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  1. terje61

    fire safe "design" verse "tested"

    Hello Breaker34, Example: When performing a fire test, you logically ruin the valve for future use. So when a manufacturer is making expensive valves e.g. 48" control valves, he will not be too happy to perform a test (even if he is allowed to test a 24" valve to certify the 48" size). It will...
  2. terje61

    About selection of valves and process and not a constructive

    Hello ENGMechanical, In spite of the good references above, note that none of them will ever be complete. Since different applications with different medium compositions at different locations quite often require different solutions. The best way to learn if a valve is suitable for an...
  3. terje61

    bolt length

    Hello Pipeliner3000, You can use the link below: http://www.kjbeer.com.au/cgi/flange_size_47.cgi Good luck, Terje
  4. terje61

    API vs. B16.34 valve specifications

    Hello TMBeau, The API and ASME standards have in common that they cover pipeline equipment (and valves). However they have a different origin. The API specifications are focussed on upstream equipment, like wellhead equipment, X-mas trees and subsea piping. The ASME specifications are focussed...
  5. terje61

    Flow measurement

    Hello Balkd, The problem with gasflow is that it is often unclear for the external party (you and me) to see what kind of flow is applicable. - Is this the actual flow (at actual pressure/temperature)? - Is this normal flow (at 1 bara/0°C) - Is this standard flow (at 1 bara/15°C) Now we even...
  6. terje61

    Flow measurement

    1 liter = 0.0353 ft3 1 hour = 60 min. Conclusion: 1 liter/min = 2.11888 ft3/hr This is independent of the medium. Since this question is too easy I am sure that this is not what you would really like to know. Could you please detail your question? Gr. Terje
  7. terje61

    Butterfly valve linkage calculatulation

    Hello ray1761, I think that you would be really fortunate if you could get a linear relationship between your actuator and the valve flow. 1) A butterfly valve has an inherent quick open characteristic. This explains the aggressive flow curve you describe in your second post. You need to...
  8. terje61

    Keeper of the Knowledge Mentality

    KoK's or SuK's are one thing. What I am more worried about is that most new people asking questions only want the answer and not the reason why. Going back to the analogy with the fish: they only want a fish today and not learn how to fish. How do they think that they will ever become experts?
  9. terje61

    3.2 level certification

    I believe that everybody is correct in here. - You can never call a stamped 3.1 certificate a 3.2 certificate. It will remain a 3.1 certificate. (as mentioned by RWLucas / micalbrch) - If you need 3.2, you have to make a new certificate and get it certified by a third party appointed by the...
  10. terje61

    'Standard type' valve data sheets?

    In Norway datasheets are standardised in the Norsok I-001. See the link below and then go to Annex C. http://www.standard.no/en/Sectors/Petroleum/NORSOK-Standard-Categories/I-Instrumentation/I-0011/ And GerhardL is right they remain quite general. Good luck, Terje
  11. terje61

    ESD Valve actuator

    Hello Itascot, The supplier mentioned in the article you refer to has been running around our equipment for several days. This system only measures the outlet air from the actuator. We (the supplier and I) have found that this is the worst indicator of anything ever. Example: - 16" 900# ESD...
  12. terje61

    ESD Valve actuator

    Hi Itascot, I will explain my arguments: 1) If a valve is susceptible to sticking you do not require PST for safety, but for NORMAL operation. Hence you cannot use the PST for increasing your safety level. 2) Valve forces depend on many items: - temperature (changing viscosity of your...
  13. terje61

    ESD Valve actuator

    JimCasey: be carefull with doing partial stroke testing. Although it has now become a more common requirement, this is mostly for dubious reasons. In my opinion: - PST does not increase safety levels. - PST does not prove that an ESD valve will close. - PST does not show that valve forces have...
  14. terje61

    Flange lifting device

    Attached a sketch to explain what I mean. http://files.engineering.com/getfile.aspx?folder=011243f0-152b-42bf-a469-17232fb533b7&file=Lifting_sketch.pdf
  15. terje61

    Flange lifting device

    Dear all, I heard of a lifting method for valves where one or more plugs are inserted in the flange holes and on the other side a lifting eye is screwed into the plug. Is anyone familiar with this kind of lifting and do you know where I could purchase these plugs? Thanks for your advise. Terje
  16. terje61

    Christmas Tree Rating

    Hi Johnrem, Since the valve you are looking for is not an ASME valve and not an API valve, it is difficult to use these standards. Note that the standards are there to make your life easy, so you have clear rules and if you follow them the valve should be good for purpose. Now you have to work...
  17. terje61

    Christmas Tree Rating

    Hi Johnrem, 1) A valve manufacturer could for example design a valve that is suitable for ASME 2500. They could use normal carbon steel material e.g. ASTM A352 Gr. LCC for a casting. The wall thickness is quite thick, because this is a low strength material. If they would select an API carbon...
  18. terje61

    Hysteresis & Dead Band Tests on (electric actuated) ON/OFF valves (!)

    The "Benchmark Performance Test" looks the same as what I meant with a "Valve footprint". When using pneumatic operated valves it is almost standard available in smart positioners. It more or less consists of a hysteresis test / dead band test / response time test. As mentioned, it is used on...
  19. terje61

    Hysteresis & Dead Band Tests on (electric actuated) ON/OFF valves (!)

    Hello Anegri, I cannot see any actual application for hysteresis and/or dead band testing to on/off valves. What I do see is the growing interest in making valve/actuator footprints. Which is actually also some kind of hysteresis + dead band test. With the footprint we try to establish if the...
  20. terje61

    Christmas Tree Rating

    1) Upgrading/uprating is not a standardised work method. The API 6A has clearly identified several classes and if you would work in line with the API 6A you would have to go from API 5000 to API 10000. But that does not mean that you cannot do it. Sometimes materials do not allow to go to 690...

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