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  • Users: nihili
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  1. nihili

    Throttle valve for high pressure steam

    Hello everyone, My client is pretending to expand steam at 200 bar and 370 ºC up to 56 bar and 270 ºC which means that this steam goes from nearly saturated to fully biphasic. He thinks it can be done by a valve and after that separate steam from water. However, I have always though that...
  2. nihili

    Nitrogen expansion after pressure reducer valve

    Good morning, I have a installation which needs Nitrogen. I am using Nitrogen gas cylinders. The issue is that I have simulated the expansion proccess in a very simple way: - Inlet line with fixed flow and pressure (around 200 bar) - Pressure reducer valve - Outlet line. Same flow (mass) and...
  3. nihili

    Overpressure protection with ASME VIII

    Good afternoon, I am designing a pressure filter with a design pressure of 6 bar. There are 24 of them working in parallel, all outlets end in a common collector and this collector goes to some cartridge filters. This main header has not any valve. However, this header has a bypass that in...
  4. nihili

    ASTM SA312 TP321 maximum allowable stress

    Hi everyone, I am doing some calculations with piping ASTM SA312 TP321. I am having some troubles deciding which is the maximum allowable stress since ASME 31.1 allows 2 different values for 750 ºK: 12.7 and 17.2 ksi. The diffrence between them is that for the value 17.2 the following note...
  5. nihili

    PSV vs rupture disc

    Hi everyone! Recently I have been involved in the design of a hydraulic circuit with heavy pumps. The prblem came when we studied the shut off case. In case of shut off the piping were not able to stand the pressure so we decided to install PSV valves. Normally, this is not a problem, but in...
  6. nihili

    API 682 (3rd edition) mechanical seal temperature limit

    I have a C2A3A235261 flowserve mechanical seal: Category 2--Arrangement 3--Type A. Do someone know the temperature limit for this kind of seals? I have done some research through the internet and apparently Category 2 can work up to 400 ºC (750 ºF). However when it is type A... the temperature...

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