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  1. msharptx

    Oxygen Sensors on a Vapor Recovery Unit Compressor

    Does anyone have any experience specifying oxygen sensors to be installed on the inlet and outlet piping of a reciprocating compressor, which will be used to shutdown the compressor when the mixture of hydrocarbon gas and air approaches the Lower Explosive Limit (LEL)? What are typical settings...
  2. msharptx

    Offshore Oil Pipeline Launcher Design >> Quick Opening Closure >> ASME Requirements

    I am designing an Offshore Oil Pipeline Pig Launcher Skid in accordance with ASME B31.4. In regards to the Quick Opening Closure for accessing the Pig, I have seen previous "industry" designs where the closure is specified in accordance with ASME VIII Div. 1 and the Launcher Barrel is in...
  3. msharptx

    Spring-operated Relief Valve with greater than 10% backpressure

    Thanks for everyone's help. Sheiko, your english is good.
  4. msharptx

    Spring-operated Relief Valve with greater than 10% backpressure

    Frictional back pressure. Thanks.
  5. msharptx

    Spring-operated Relief Valve with greater than 10% backpressure

    I am tying in a spring-operated pressure relief valve into a vent piping system, which imposes a backpressure greater than 10% (of the set pressure) on the relief valve. From my experience, when the backpressure is greater than 10%, you are required to run the calculations of the specific...
  6. msharptx

    API RP 14E Offshore Piping System Overpressured

    How would you calculate flange cupping? I have all the flange parameters. Thanks.
  7. msharptx

    API RP 14E Offshore Piping System Overpressured

    unclesyd, This is all being done by an offshore crew. I was informed that they replaced the gaskets and fasteners. They reviewed the flanges and pipe, and there was no deformation, but I need to provide 'calculated proof' that nothing happened. Is it true that when the MAWP in a pressure...
  8. msharptx

    API RP 14E Offshore Piping System Overpressured

    This is a continutation of the previous 'Hydrotest Pressure Exceeded' discussion: Quick Summary: The hydrotest pressure (6,500#) was exceeded for a '6 in Pipe (.562” WT) and ANSI 900 RTJ Flange' Piping System (2220# MAWP) for 15 minutes, where gaskets began to leak and the hydrotest was...
  9. msharptx

    Hydrotest Pressure Exceeded

    unclesyd and dcasto, Thanks!
  10. msharptx

    Hydrotest Pressure Exceeded

    unclesyd, Thanks, and sorry if I appear to be going in circles here. We were able to get MTR's on the pipe, which show a yield strength of 50,400 psi (76,200 psi tensile). Using Barlow's Formula, I get an 'Internal Pressure of Minimum Yield' value of 8,550 psi for the 6.625" OD, 0.562" thick...
  11. msharptx

    Hydrotest Pressure Exceeded

    I am writing on behalf of grosenbalm (original post-er) JohnBreen, how do you know it will take 7100 psig to start permanent deformation of ? Is there a specified %SMYS not to be exceeded in ASME B31.3? Thanks all.

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