, you DO...

ok, thank you all for your feedback, it has been helpful. Not an easy topic to resolve though for connecting for example a SS pipeline to a CS pipeline. Bridging by earthing is a factor that's hard to eliminate in plants; a lot of times eventually there will be some contact through supports...

thanks Moltenmetal. I did some more research on the internet as well and more or less came to a similar conclusion. For small SS valves on large lines it can be tolerated, but is not 100% recommendable. For SS to CS flange we normally apply an insulating gasket with insulating bushes and washers...

Try looking into ASME 31.3, Part 2 "Pressure design of piping components (303 General). It will give you the proper instruction. But first make sure (just like Aladin5020 said) what code you should use, it might not be 31.3....

If anybody has seen a good thread about this topic in eng-tips.com, also please let me know (the ones I found didn't quite clear my doubts) Thanks1

You also normally still have some extra margin between the actual wall thickness chosen commercially and the sum of what you calculate that the wall thickness should be according yield tension, plus the specified corrosion allowance. For instance, let's say I calculate for a CS pipe that I need...

Hi everybody, I've been doing some searching in various threads of the forum, but I still remain with some doubts on this topic: I've seen various plants that use the typical NPT stainless steel ball valves in Carbon Steel piping, for example for vents and drains on cooling water piping...