I'm looking for the code about hydrostatic test pressure for piping. As I've found, the latest version is "ASME B31.3 PIPING GUIDE (2004)"./gatevalve And according to this code, the hydrostatic test pressure for piping is "1.5 x DESIGN PRESSURE x St/Sd".

But my team manager told me there's a new standard which hydrostatic test pressure for piping is "1.2 x DESIGN PRESSURE".

Have you ever heard about this latest standard?
I can't find about this anywhere.

I've got it right here and the title is "Gas Transmission and Distribution Piping Systems"  The copy I have is ASME B31.8-2003.

We've had many discussions over the years about whether Gas Gathering comes under B31.8 or under some other code.  Section 802.11 (Scope) says "This Code covers the design, fabrication, installation, inspection, and testing of pipeline facilities used for the transportation of gas."  Section 802.12 (exclusiong) (f) "Wellhead assemblies, including control valves, flow lines between wellhead and trap or separator ..." Which seems to imply that B31.8 covers upstream piping after the wellsite separator.  The big question is what code applies between a wellhead and a separator?  No one knows, but some companies say it is B31.3, some say "we've got to use something, so we'll apply B31.8 even though it is explicitly excluded".  Bottom line is that you need to make a decision about design standards and document it.

Being that gas pipelines use different design factors through different area classifications and have many types of external loading and installation stresses thwart any effort to standardization on one internal pressure anyway.  You can have up to 4 wall thicknesses on DF criteria alone on gas lines.  Oil lines use one design factor, but still have different external load types.  A few road/railroad crossings, fault crossings, landslide areas, river crossings, extra burial depth, aerial crossings(?), offshore platform risers with wave loads, different water depths and external pressures, installation stresses, etc. and you can see the number of wall thicknesses required to meet just one internal design pressure, with many different external load catagories and combinations, is many.

The BTC (1750 miles of 42") pipeline has 9 different wall thicknesses.

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