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  1. nesamani1983

    gas pipeline grid pressure reduction

    Hi, Assume that the entity (A) is operating a gas pipelines grid of 900 km long at 50 kg/cm2. Gas is transferred to Another entity (B) at Dispatch terminal (DT), where B has compresser to take gas, at 50 kg/cm2, B transfers the gas to their pipeline network of 2000 km.. Flow is 120000 MMBTU...
  2. nesamani1983

    Gas pipeline venting flow calculation

    We have a 20 inch, 41 km of natural gas pipeline, which needs to be pigged by ILI tool. The pipeline has no gas flow. Hence pigging is planned by venting the gas at receiver end. The ILI vendor informed that the pipeline shall be filled to 15 bar, before launching the PIG. venting is planned by...
  3. nesamani1983

    Gas terminal piping integrity assessment

    Hi all, I am working in Gas pipeline transportation, has cross country pipelines and terminals. I have below doubts 1) Is there any way to find the terminal pipe grade? any survey . Because in old terminals, pipe/bend materials used are of different thickness than the A333 or A106 Gr B. Also...
  4. nesamani1983

    Hydrotest pressure drop analysis

    Hi all, We have natural gas Pipeline laid in 1997. Pigging is done quarterly. API 5L X46 PIPE. Wall thickness= 4.36 mm. We have done the hydrotest of 4'' 2.61 km long in service natural gas pipeline. The test pressure kept as 15 kg/cm2. But the pressure started dropping, to reach 10.8 kg/cm2. I...
  5. nesamani1983

    LPG Liquid expansion turbine??

    We are operating cross country LPG pipeline system. We have PRV, to reduce the pressure of LPG from 20 Kg/cm2 to 9 kg/cm2. But i feel that we can replace the PRV with Turbine expander, which will letdown the pr & produce electricity. Does my idea work...? Can someone help me in turbineexpander...
  6. nesamani1983

    Do we need the min. flow re-circulation line..?

    We have the VSD driven LPG pumps(270 m3/hr & I/L pr=20 O/L pr=70 Kg/cm2 ). As per the operation seq, disch. valve will start open after 50 secs & speed set has reached. For ex. if 2500 rpm, is set then disch. valve will start open after the pump reaches the 2500 rpm. Valve opening time is 35...
  7. nesamani1983

    LPG flushing by water

    We are operating the cross country LPG pipeline. We have Filter , pumps. During maintenance of filter, we isolate the filter and flare LPG, to empty the filter. I came to know that we can flush the filter with the high pr. water. LPG can be transfered to the process piping, then isolate the...
  8. nesamani1983

    Online Pump curve developer

    We have the pump curve( Flow Vs Head & Efficiency) given by OEM. I want the system or software, which will have the curve installed. Also which will show me the online live values of flow, head and efficiency. So that i can know, which point i m operating the pump? Here, the input data can be...
  9. nesamani1983

    LPG Transfer system

    Dear all, Is there a movable system(has suction strainer, LPG pump(disch. pr > 25 Kg/cm2 & flow can be less)in trolley) . We have the LPG cross country Pipeline. during maintenance of the pumps & filter, huge qty of LPG is flared. I want the system to transfer this LPG into the process...
  10. nesamani1983

    MOV not opening fully

    Dear All, Refer the attached dwg. During the pump starting, as per the starting sequence(defined), when speed reaches the set point, discharge MOV has to open.Total MOV opening time is 35 secs. But in pumps-B & C , MOV-11 & 12 doesnt open fully. MOV stops in the half open position.Ball valve...
  11. nesamani1983

    MOV not opening fully

    Dear All, Refer the attached dwg. During the pump starting, as per the starting sequence(defined), when speed reaches the set point, discharge MOV has to open.Total MOV opening time is 35 secs. But in pumps-B & C , MOV-11 & 12 doesnt open fully. MOV stops in the half open position.Ball valve...

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