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  1. ghoshtathagata2000

    Metering Pump Acceleration Head

    Hi, Just came accross a situation where we are having trouble with the acceleration head losses The product is Isobutane, and the mean suction pressure is 58 psi. The NPIPA without acceleration head is only 5.3 psi. Now, the length of the suction piping is 157 ft, which translates to 36 psi...
  2. ghoshtathagata2000

    Type of Pump for Liquiefied Propane

    Hi, We are working on a project handling products like propane, butane, hexane. The type of pumps being suggested is submersible canned motor (sealless). The vessel is above ground (4 ft from grade & LLL of further 1 ft) Pump flowrate is 55 gpm and TDH = 800 ft. Vessel ID = 18' 6" & TL / TL =...
  3. ghoshtathagata2000

    Non contacting pump seals

    Hi, Just received an offer for Eagle Burgmann seal applied in an API VS4 pump (vapour sealing - H2S). Selected seal plan is 74/61 (with N2 gas). So far, I knew the groove patterns are always made on the mating ring which are rotating. But to my surprise, the one selected by EB is having a...
  4. ghoshtathagata2000

    Steam turbine performance testing

    Hi, As per API 611 steam turbine (applied for boiler feedwater pump in refinery service), it is noted that performance testing is listed as an Optional test with a note that such test is usually not carried out for such equipment. Can anybody advise as to why it is not usual practice. Thanks
  5. ghoshtathagata2000

    Steam turbine performance testing

    Hi, On referring to API611 for turbine testing it is noted that 'performance test' is usually not performed. However Client's specification is asking for shop performance testing is required. Could anybody advice why usually performance testing is usually not done? Thanks
  6. ghoshtathagata2000

    Rotary Pumps

    Is the curve supplied for a rotary pump based on the stated liquid or with the test water. If so can anybody please explain how to collaborate the two figures if the curves are based on water (i.e. from water to service fluid and vice-versa)
  7. ghoshtathagata2000

    End of Curves

    Thanks for your opinions. DubMac, I checked the NPSHr curve for the pump. Even at very high flow rates the NPSH difference was very high. So I don't think NPSH was the problem 1gibson, the estimated curve was only upto 630 m3/hr but the OEM tested it at 810 m3/hr. You are very right in your...
  8. ghoshtathagata2000

    End of Curves

    It is being seen as a trend in the Middle East Oil & Gas companies specification that the drivers shall be designed for the ënd of curve operation. Also I understand that it is common practice to size the driver for end of curve also pumps operating in parallel. What is the definition of end of...
  9. ghoshtathagata2000

    Variable Speed Motor Driven Compressor

    Hi Everyone, That the trip speeds for the steam turbines, gas turbines, constant speed motors are defined in the API 617 standard for centrifugal compressors; this parameter is nowhere defined for VFD motor driven centrifugal compressors. Can anyone please suggest what values in relation to...
  10. ghoshtathagata2000

    Compressor Casing

    Hi, I am working on a project involving Refrigerant compressor with a vertically split casing. Due to the temperature of the propane gas we have been requested to use stainless steel casing. Can anybody please clarify whether the material recommendation applies to the outer or the inner...
  11. ghoshtathagata2000

    Water quality

    Hi, There is a requirement in API 610 for Centrifugal Pumps (Cl. no. 7.3.2.3) that the water quality to be used for Hydrostatic testing pumps with austenitic stainless steel materials shall not exceed 50 ppm w. Can anybody please clarify why this water quality requirement is not applicable for...
  12. ghoshtathagata2000

    Bearing Housing Vibration

    We are currently executing a project which has centrifugal pumps, centrifugal blowers, induction motors among other equipments applying Bently Neveda's bearing housing vibration monitoring. On this subject, GE has two kinds of such instruments to offer. One is the accelerometer which measures...
  13. ghoshtathagata2000

    API 650 : Appilicability for Skid Mounted Tanks

    Hi, We are doing a couple of Chemical Injection Packages viz. Anti-corrosion agent injection, anti-scalant agent injection which comprises of chemical storage tanks in 316L, metering pumps (as per API 675)etc. The tank will he sized to hold chemicals for a week or two (sizes range from 2 m3 to...
  14. ghoshtathagata2000

    Cyclone separator performance

    Hi, Could anybody explain whether there the pressure drop would vary depending on the dust accumulated near the bottom in case the dust removal is not fast enough. Is it possible to monitor the separation efficiency using a differential pressure instrument. Thanks
  15. ghoshtathagata2000

    Controller for Jockey Pumps

    Hi, Can anybody please explain whether it is mandatry for the electric motor jockey pump to have a controller of its own as per NFPA 20, As I understand the jockey pumps are pressure maintaining pumps and in case auto starting is not mandated it is not necessary to install a dediacated...

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