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  1. crazypiper

    Using a SCH STD WT BW Valve in a XS line

    It's understood that the valve is manufactured to the worst case of any pressure rating/material - that's a given. I should have mentioned that the pipe is calc wall - the code calculations determine that the pipe wall thickness shall be extra strong. In order to match the pipe, the BW valve...
  2. crazypiper

    Using a SCH STD WT BW Valve in a XS line

    Due to a mix up in valves (a common occurance), we have had the following suggestions justifying the use of STD WT BW valves in a XS line. 1. The 12.5 % mill tolerance does not apply to valves, therefore it's OK to weld a STD WT valve in an XS strong line (provided that calculations support...
  3. crazypiper

    corrosion allowance - piping 31.3, 31.1

    I'm looking for ways to simplify piping specifications that we are developing. The traditional corrosion allowance for CS pipe is .0625". This leads to calc wall pipe in sizes 32" to 36" (150# CS). However, we would like to keep everything in this class to a fixed wall. I've noticed that...
  4. crazypiper

    16.34 decreasing bore by adding weld filler and machining

    B16.34, para. 8.4, addresses welding if a defect removal results in a thickness below an acceptable value. Question: If we require a 1.75" BW wall for a valve, but the valve is supplied in 1" wall thickness, can we add weld filler and machine to 1.75" wall (with NDE per 16.34). Or does this...
  5. crazypiper

    Full port gates at relief valves

    We have several relief valve stations that require full port gates (a common requirement at relief valves). This is not a problem for sizes 3" and above, because gates in these sizes are full port by design in most cases. But gate valves 1 1/2" and below (forged) are supplied as reduced port by...

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