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Recent content by EGT01

  1. EGT01

    API 521 recommended practice?

    API 521 is a standard, not a code. Here's a link to the API website that explains some things about API publications.... http://api-ec.api.org/publications-standards-and-statistics/~/media/A89289B7F99F4DC8944567880A9357B1.ashx Whether you consider API 521 as mandatory or not depends on who...
  2. EGT01

    Advice on how to move PSV discharge piping with PSV in service

    Typically dual PSV arrangements on refrig units that vent to atmosphere have their own (separate) discharge pipe which would provide the greater flexibility for maintenance. Unless there is some other limitation for having a common discharge pipe, usually, you are not talking about a lot of...
  3. EGT01

    Ammonia Blending, Storage, Shipping - Rego Valves

    Bill, You need to be clear about what "codes" apply to your system. You make reference to API 520 which was developed specifically as a supplement to ASME Section VIII. So does ASME Section VIII apply? If so, and there are no other exceptions to your location, then I think you are required...
  4. EGT01

    Looking For Miniature High Pressure Relief Valve??

    The way you have worded your query is a little unclear. Are you are really breaking your relief valves? Are you looking for a reclosing spring-loaded device or a non-reclosing disk that breaks? In any case, have you considered any of the Compressed Gas Association type devices? Here's a...
  5. EGT01

    Modulating Pilot - when to use

    As another consideration, typically you will not want a pop open pilot valve for liquid relief scenarios in order to avoid liquid, hydraulic hammer issues. You should consider the modulating design for liquid relief. Here are some additional considerations...
  6. EGT01

    API RP521 5th Ed - 4.3.2

    A relief valve does not always have to be set at the design pressure but it must not be set any higher than the design pressure/MAWP for a single valve installation. So I wouldn't say you are wrong on that point but just not completely right. As to the discussion in the thread, it is not about...
  7. EGT01

    API RP521 5th Ed - 4.3.2

    In my opinion, API did a less than adequate job covering this subject. By ASME UG-99 the standard hydrostatic test pressure is... "at least equal to 1.3 times the maximum allowable working pressure (the maximum allowable working pressure may be assumed to be the same as the design pressure when...
  8. EGT01

    Tailpipe losses not limited to 10%

    dcasto, If your relief system was only a PSV nozzle, then I would agree that for critical flow conditions, the back pressure has no affect on the PSV capacity. However, a PSV has a disk that is affected by both the amount of pressure on the upstream and downstream side of the disk. For...
  9. EGT01

    Flame arresetor on Mineral Oil tank?

    Similar to dust explosions, a mist of combustible liquid can also be a concern... http://dx.doi.org/10.1016/S0304-3894(03)00273-5 Sparging with N2 is an advantage especially if your N2 system along with your conservation vents are setup to prevent air from being pulled in. There is some...
  10. EGT01

    Relief capacity conversion

    ASME Section VIII, Division 1, Appendix 11 explains how to perform capacity conversions for pressure safety valves. If you don't have the ASME code you can find an excerpt in the Crosby Engineering Handbook... www.tycovalves-na.com/ld/CROMC-0296-US.pdf Also, don't overlook contacting a local...
  11. EGT01

    RV vent dP calculation - effect of exit

    Here's a link to thread378-126305 that you might find helpful.
  12. EGT01

    PSV Sizing for Shell and Tube Heat Exchanger

    One other point to remember, it is not just the rating of the low pressure side of the heat exchanger that needs to be considered but the evaluation should be made for any other piping and equipment that is associated with the low pressure side of the exchanger.
  13. EGT01

    PSV Discharge Line (ASME Sec. VIII vs B31.1)

    In my opinion, lizking is on the right track. To answer fizzers question... which code should be followed? The answer is the code that applies.
  14. EGT01

    ASME VIII storage tanks

    On the other hand, maybe it's the service provider that needs some education... seems that is why he's here. Could be that the client has mistakenly chosen the wrong spec. Could be you don't know the full story why the client has chosen what they did. Be sure you know the full story before...
  15. EGT01

    API521 --- Fire zone 25 meters or 30 meters

    Like gr2vessels, I suspect you are referring to height. API 521 uses 25 ft, NFPA 30 uses 30 ft which is also the value that API 2000 suggests. If your question regarding fire zone is related to a system that follows API 521, then also review the section in API 521 covering "Vapor From Fire...
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