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  • Users: wimple
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  1. wimple

    Polytropic Head

    TPL, You are right, however here we are talking about OEM value that is 1.5 times greater than calculated Head... Regards Wimple
  2. wimple

    Heat Transfer Finite Difference Modeling

    hello You can program it using Finite Difference Method described in Suhas V. Patankar Book. you could use Fortran as the book contains sample programs in this language. You could use one dimension model as the pipe is symetric. You would consider a segment with a set of discrete nodes located...
  3. wimple

    Increase pressure in a compressor

    I am sorry, but you do not provide any consistant details for compressor to let us help you To estimate the axial thrust of overhung compressor is serious matter. going with such crude rule of thumb you are at risk that what you expect is one order of magnitude of actual. please attach a...
  4. wimple

    Increase pressure in a compressor

    you did not advise wether your comppressor is API compliant or not. Lower speed means lower then your acual rated speed.
  5. wimple

    Increase pressure in a compressor

    Hi Basically with the changes, you run with quite lower head and therefore lower speed (less 70 % ??). Very generally speaking, you need to check new operating speed versus the Critical ones (speration margin) versus code (API if applicable?) There are other points to check...you need to...
  6. wimple

    Compressor Coolers (increase in gas flow)???

    quoted Therefore, if the shiller is upstream the compressor, cooling down the gas will reduce volume flow from V0 to V1. In order to get back to V1 you need to increase mass flow and consider the appropriate equation of state e.g BWRS for natural gas. unquoted I meant get back from V1 to V0...
  7. wimple

    Compressor Coolers (increase in gas flow)???

    Hi Is the chiller to be located upstream or downstream the compressor? I beileve we need to distinguish mass flow and volume flow. Volume flow is basicaly dependant on pressure and temperature and MW. At constant mass flow : Pressure increase >> Volume flow decrease Temperature increase >>...
  8. wimple

    TurboCompressor Train Responsabilty

    Thanks All for your valuable answers Best regards Wimple
  9. wimple

    TurboCompressor Train Responsabilty

    Hi In case of turbocompressor trains (API617), I would ask for your insight to clarify the following : 1 - Single Source : Is this mean that Each equipment, Gas Turbine and Compressor, are both provided from the same Manufacturer. This leads Ipso Facto to Single Responsability. 2 - Not...
  10. wimple

    Altitude correction to pump performance curve

    BigInch I agree with you. What about the following scenario : the pump is quoted at sea level. There is sufficient NPSH margin for operation. The design of the pump is frozen in these conditions. Then the pump is relocated (at higher altitude) leading to lower NPSH margin. Is it possible...
  11. wimple

    Centrifugal Pump Suction Problem

    Hi Just question, why you say speed reducer and not speed increaser? How would you recognize the position of pinion if it is on top or bottom? Thanks Rgds Wimple
  12. wimple

    Altitude correction to pump performance curve

    Hi I guess the NPSHr is given by Mfr accounting for 3% losses of head. In case the altitude increase, the NPSHa will tend to decrease. One need to check if at higher altitude, NPSHa is still above (NPSHr + margin). If not, pump is likely to experience cavitation, leading to additionnal %...
  13. wimple

    Vertical pump impellor damage, Water service

    sbeville A possible explanation is to look for ppm content of NH4 in the water. Particular combination of pump material (impeller, casing etc) could activate galvanic corrosion on pump impeller as it bronze which has the lowest electrolytic potential. When it happens It does the job very fast...
  14. wimple

    How to find the thickness of pipe after bending

    athomas236 Refering to your comment "is the bend as strong as the straight". I would ask you as well what is typical L to D ratio of the pipe to consider it is the case? Thanks Rgds Wimple
  15. wimple

    How to find the thickness of pipe after bending

    athomas236 Do you mean FEA Analysis to estimate deformations and Stress of the Pipe under loading conditions to check against allowable limit, or do you mean FEA to estimate the pipe thickness after bending ? Rgds Wimple
  16. wimple

    Compressor selection

    Of course 50 HP we are talking about "Gas power". No Mechanical losses included. Rgds Wimple
  17. wimple

    Compressor selection

    consider the answer HP I submitted is the correct one Dcasto is correct as well. thats it rgds wimple
  18. wimple

    Low capacity Diaphragm pump - sizing suction and discharge

    I had a similar cas once for selecting a pump feeding a tank at low flow and relatively moderate pressure (About 110 m if I remember well). The OP was positionned in the lower limit of classical multistage horizontal pumps and we declined. In fact it was needed a eccentric screw pumps to perform...
  19. wimple

    How to find the thickness of pipe after bending

    racookpe1978 I guess that your point, is to clearly avoid use of calculation/simulations to guess the thickness? you are considering that measurement (e.g. NDT) is almost the only proper way. Do you confirm? Frankly speaking, I am not specialist of such problems. I have suggested FEM, as it is...
  20. wimple

    Pump shaft and impeller

    Consider also in the design the possibility that impeller run in reverse direction... wimple

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