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B31.3, B31.4

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ammanford

ammanford

Petroleum
Aug 29, 2012
1
Can anyone tell me the main differences between ASME B31.3 and B31.4?
 
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There are many differences. Read the two Codes as others have to determine the differences.
 
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To further enumerate: Scope of use, design/allowable stress, NDE, preheat, PWHT, pressure testing, etc, etc, etc.
 
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Maybe the most noteable difference, apart from the clear differences as pointed out by DSB and stanweld, is that B31.4 is for pipeline(s) (transportation of liquid hydrocarbons), whereas B31.3 is a piping code (which may convey all kinds of fluids). This may seem like a trivial answer, but from my POV its a big difference for starters.
 
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