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Recent content by TPL

  1. TPL

    Long Stroke LInear Electric Actuators

    Thanks btrueblood,but I'm going to be restricted to using equipment that is designed and manufactured for oil and gas use, and in this case specifically, water injection pumps, using vendors that are internationally recognised such as Rotork - as far as I can tell, their linear actuators are...
  2. TPL

    Long Stroke LInear Electric Actuators

    I'm involved in a project where the discharge lines of my WI pumps are to be retrofitted with globe valves - the intent is to use pneumatic actuators to control the valves(10 inch stroke) requiring additional new air packages to be procured. I'd like to try and simplify things, asking if...
  3. TPL

    Consensus Science

    Hi David...I'm 100% with you on this. Try this one for size - see what nonsense us poor Brits have to put up with............. http://www.templar.co.uk/downloads/Lilley-Stern_Rebuttal.pdf
  4. TPL

    Measuring angular deviations of an object submersed in fuel using accelerometers

    RVDT?
  5. TPL

    Cepstrum - what is it good for?

    I remember it just as a B+K marketing/brand differential thing - their own spectrum of a spectrum technique, claimed to be be good for analysing gearbox vibration. Others that are of similar value: Kurtosis (for finding rolling element bearing faults), full spectrum (marketed by Bently Nevada -...
  6. TPL

    Prediction Gas Turbine System Reliability

    MTTF/MTBF data is just about site specific - depends largely on fuel type and quality (gas/liquid), quality of air filtration , duty (power gen/gas compression). Wash regime contributes as well. These factors can vary enormously from site to site and give widely varying MTTF/MTBF
  7. TPL

    Dry Gas seal Buffer Gas low dew point

    Somewhere in the O+M literature there will be a statement (most likely from the seal vendor but endorsed by the package supplier) along the lines of 'supply gas temperature must be at least 20 deg C above its dew point': this will ensure that there is no liquid dropout within the seal, to meet...
  8. TPL

    POSITIVE DISPLACEMENT PUMPS

    Maybe there's confusion with NPSHr?
  9. TPL

    Entropy example, Need explanation

    You need to think about what entropy really is. Basically, the universe is running down (think of it as a giant watch spring that is slowly unwinding, with no means of rewinding it). The second law of thermodynamics says that whenever energy is exchanged or converted from one form to another...
  10. TPL

    Dry Gas seal Buffer Gas low dew point

    "The moisture in the buffer gas is intended to lubricate the seal" "The adsorbed gases on graphite are an important part of it lubricant effect." Sorry guys - the working gap in a typical dry gas seal is 3 to 5 microns and you want absolutely nothing in that gap except CLEAN, DRY gas - no...
  11. TPL

    Dry Gas seal Buffer Gas low dew point

    Quote "to maintain seal supply gas at a minimum of 20° C (36° F) above dew point at the seal faces" This requirement is prevent liquid drop-out. Rule # 1 for Dry Gas Seals: They need CLEAN DRY GAS -this applies to the sealing gas and any buffer gas I fail to see how providing 'over dry' gas...
  12. TPL

    Visible gas to visually demonstrate compressed air leaks on industrial equipment?

    Use a thermal imaging camera?
  13. TPL

    Definition of 'clean' fluid

    Thanks for the your responses and apologies - I should have written things a little more clearly. The system is MEG reclamation: the first pump in the flow line is fitted with a single cartridge seal and a Plan 11 flush. The next pump in the flow line is fitted with a pressurised dual seal...
  14. TPL

    Definition of 'clean' fluid

    Does anyone have a reference which defines how 'clean' a 'clean' fluid for use in a Plan 11 system should be? I have a system where a pump fitted with a Plan 11 flush (single seal bellows) precedes a Plan 53B (pressurised dual seal bellows) and I'm not entirely sure that the Plan 11 is...
  15. TPL

    Plan 13 seal running dry at Startup

    Thanks for the replies. The vendor has told us that the seal faces are carbon graphite on silicon carbide with a low coefficient of friction which can accommodate these ‘dry’ starts as long as the pump is allowed to run for a reasonable period of time in order to remove any heat from the seal...
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