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Hello, I am currently helping my company revise our ANSI pipe specs. What we are finding is that for normal-temp specs (both sweet and sour service), some companies have chosen to specify low-temp materials for larger diameters. For instance, B-spec will switch to low temp for 24 NPS, and...

Thanks for the confirmation!

But does ASME Section VIII state anywhere that you can de-rate the pressure to increase design temperature? Or am I stuck getting the manufacturer to amend the CRN?

Does B31.3 work for these dampeners though? They have CRN's so I would imagine they would be covered under ASME Section VIII. I'm trying to avoid talking with the manufacturer and getting a deviation from them.

Have a propane reinjection pump with suction stabilizer and discharge dampener. Stabilizer: design temperature 100F @ 740 psig Dampener: design temperature 100F @ 1480 psig It turns out the fluid stream could be as high as 115F. What codes are applicable to increase the design temperature by...

I’m still working on the package, and still having trouble deciding how to handle the many 1” lines. There’s gas, emulsion, oil, water, and drain 1” lines. I have thought of the following: • Socket welding the entire lines (I don’t think this is necessary especially since it could warp the...

Sorry that should read sockolet description IRE x SW. I know IRE must indicate a large main pipe size than the sockolet branch or something but I have never seen this term.

Thanks for the responses. Sounds like it will be up to the fabricator whether to shop fab the threads onto the pipe or to order threaded pipe and cut to length on the socket weld side. New question, can anyone tell me what "IRE" is standing for on a socket weld description that is IRE x SW...

Hi There, I am working on a separator package which has SW/Threaded pipe in some sections, as in threaded and socket welded connections on the same line. I am wondering if the threads are bored into the pipe in the fab shop or if the pipe must be bought threaded and then cut to length to fit...

Hi Everyone, Question for you. What's more cost effective for a double block and bleed arrangement. Purchasing and installing a dedicated double block and bleed valve, or purchasing the separate components (two block valves and a drain valve) and fabricating the arrangement as part of your...

Hi, I am wondering what the pros and cons are for socket weld vs threaded connections for drain and vent branch connections (so sockolets vs threadolets) in an oil and gas application. Specifically I am working on a sweet separator package but I'm also wondering what effect sour service would...

Perfect. Thanks guys!

Have read some piping isometrics that state "3000# FS" fittings. I know it is referring to Class 3000 pressure rated fittings, but what exactly does the "FS" stand for?

There are a few different pressure rating systems. They group pipe, valves, fittings, etc. into a class to describe how much pressure they can withstand. The ANSI pressure rating system is very common: http://www.engineeringtoolbox.com/ansi-flanges-pressure-temperature-d_342.html

Okay, maybe we can take this back a step. The hydrotest pressure indicated in the following link: http://www.engineeringtoolbox.com/ansi-flanges-pressure-temperature-d_342.html Are they no the maximum allowable hydrotest pressures for each ANSI pressure rating class?

Hi All, Can across a situation yesterday and I am still unclear on the details. Had a 150# piping system with a design pressure of 1770 kPA. Now that would make the minimum hydrotest pressure 2655 kPa. The Client actually had the hydrotest pressure set at 2948 kPa which I was fine with...

I need to source two small chemical injection pumps with very low flow rates (24 gal. / DAY). Where should I start the search - do any Vendors specialize in this area?

Ya I meant B16.5 not B31.5, my bad. It is not mentioned in B16.5, but it is briefly mentioned (once) in B16.34 and all it says is "Class 800 is not a normally tabulated ASME B16.34 designation, but it is an intermediate class that is widely used for socket welding and threaded end valves."

Starting to make a bit more sense. So I take it when you read "Class 800" or "Class 6000", they are actually referring to 800 CWP and 6,000 CWP respectively, because I can find no mention of an ANSI 800# class in B31.5.

Hello, I am wondering how the different valve pressure rating systems work and also how they relate to each other. I'm familiar with the standard ANSI pressure ratings: Class 150, 300, 600, and 900; but I believe there's also Class 125, 800, 1500, 2500. Is this correct (mostly is Class 800...