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Recent content by devaxrayz

  1. devaxrayz

    Max Flow through pipe

    As explained in earlier post by zdas and cheute, the water flow is function of several factor. The concept is: the pressure drop (depends on flowrate) of water flowing in the pipe will be equal to available delta pressure in the system. The calculation to calculate the pipe system capacity...
  2. devaxrayz

    Underground vs. Underground?

    Access is may be one reason... Fire water ring for example. it usually designed to surround your equipment. If it installed above ground, it may block operating or maintenance access to the equipments -rayz-
  3. devaxrayz

    The Effect of PSV setting to pump motor

    Hi all, This question may sound very basic, but I need your opinion on this: There is a reciprocating pump, 150 gpm with 25 psig discharge pressure (head: 60 ft) BHP: 3.7 hp and motor selected is 5 hp. The pump maximum pressure it self is 350 psig I use PSV to protect the class 150 line and...
  4. devaxrayz

    Effect of Dissolved Gas to NPSH available.

    Morten Thanks for quick response, I agree that HYSYS are not reliable on entrainned gases. However my major question has not answered yet. In real life if there is any dissolve gas (entrained gas) in my liquid, did I will have cavitation caused by bubble of gases that is break when pressure...
  5. devaxrayz

    Effect of Dissolved Gas to NPSH available.

    Effect of Dissolved Gas to NPSH available. Dear all, I would like to know what is the effect of dissolved gas to NPSH available calculation. My liquid is shipping oil. This shipping oil have undergo gas-liquid separation and oil-water separation. However, my HYSYS simulation shows that in the...
  6. devaxrayz

    Bypass for big sized Control valves

    Reena, I always consider that the gate valve is not suitable for throtling because of the erosion on the disc. Because of gate valve is less restrictive than globe valve, it need less opening (leads to higher velocity) for the same flow compare than globe valve. However by-pass is rarely use...
  7. devaxrayz

    About vessel design temperature

    CJKrueger, Your saying about flange and instrumentation is absolutely right, and I agree that we can not take the 650 F design temperature thing easily. Joe Wong, thanks for your explanation, it is confirmed my understanding about MAWT. So back to adx question, it can not be say as...
  8. devaxrayz

    About vessel design temperature

    All, I'm sorry but I’m a little confuse here and maybe this will be a little bit out of discussion. First question came over of my head IS DESIGN TEMPERATURE ALWAYS THE SAME WITH MAWT? You might already hear the similar question with term of pressure and the answer is no (because it depends on...
  9. devaxrayz

    vapor recovery in tanks

    Hienbo, I'm a little bit curious... what is your method in calculating 0.69 MMSCFHr (16.56 MMSCFD) vapor generated in your storage tank? It seem very high in my opinion for tanks emission(or is there in reality?). If you calculated it based on outbreathing calculation as like in API 2000 (i...
  10. devaxrayz

    METAL IMPELLER PUMP VERSUS POLYMER IMPELLER PUMP

    Mineng76 Dont forget about operating temperature. Metal impeller withstand with more higher temperature And also what type of fluid pumped. Although polymer/rubber is more applicable in corrosive environment, it might not suitable for some material, depends on what type of polymer you use for...
  11. devaxrayz

    Acid relief valve

    Stel, following your thread above, depends on what you are trying to do, i think your condition can be accessed using one of this two solution. 1. you might want to use a Pressure Safety valve (PSV) or Pressure Relief valve (PRV)... if you do so, you are referring to wrong API standard. for...
  12. devaxrayz

    pump station design

    Ehsank, first i will answer your question 1. It is not only required but also a must to consider any piping section for a suction for pump design. This is because one of the important thing in pump design is to calculate the available NPSH (NPSHa). The suction pipe length should be as small...
  13. devaxrayz

    Direct Mixing for heating problem..

    25362, what do you mean by segregation? you mean that the condensate will not mix with the fluid? The crude oil i'm talking here is mostly consist of water (about 80 to 90%)flowing in turbulent manner. So i think steam condensate generally can be mixed with the fluid. We trying to heat this...
  14. devaxrayz

    Direct Mixing for heating problem..

    Dear all helpful member, I was trying to upgrading my oil treating facility heating system. We want to heat a crude oil steam using waste steam condensate. Heating is done by injecting the steam condensate into the crude oil stream. Downstream, the mix temperature of oil and condensate will be...
  15. devaxrayz

    Basic load Calculation for Building

    Hello my name barios. I want to ask maybe anyone of you can give me explanation about Load calculation HVAC for building using Form E-20 ( Spread sheet)
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