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  • Users: PAN
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  1. PAN

    GB E4315 - Filler Metal for welding API 5L Gr. B

    Refer to http://www.chinaweld-atlantic.com/welden/covered_arc_welding_electrodes.htm ; GB E4315 is similar to E6015. However, I cannot find E6015 in AWS SFA 5.1... What is the suitable filler metal for welding API 5L Gr.B? Please advise me...
  2. PAN

    Max. Interpass Temp for Duplex SS

    I've just read the below thread... Super Duplex Interpass Temperature thread1135-200242 I find the requirement of maximum interpass temperature at 100 Deg.C. from Avesta 2507/P100 for TIG welding. Due to the previous thread has been closed. Therefore, I create new thread and hope to see your...
  3. PAN

    Interpass Temperature in Manufacturing of ASTM A403

    In the manufacturing of a reducer per ASTM A403 Gr.WP 321 Cl. WX (100%RT). A manufacturer welded with control of maximum interpass temperature at 200 Deg.C. In my welding knowledge, this is too high for maximum interpass temperature and crack resistibility deteriorates with high interpass...
  4. PAN

    Quality impact due to shield gas purity for welding

    Refer to ASME II SFA 5.32, minimum argon purity is 99.997%. - What are the quality impacts in case of use lower purity (99.9% or 99.95%)? - Please advise me about some technical references for the subject. Thanks in advance... PAN
  5. PAN

    Marking of Pipe ASTM A 358

    In my understanding, the markings on each length of pipe shall include the plate material designations. This is a requirement of ASTM A 358. If the actual marking shows only heat number without plate material designation , can we accept this pipe material? Is this the normal practice in steel...
  6. PAN

    Modify B16.5 flange to B16.36 orifice flange

    I can find the related thread. ANSI 16.5 VS ANSI 16.36 thread174-170011 However, it cannot directly reply to my specific questions. Flange is A182-F321 size 24" Welding Neck Class 300 per ASME B16.5. If the end user requires to drill hole as per dimension in ASME B16.36. It seems that flange...
  7. PAN

    Ball material (Ball Valve)

    If the project specification requires A105+ENP (Electroless Nickel Plating) for ball material, can we use A182-F304? Please advise me about pros and con.
  8. PAN

    ARV valve in GRP fire water piping system

    In the GRP (glass-reinforced plastic) fire water piping system for seawater service, GRP pipe manufacturer recommended to install automatic air release valve at each high pipe in the system. I understand that Ni-Al bronze is suitable body material for seawater application. However, I'm in doubt...
  9. PAN

    Smokeless flare with compressed air supply

    I have read API STD 521 (5th edition). There is only one paragraph indicated about high pressure air for prevent smoke prevention. After consult the flare vendor, almost all famous flare vendors commented that I can not meet Ringleman 1 for this design. I realized that this approach is less...
  10. PAN

    Rich glycol from glycol contactor

    The existing system uses stainless steel type 321. We recently found the crack at pipe base metal. The line is rich glycol service connecting from the glycol contactor (design condition 117 barg @ 105oC, operating condition 109.3 barg @ 49oC). I tried to search the related thread and found only...
  11. PAN

    TOFD for inspection of pipe thickness less than 1/2"

    I understand that ASME Code Case 2235 allows for use TOFD (UT) instead of RT for the thickness of 1/2" and over. How about sensitivity and accuracy for the lower thickness (less than 1/2"). If we use for inspection pipe thickness less than 1/2", what should be the major concerns? Please advise me.
  12. PAN

    Visual criteria for welder test

    I have tried to find the related subject. I find only thread292-132309 . Refer to ASME IX QW-194, I cannot find the clear criteria for complete joint penetration with complete fusion of weld metal and base metal. Should I refer to the criteria in ASME B31.3 Chapter VI Table 341.3.2 for welder...
  13. PAN

    Maximum thickness of lean concrete

    Do we have limit of lean concrete thickness underside foundations? Please advise me. Some project specification indicates minimum 75 mm thick lean concrete. What should be the maximum thickness?
  14. PAN

    Bolt material for high temperature and H2S

    Refer to NACE MR0175, acceptable bolt material for H2S service is A193-B7M. In case of high temperature, A193-B16 should be better for strength concern. However, A193-B16 is not indicated in NACE MR0175. Which is suitable material for high temperature and H2S service? Please comment.
  15. PAN

    Filler metal for WPS and PQR

    If PQR refer to AWS A5.1 E6011/E7016, but WPS refer to AWS A5.1 E6013. Is this acceptable in ASME IX?
  16. PAN

    Changing of manufacturer and model of electrodes

    Should we change manufacturer of welding electrode without new WPS? I worry about the quality of welding work. Please advise me.
  17. PAN

    Design temperature for nozzle load check

    My contractor and consultant propose to use operating temperature for nozzle load check and spring hanger selection. They refer to ASME B31.3 (App.S Para S301.5). However, I disagree with them due to the design temperature is not for short term consideration. In my limited experience, the...
  18. PAN

    Ready mixed concrete for bored pile

    The contractor advise me that ready mixed concrete must be used for bored pile work. Are there any reference standards to reject concrete mixing at site for bored pile work? Please comment.
  19. PAN

    Equivalent of 16MnR

    Please advise me about the ASTM equivalent material of China Standard (GB 6654 16MnR). I used to think that the steel is equivalent to ASTM A516 Gr. 70. However, after comparison of the yield strength value, it seems that 16MnR has higher yield strength than A516-70.
  20. PAN

    Location of drain valve at control valve

    In general, our existing plant installs control valve with by-pass. There is also a drain valve upstream the control valve location. However, our consultant indicate drain valve location at downstream of the control valve for our new project. Is this the general design practice? Any comment or...

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