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Recent content by Termodinamica

  1. Termodinamica

    What does Industry consider an acc

    What does Industry consider an acceptable pressure drop across gas coolers (process gas aftercoolers) in Interstate Gas Transmission (pipeline) service in compressor station facilities? Is there a X to Y range of Psig values or a not to exceed X% of discharge-pressure. Looking for an go-by or...
  2. Termodinamica

    Why High Temps when loading centrifugal after purge.

    Why is the compressor experiencing high temperatures in the range of 180F (RTD at discharge 10' comp. flange) when we simply gas-load the centrifugal compressor after a purge. The impellers are not turning, we are just filling in the compressor with a loading valve before opening discharge for...
  3. Termodinamica

    Rolls Royce Turbine Power Derate

    Does any one one a rule of thumb or method to derate the power on Roll Royce Gas Fired Power Turbines? I have a RR 501KC7 that Id like to Derate under 128 ft of elevation and 90F. The manufactured rated Horsepower is 7200. Any feedback will help. Thank You .
  4. Termodinamica

    Pipelien Flanges- Derate as a function of increase bolt/Stud hole diameter

    I will not take any risk or put any one else in danger. Those flanges will not be drilled under my direction. Thanks
  5. Termodinamica

    Pipelien Flanges- Derate as a function of increase bolt/Stud hole diameter

    Gentlemen, What would be the derate of a 12" 900 Series Ansi Flange if I was to increase the bolt hole diameter. Is there a table or a contact that may supply this kind of information. Additional: Pipeline application Purpose: allow additional aligining clearance Any information will really...
  6. Termodinamica

    What is the ongoing Capital cost of Compression Installation $/HP?

    Thank You BigInch. No, I did not mean "ongoing" as O&M cost. But Ill be happy to know what $/Hp-Hr value you forecast for your greenfield highspeed compression. Thank you.
  7. Termodinamica

    What is the ongoing Capital cost of Compression Installation $/HP?

    For main line gas transmission and/or gathering, what would be the ongoing cost of gas compression for highspeed-separable green field compression. Including scrubbers, gas coolers, controls,valves, station yard and the nine yards?? I have heard #s between the $1800 to $2600 doller per...
  8. Termodinamica

    Electric Driver vs Recip. (Cat) - Which driver option has the lowest installation cost?

    Understanding that OEM would provide quantitative information. What im seeking here is a general comparative cost experience you may had, that answers which driver option has been typically more economical for you? I am comparing two electric driver Toshiba,GE or Siemen vs the recip option Cat-...
  9. Termodinamica

    gas turbines

    You should access your Oems comp performance curves for the given gas gravity and suction temp. There you will see all the speed, hp, head and efficiency relationship you desire. There are general functions, but such will make you assume an efficiency value that cannot be determined w/o the...
  10. Termodinamica

    Gas Compressor Station Pressure Drop

    Very True. Not enough detail. This would be a 25,000 HP Interstate Mainline station with slow-speed integral reciprocating compressors such as Cooper Bessemer GMWs compressor at or above a 1Bcf.
  11. Termodinamica

    Gas Compressor Station Pressure Drop

    When determining the overall compression required for natural Gas across a compressor or compressor station. What Delta P drop should I used for the suction and discharge of the compressor station assuming. Is there a rule of thumb of 5psig or something of the like for each side ( suction and...
  12. Termodinamica

    Suction Temperature for sizing gas transmission compression

    Thank You So much. Very Helpful ;)
  13. Termodinamica

    Suction Temperature for sizing gas transmission compression

    Regardless of location what is a good suction temperature to size gas transmission Horsepower. If the answer depends on compressor type. I am sizing for low-speed integrals and/or high speed separable cat-ariel compression. What do you normally use 60, 70 80F?? Any help will help. Thanks.
  14. Termodinamica

    HP/MMSCFD Calculation

    In reference to compression Hp requirement as a fuction of flow and pressure ratio: Hp= T1*Zavg/11.66 * k/(k-1) *SQ/nisen *[(p2/p1)^((k-1)/k) - 1] t1=suction temp Zave= average compressibility at suctiona and discharge k= ratio of specific hears SQ=standard flow in MMSCFD Hope this was of...
  15. Termodinamica

    HP/MMSCFD Calculation

    T
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