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  1. br549

    Protection of vessels from temperature excersions

    680F is Just above the value were ASME begins derating material strength because of temperature (600F) Ideally you would look at both pressure and temperature extremes and design for the worst case. If this is AN ASME vessel Check the CODE plate attached to the vessel you might already be...
  2. br549

    Protection of vessels from temperature excersions

    1> Design the vessel for the max temperature possible, (ideal for new system) 2> the blow down system need to be redundant, not part of the normal process control. 3> it needs to be a fail-safe system, i.e. loss of signal causes system to activate 4> it need to have controlled access, i.e. plant...
  3. br549

    relief devices on vessels containing gases

    I have also used a PSV and a rupture disc in combination Design the PSV for process upsets and the rupture disc for fire case since the disk is both temperature and pressure sensitve.
  4. br549

    Slope for steam line

    The answer to this question is always room for debate! 1. Good pratice says slope and trap to the excess, if you have ever seen An 8" elbow separate because of water hammer start-up you will understand. 2. Because you specifed slope dosen't mean your contractor installed it that way. 3...
  5. br549

    Spectacle Blind Plate Specification

    You Might want to look at Cam-Set, This is the higher end of the spectical bline market but has some really nice features if it will be used a lot. MFG Fetterolf Corporation
  6. br549

    Max Allowable Working Pressure for Welded & Npt Piping

    You have talkd about pipe but in most instances the rating of you flanges is the limitng factor of your piping system. These rating are based on leakage as well as pressure contament, leakage typically being the controling factor.
  7. br549

    Comparison of B31.1 vs. B31.3

    It perty simple B31.1 is power piping (read this as steam) B31.3,is chemical piping or any thing that's not steam The big differnce is the safety factor use in the calcuation b31.1 is more strigent ie higher safety factor/more inspection.
  8. br549

    Car-Seals

    Car-seal open / closed is typical a sytem put in place to re duce human error. inadvertantly closing an valvethatneeds to remain open like a bolck valve under a relief valve for serviceing the releif valve while operating. Usually there are procedures specifc to the process for the removal of...

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