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  • Users: npf
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  1. npf

    Rotary Type Oil Flooded Compressor

    All: Currently I am working on oil flooded rotary type compressor P&ID. It compresses propane vapor from 15psia at -42.5F to around 313 psia. The slide valve will operate based on suction pressure control. Could anyone expain to me this control scheme i.e what happens if pressure is too high or...
  2. npf

    Air Cooled Heat Exchanger -Fan Speed Control

    All: Currently I am working on Air Cooler P&ID. Here are the details of the air cooler- Its a forced draft, single bay, 2 fan/bay cooler. The propane vapor enters at 210F and 300psig and leaves as liquid at 120F. The deltaP across the cooler is 5 psig. The motors are of VFD type. The speed of...
  3. npf

    LPG Liquid Line Sizing

    All: I am currently working on LPG terminal project. For LPG line sizing, what pressure drop and velocity guidelines should be considered? LPG operating temperature is about-40F Also I am trying to find out the isolation philosophy to be used for isolating piping and equipments and where an...
  4. npf

    Thermal Relief Valves

    All: I am sizing thermal relief valves for liquid LNG. Typically we do not size those and use default, but the client wants to see the calcs. These valves are located on 26" diameter long and short run of piping. The pipe length is approx 1000ft and is insulated. Do we have to consider...
  5. npf

    Electro/Pneumatic Postioner

    All: I am working on P&ID's on an LNG project. I have globe valve w/ electro/pneumatic postioner(actuator). It also has a hand jack. The valve tag is HV-XXXX A 3 way solenoid valve is feeding the actuator. Could any one tell me the use of the electro/pneumatic positioner? Would a diaphragm...
  6. npf

    Control Scheme

    All: I am new to the process industry.I am working on LNG project in the development of P&ID's. I am trying to understand the logic (or undertsand how it is trying to control) for 2 valves HV-1000 and HV-500 marked w/ an arrow in the attachment. A sequence of operation would be good way to...
  7. npf

    MSD Development

    All: I am trying to develop MSD's from available PFD's. Right now we do not have equipment datasheets,We only have pipespecs available, would that information be enough for the MSD's. What other information do I need? Any help would be appreciated? Regards, npf
  8. npf

    All: How can I calculate power c

    All: How can I calculate power consumed by flow controllers- I have flow controllers installed on the air, water and fuel gas line going to the heater well. Your help would be appreciated -npf
  9. npf

    Sea Water Pumps

    All: I am in the process of determining cooling water pressure.The system basically consists of tunnel which collects water at 20m depth, the interface will be at the intake pit.There are several users and it is pumped back to the discharge tunnel. I have assumed my discharge elevation at 10m...
  10. npf

    CO2 compression

    All: I am working on a case where I have to compresss CO2 gas(97% CO2, 3% H2O) from 2 bar to 275 bar to be injected into wellhead. Right now I developed a simulation model w/ 5 stages, I have used 80% efficiency for the compressors.Also I have used intersatge coolers. I have limited my...
  11. npf

    Latent Heat

    All: How would you determine latent heat in hysys?I know its (enthalpy Hv- enthalpy liquid Hl).I am trying to do a relief valve size for fire case and I need to know the latent heat for that Montemayor: I am sorry, I did not use a new thread and I should have rephrased my question. My concern...
  12. npf

    Vapor Pressure

    All: How to determine vapor pressure using HYSYS? Also it is always true whether Critical pressure is always greater than vapor pressure. Regards, sp77
  13. npf

    Wetted Surface Area

    All: I am in the process of calculating surface area for 3 stacked shell & tube heat exchangers and hence calculate the relief rate. Shell length is 24ft and ID is 37". Should I take my total length to be 72 ft(24*3) and ID -37" and determine the surface area for horizontal cylinder. Also I am...
  14. npf

    Header Pressure

    Hello all, I am trying to determine control valve pressure drop on sour gas line. The source pressure is 15 psi ,the sour fuel gas header is at 10psig. If I have to go all the way to my battery limit, I have to determine the length and with fittings, I should be able to determine my battery...
  15. npf

    Pump Curves

    All: I have some problem on reading pump curves. I have pump curve and pump datasheet for an existing pump, I am trying to determine differential pressure for my maximum nad minimum flows. Right now the datasheet shows rated case flow, impeller size and impeller size for the max case. Does that...
  16. npf

    Heat Exchanger

    Hi, Have anyone come across Non cooling water Heat exchanger w/ stacked shells? Regards, sp77
  17. npf

    Water Saturation

    All: Could you help me in determining the amount of water(steam) required for saturating the hot air stream ? This is 100 scfm of air at 265F and 1psig. Thanks, sp77
  18. npf

    Temperature Drop across pipe

    All, We have a gas at 280F. This gas is sent to Amine unit for further polishing.If the amine unit is approx 2 miles downstream would there be any temperature drop Any help will be appreciated Regards sp
  19. npf

    Sulfur Trap

    All, I need information on Sulfur Trap. It's function, pressure ratings , availability Any help will be appreciated Regards sp
  20. npf

    Quench System

    All, I need information regarding the use of Quench System(caustic or water) to remove sulfur mist and also to cool the gas.Also is it possible to remove traces of SO2 with Quench System Any help will be appreciated Regards sp

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