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Recent content by LSUUR

  1. LSUUR

    Double valve operation in cryogenic service

    Hello All I would like to get advice on problem I am facing. I have delivered few small packages as attached file, two vessles are there and one is operating, one is stand by. Fluid is LNG with oil particle.(Operating temp : -146 degC) When change from operating to stand by(verse is same), we...
  2. LSUUR

    Please help to verify weldment size

    Hi all I am working in pressure vessel fabrication company. Recently I got comments from our customer but I could not answer from my collegue and calculation company. I'd like to explain briefly. It is related to pressure vessel(horizontal type) internal weld(tubesheet to shell). Tube sheet is...
  3. LSUUR

    ASME Material certificate?

    Thank you for your advice and providing information. I have requested guarranty letter to mill maker which proof material was fabricated in accordance with ASME 2017ED and will try to persuade customer to accept with this letter.
  4. LSUUR

    ASME Material certificate?

    Hi everyone. During material inspection, Material was rejected by customer due to ASME edition is not described on material certificate. Chemical composition and mechanical property are met in accordance with ASME ed2017(same as design code edition). Client requests to describe edition on...
  5. LSUUR

    Valve direction

    Thank you for the reply. valves are used for cryogenic condition and cavity relief and floating ball type. Is there any requirement valve installation direction in the rules or codes?(such as valve shall be installed as per flow direction or etc.)
  6. LSUUR

    Valve direction

    I have an arguement with our customer about valve flow direction. Our ball valve has uni direction and flow mark on the valve body and valve will be leaked in reverse flow. Our skid has 2 vessels, one is working and the other is stand-by. As you can see attached file, flow direction is red...
  7. LSUUR

    NPT Leakage in cryogenic condition

    Hi, I have a problem about leakage issue at NPT thread in cryogenic condition(operating temp. is -143 degree C) Our filter has NPT(316L) and will be installed in tubesheet(316L) of vessel by hand tightening. Normally we use teflon tape or sealant for ensuring tightening but it is not allowed by...
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