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  1. rlewis

    first steps with API 614, need support!

    Are you designing a filter or looking for a filter ? If looking, Call indufil. They are in Europe and make most of the filters I see on API 614 systems.
  2. rlewis

    TurboCompressor Train Responsabilty

    Which vendor is prime often depends on commercial issues - i.e. what is the relative cost and complexity of the gas turbine vrs. the cost and complexity of the compressor. If the gas turbine cost is very high and the compressor relatively low, the compressor supplier may refuse to be prime or...
  3. rlewis

    Compressor stonewall

    Stonewall actually occurs when the gas chokes in the diffuser. Lighter gases have higher accoustic velocity and therefore run at much lower Mach numbers in the diffuser and will therefore require more volume flow before they choke. The lighter the gas, therefore, the less likelyhood to reach...
  4. rlewis

    Centrifugal Gas Compress Volute/Casing Temperature

    The volute total temperature and discharge total temperature should be very nearly the same. Remember that you are measuring stagnation temperature and npot total temperature, so a velocity correction is required. The diffuser and volute slow down the gas so gas velocity in the discharge may...
  5. rlewis

    internal coating for lube oil tank

    The portion of the tank which is below the oil level will not corrode, however the portion above the oil probably will. You've also got a commissioning period when the tank is empty to worry about. Corrosion products from hte tank will contaminate the oil. For this reason, in critical...
  6. rlewis

    Polytropic efficiency of turbomachinery

    For Centrifugal Compressors, the actual stage ratings are developed from test curves and converted to head and efficiency. On a Polytropic basis, the curves do not vary regardless of actual gas, whereas on an isentropic or adaibatic basis, the base rating curve would be invalid due to...
  7. rlewis

    Intermediate Blow Off valve on Axial Flow Compressor

    I can only speculate that this may have been added to unload the unit during startup. I can't imagine using it during operation.
  8. rlewis

    SUCTION STRAINERS

    How much dirt and debris is in the pipe ? Seriously, If you plan to leave the strainer in, install pressure taps so you can measure the delta P and know if it is clogged. If you are really confident that you've done a good job of cleaning pipe, you can go without the pressure taps and remove...
  9. rlewis

    Minimum suction pressure

    MInimum suction pressure really isn't a problem. You do however need to supply sufficient volumetric flow since this is what a centrifugal "sees". Dropping the suction pressure decreases gas density, and so you either handle less mass flow to keep at the same point on the curve, or move the...
  10. rlewis

    paint to cover stainless steel

    I work in the chemical industry, and we actually paint SS quite commonly to protect from chlorides. Abrasive blast is used to prepare the surface. The paint we most commonly use is an Epoxy primer and Epoxy finish. This works well. Although I can't supply you with our spec., paint...
  11. rlewis

    Abradable seal

    I would doubt whether the problem is liquid carryover unless you have significant damage to some of the first few impellers. The gas should be hot and dry by the time it gets to the balance drum. What about the binder and bonding material compatibility with your gas ? As a last resort, other...
  12. rlewis

    Mechanical seal vs. packing in oil pumps

    Sealing systems are driven by environmental regulations rather than industry standards. I don't know where you are located but we would never use packing in an oil pump. In fact, packing is rarely ever used even in water service since most water is "treated" in one way or another.
  13. rlewis

    Humidity Calculations

    sp humidity = 0.622 pv/(P-pv) Lets say you start at 50 % RH and 75 F. Steam tables at 75F give a saturation pressure of 0.4298. Since we have 50 pct RH to start, use 50 pct of this pressure or 0.2149 in the above equation. Assuming P = 14.7, this gives 0.00925 lb water / lb dry air. Now...
  14. rlewis

    Dry gas seals

    John Crane and Flowserve are the two largest suppliers for compressor seals although there are other designs. AP-614 Chapter 4 covers the support systems for these seals, and API-617 has some generic cross sections of gas seals. Gas seals come in different "flavors" including unidirectional...
  15. rlewis

    Inlet guide vanes

    Centrifugal compressors develop head as a result of the change in angular momentum of a gas. Imparting a swirl on the inlet gas therefore changes the incomming angular momentum and therefore will reduce the head developed. Actually, guide vanes also introduce a pressure drop, so their total...
  16. rlewis

    Screw Compressor Manufacturers

    Mann Turbo is a merger of companies includinhg GHH, so you already have this line listed.
  17. rlewis

    API 614

    API-614 is a standard regarding oil and auxoillary systems. Pipe vibration is not covered.

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