Class 300/600 flanges
Class 300/600 flanges
(OP)
Is it a violation of ASME B31.1 to use both class 300 and class 600 flanges in the same line?
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RE: Class 300/600 flanges
If the service conditions exceed the 300 class limits are are more appropriate for 600 class flanges, the 300 class flanges are "under-designed" for the system. Not a good situation.
RE: Class 300/600 flanges
Different materials may require / permit different flanges. Nothing prevents the application of the lower class where the material is suitable for the pressure and temperature. for example, a stainless steel instrument may require class 600 where the carbon steel materials are compliant at class 300.
RE: Class 300/600 flanges
RE: Class 300/600 flanges
We use a minimum of Class 600 flanges on all of our valves on Class 150 and 300 lines. For the most part, it makes the stock room a little less crowded, and the field guys can take less stuff in their trucks when they go out. The difference in pricing is more than made up in less stock and less "oh, I need a Class 300 valve...be right back" moments.
"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
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RE: Class 300/600 flanges
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: Class 300/600 flanges
RE: Class 300/600 flanges
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: Class 300/600 flanges
RE: Class 300/600 flanges
Having said that, in many utility and off-site services, Class 150 are used.
"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
Have you read FAQ731-376 to make the best use of Eng-Tips Forums?
RE: Class 300/600 flanges
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: Class 300/600 flanges
RE: Class 300/600 flanges
I am not sure when you would use a NPS 1/2 with a flange. Can you give some examples?
"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
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RE: Class 300/600 flanges
Examples of 1/2" flanged pipe? Orifice flange taps, seal flush connections on API pumps, low pressure steam tracing systems...really not unusual at all.
RE: Class 300/600 flanges
Few users permit threaded line class fittings in hydrocarbon service. It is common for the first block to be welded or flanged with threaded fittings for the instrument interface. I have not been on a project that permitted threaded piping valves and fittings on the B31.3 side of the instrument interface for well over a decade.
RE: Class 300/600 flanges
In many of our projects, we thread 2" and under, and yes, hydrocarbon service. There are some flanges of course, though not many at 1/2" or 1".
I also noticed that many of the fittings and valvs off our "christmas tree" are threaded (up to 10000 psi WOG).
"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
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RE: Class 300/600 flanges