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  • Users: Diborane
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  1. Diborane

    Work Place Politics

    Hi, What is the best way to deal with this situation. About a year ago I emailed a senior engineer at my company to confirm a sizing issue. He reconfirmed the criteria and said that my work was correct. I even went one size higher than our undocumented sizing criteria to handle surge flows...
  2. Diborane

    Industrial Heat Pumps

    Hi all, I recently read a paper on industrial heat pumps by the DOE for applications other then just environmental heating/cooling. http://www.p2pays.org/ref/32/31234.pdf The paper whet my appetite for possible applications of the technolgy and I started playing around with some numbers. I...
  3. Diborane

    Vacuum relief from steam collapsing

    Could you all discuss vacuum relief due to steam 'collapsing' (condensing) in a tank not protected for full vacuum, which does not have an open connection to atmosphere? Vacuum protection from pump out, drain out, thermal vacuum, all seem to have relatively small vacuum relief flows compared to...
  4. Diborane

    Safety Relief requirements, external fire

    I recently completed sizing the SRV flow requirements for an ASME stamped vessel. One of the cases that I checked was for external fire causing the vaporization of the contents according to API 521 3.15. My work was then sent for review to a senior engineer. He stated that I did not need to...
  5. Diborane

    Use of rupture pin shutdown valves

    It is easier to explain my question with an example. The MAWP of pressure component (vessel/heat exchanger, excetera) is 90 psig. Pumping into the component is a pump capable of putting out 120 psig at a zero-flow condition. This condition could happen if a valve downstream of the vessel was...
  6. Diborane

    Exceeding ANSI/ASME B16.5 Flanges pres/temp ratings

    Hello, ASME B31.3 gives specific exceptions which allow the pressure in process piping to exceed the recommended rating. Such as 20% for no more than 50 hr at one time or 500 hr/yr. Does such an exception exist for ANSI/ASME B16.5 code? I did not see such an exception in code book I have...
  7. Diborane

    Deadhead pressure Variable speed pumps

    Hi all, When working with fixed speed its pretty easy to determine the dead-head pressure of the pump. Just look at the pump curve for your impeller size at 0 flow. For a variable speed pumps I have been calculating the deadhead pressure at the maximum motor rpm. Is this too conservative...

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