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  • Users: devaxrayz
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  1. 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...
  2. 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...
  3. 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...
  4. 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)
  5. devaxrayz

    Natural Convection of Pipe fitted with fin

    Dear Colleague and Guru, I would like to get some opinion for natural convection of a finned pipe. I was trying to calculated how much temperature can be dropped by simple natural convection of a pipe which is attached with radial fins. The pipe is 16" dia and the pipe length is about 500 ft...
  6. devaxrayz

    Material Selection for CO2 service

    Dear all, Like you all know that for H2S service there is a NACE MR-0175 that will determine the requirement of NACE approved material for Sour Service (H2S) depends on H2S partial pressure. My question: is there any similar kind of NACE standard/requirement or else for vapor flow contain...
  7. devaxrayz

    Tank operated above its design temperature.

    Hi all, We have a oil-water separation tank with design temperature of 200F, material is carbon steel. Due to changing in oil quality, we have to heat the oil first before entering this tank up to 270 F (70 F more than it design temperature). I know that for most material (e.g. carbon steel)...
  8. devaxrayz

    Oil-Gas Separator retention time design criteria (API 12-J spec)

    Hi all, currently i'm looking at a liquid gas separator and need to evaluate it for additional load case. based on API 12-J, the liquid capacity of a separator is primarily dependent upon the retention time of liquid in the vessel. API shows some typical value of retention time for some oil...
  9. devaxrayz

    Multiple PSV Sizing at very low pressure setting

    Hi all, Currently i'm doing some PSV sizing. The data is as follow : - vapor relieve capacity is 3 MMSCFD (12220 lb/hr) - setting pressure 0.05 psig - Z = 0.98, Mr = 36, Cp/Cv = 1.3 - The backressure is estimating at 0.01 psig While sizing i found that this is a SUBCRITICAL FLOW, and i'm run...
  10. devaxrayz

    Booster pumps fluctuating flow

    Hi all, I'm planning to install a booster pump in the middle of pipeline to transport (increase pressure) of crude oil from some treating station to shipping station. The pump capacity is 50000 BPD at 250 psig. The oil flowing in the pipeline is normally also 50000 BPD, but one of the treating...
  11. devaxrayz

    Replacing 8" Valve with 6" one

    Hi All, There is a problem where my 8" Shut Down Valve (ball) is leaking. Since we dont have the spare for 8" valve, my boss considering of using 6" ball valve which we have in warehouse, so I need to evaluate it first. this is definitely a Control Valve sizing case. The fluid is steam 580 F...
  12. devaxrayz

    Pump piping configuration

    Hi all, I am in a work of sizing pump and its pipeline. The pump discharge has 2" nozzle and the pipe sizing is 6" diameter. Which should i use : 1) Either 2" block valve, 2" check valve and then expand the line to 6" diameter or, 2) expand the line to 6" diameter and use 6" block valve and...
  13. devaxrayz

    How to specified pressure drop for orifice and control valve sizing

    Hi all, I am doing sizing of orifice and control valve. One of the data required for the sizing is pressure drop( or inlet and oulet pressure).How do I specified the pressure drop for this sizing?? (The orifice or CV is not there yet so i dont know the inlet and outlet pressure). Is there any...
  14. devaxrayz

    Insulation exposed to rain water

    Dear all, Our plant using a ceramic fiber blanket used to insulated steam line. During instalation the insulation was exposed to heavy rain water. The fiber insulation is severely wet because of that. My question: -should we replaced the insulation? what is the cause? Can we just put it in...
  15. devaxrayz

    Sand Filter Design

    Hi All... I'm curently doing a sand filter design job to separating water from solid. The filter should allow maximum 10 m3/h water flow browsing from all thread that have been posted, i've found that the Flow of water through the filter (Q) can derived from Darcy's Law which is : Q (mine is...
  16. devaxrayz

    Chemical Cleaning of Cooling Water system line

    Hi all, curently i am studying in posibillity to do a chemical cleaning in cooling water system to remove it scale. When i say cooling water system it means the whole system, incuding all piping and all hot equipment passed by the cooling water. The cooling water is sweet water downstream...
  17. devaxrayz

    S444 vs Sulphuric Acid

    ello all, I'm gonna do chemical cleaning for some tube bundle of heat exchanger. The tube was covered by red scale. I think it was iron scale coming from cooling water corrosion. The tube material was X2CrMoTi 18-2 or known in AISI standard as Stainless Steel 444 (S44400). I need to know was...
  18. devaxrayz

    Chemical Cleaning of S444

    Hello all, I'm gonna do chemical cleaning for some tube bundle of heat exchanger. The tube was covered by red scale. I think it was iron scale coming from cooling water corrosion. The tube material was X2CrMoTi 18-2 or known in AISI standard as Stainless Steel 444 (S44400). I need to know...
  19. devaxrayz

    OLD MOLSIEVE! IT IS OK TO USE?

    Hello all... I have a dead stock of molecular sieve. It's been in my logistic warehouse since maybe 15 or 20 years ago, and i'm looking for any possibilities that i can still use it. It is a 13X type molecular sieve with 1/16" pelleted grain size. I will using it for an absorption of H2O and...
  20. devaxrayz

    OLD STOCK MOLECULAR SIEVE! IS IT OK TO USE ??

    Hello all... I have a dead stock of molecular sieve. It's been in my logistic warehouse since maybe 15 or 20 years ago, and i'm looking for any possibilities that i can still use it. It is a 13X type molecular sieve with 1/16" pelleted grain size. I will using it for an absorption of H2O and...

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