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Recent content by onrush

  1. onrush

    Internal Thread After Galvanizing

    Dear Members, The fittings manufactured as per international standard dimension such as ASME or MSS can be galvanized for corrosion protection. Normally the small size galvanized fittings are used with internally or extenrally threaded end. My question is whether the internal thread for...
  2. onrush

    Valve for ASME B31.3 Category M service

    Dear member, ASME B31.3 para.M307.2.(b).(1) specifies as below; ==================== Quote ============================= (1) Special consideration shall be given to valve design to prevent stem leakage to the environment. ==================== Unquote =========================== There may be...
  3. onrush

    NACE RP0391 requirement

    Dear members, In the project piping material specification, the client indicated "NACE RP0391" in item descriptions. However my understanding is that once the material is selected by NACE RP0391, "NACE RP0391" does not have to be indicated in item descriptions to be given to manufacturer. For...
  4. onrush

    316/316L stainless steel and UNS N08825 for Sour Environment

    Dear member, In project piping material specification, client specified "SOUR" in item descriptions of 316/316L stainless steel and UNS N08825 piping components including valves to meet the requirements of NACE MR0175/ISO 15156. I think that 316/316L and UNS N08825 basically meet the...
  5. onrush

    Ej value for welded fittings

    Dear members, ASME B31.3 Table A-1B specifies Ej (quality factors for longitudinal weld joints) for various pipes and fittings. For welded fittings (i.e. ASTM A234-WPB), it allows Ej=1 only if they are 100% radiography examined. However if they are not 100% radiography examined, what Ej value...
  6. onrush

    Definition of wear travel of gate valve

    Thank you so much....^_^
  7. onrush

    Definition of wear travel of gate valve

    Dear members, Could you make me clearly understand regarding the wear travel of gate valves defiend in API 600? Thanks always...
  8. onrush

    Well head piping as per API 6500

    There is no 6500 psi rating in API 6A. That is why I ask this question.......
  9. onrush

    Well head piping as per API 6500

    Dear members, Now is my first experience for well head piping. The P&ID requires spec break between ASME B31.3 and API 6500. My questions are; 1. What is API 6500 piping? 2. What are the codes&standards that govern API 6500 piping? (wall thickness, rating, material spec, etc.) Thanks in...
  10. onrush

    Coal tar enamel coating as per AWWA C203

    Dear members, A project document requires coal tar enamel coating as per AWWA C203 for underground water piping. However this is the first time for me to use coal tar enamel coating for underground water piping. My question is, What is the benefit of coal tar enamel coating instead of PE or...
  11. onrush

    disc and seat material for globe valve

    According to the definition of valve trim in code (API 600), disc itself does not have to be 13Cr nor stellite. The disc surface only is included in trim. If valve body/bonnet material is carbon steel, your proposal " A105 disc having stellite surface" is of course possible unless Client...
  12. onrush

    Non-return (or check) valves process specification

    Dear sheiko, I am a piping material engineer. Followings are my answers, 1. min. operating flow rate 2. this question is for the mechanical design of valves. therefore you should give him/her the most severe condition. Then valve vendor will consider it. 3. Why did piping guy mention...
  13. onrush

    Reference websites or books for LNG piping

    I don't know how to express my thank you......
  14. onrush

    Reference websites or books for LNG piping

    Dear members, Could you recommend good websites or text books or reference books regarding piping design and piping materials including valves for LNG plants or LNG terminals? very thanks in advance......
  15. onrush

    Welding of cladded pipes

    Dear members, I am a very novice for cladded piping. My questions are; 1. Are there any special requirements when welding between inconel 625 cladded carbon steel pipes to be used in sour service? 2. Should welding between inconel 625 cladded carbon steel pipes be done at manufacturers'...
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