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  • Users: tgmcg
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  1. tgmcg

    Problem with venturi flow meter

    thread698-332862 I am analyzing the performance of a centrifugal gas compressor equipped with a venturi flow element in the compressor discharge line. Gas MW = 11 (H2 + CO2). Flowing pressure = 650 psig. Flowing T = 340ºF. The venturi is about 30 years old. The compressor is connected in series...
  2. tgmcg

    Unexplained torque output from large VFDs

    I'm working on a project where we are planning to replace an older, non-supported VFD with a new VFD of similar 12-pulse LCI-type archtecture. The motor and driven equipment (centrifugal pump...>10,000 HP) remain unchanged. Reading through the original test report for the motor and VFD issued by...
  3. tgmcg

    Output signal from Bently Nevada monitors

    I plan to purchase a portable vibration analyzer for performing diagnostics on rotating machinery. Most machinery I work with is equipped with a permanently installed vibration monitoring system, such as the GE Bently Nevada 3000 & 7000 series systems. Most large turbomachines are equipped with...
  4. tgmcg

    Low-ratio gearboxes

    I'm looking for a standard ANSI/AGMA type gearbox providing a speed reduction ratio of approx 1.5:1. Rated power range between 5-20 kW. Input speed = 3600 rpm. In-line shaft design is strongly preferred over parallel shaft or right angle, which I know can handle lower ratios. I strongly prefer...
  5. tgmcg

    Saildrive engine mount dimensions

    I'm looking for drawings/dimensions of the foundation bolt plan for small marine diesel engines (Volvo-Penta, Yanmar, etc), plus the dimensions of the interface flange between the rear end of the engine and the upper gearbox housing for the rear stern drive unit. Will also need dimensions of the...
  6. tgmcg

    Liquid carryover to centrifugal compressor

    We recently conducted a performance test on a 1960's-vintage, 7,000 HP, high-pressure centrifugal H2 recycle compressor compressing saturated refinery H2 with MW=10 (approx). Compressor operating speed is between 7,500-9,500 rpm. Per factory PTC-10 test curves, the peak efficiency is only 73%...
  7. tgmcg

    Electronic valve actuators

    We want to build a prototype engine for development purposes while providing maximum control over intake and exhaust valve timing. It would seem that electronic intake and exhaust valve actuators would provide maximum flexbility. We are looking for suppliers of actuators and electronic controls...
  8. tgmcg

    Routing PSV outlet to compressor suction header

    Environmental regulations require than any new PSV's on our refinery hydrogen system be routed to a closed relief system. We are planning modifications of our reciprocating booster compressor plant (46,000 HP total) which requires we install new PSV's on a few of the compressors. Existing...
  9. tgmcg

    SolidWorks on a Macintosh

    Has anyone had any success running SolidWorks on one of the new Macs under Windows XP?
  10. tgmcg

    17-4PH compressor impellers

    Does anyone here have any operating experience with 17-4PH compressor impellers in H2S service?
  11. tgmcg

    PRV for high pressure H2 recycle loop

    I am looking for a PRV suitable for protection of a high-pressure hydrotreater recycle loop operating between approx 3200 psig inlet and 2600 psig outlet. Process gas is refinery hydrogen with MW between 3-6. The wrinkle with this application is that we would like to relieve to a lower pressure...
  12. tgmcg

    Integrally-geared compressors for process gas service

    I'm looking for some user feedback on direct experience with integrally-geared centrifugal compressors in process gas application, preferrably refinery or upstream oil & gas service. What was the service, when were they installed. Have they performed reliably..if not, why not? Thank you. Best...
  13. tgmcg

    High-speed ASD motor for compressor drive

    We are evaluating the use of high-speed ASD motors for use as centrifugal compressor drivers. A sister facility has installed 2 x 3500 HP @ 11,000 rpm in a similar application. The drives were manufactured by ASI/Robicon and the motors by Ansaldo. They have performed very reliably for the past...
  14. tgmcg

    Turbine exhaust steam quality

    I'm looking for suggestions regarding the minimum recommended exhaust steam quality (for a condensiing steam turbine..obviously) consistent with a 3 year uninterrupted run without experiencing significant loss of turbine efficiency. The objective is to limit blade erosion caused by condensed...
  15. tgmcg

    High-pressure steam generator

    I'm looking for some suggestions as to the best type of heat exchanger to use for the following application. We wish to generate saturated steam at pressures between 250-1000 psig through heat transfer with hot, high-pressure effluent from a chemical process. The effluent from the chemical...
  16. tgmcg

    Dimensioning of profiled surfaces

    I'm relatively new to the ASME Y14.5 and have been using SolidWorks for a year. We're outsourcing some investment cast aluminum parts which require secondary machining. While we can assign dimensions and tolerances for the machined features (holes) on the drawing, we are a bit puzzled as to how...
  17. tgmcg

    Fatigue strength of thermoplastics

    I'm designing some machine elements that are subject to fully-reversed alternating loads. The parts were originally milled from various grades of aluminum, eg. 6061-T6, 7075. Peak stresses per FEA are below 5ksi. We have design flexibility to reduce stresses even further. I'm considering...
  18. tgmcg

    Bearing support stiffness

    I'm looking for info on the range of bearing support stiffnesses that might apply to 2000 HP, 6-stage, barrel-type centrifugal compressor running at 10,000 rpm. Not bearing stiffness, but the Kxx & Kyy stiffnesses of the bearing housings themselves. I'm performing a rotordynamic analysis of...
  19. tgmcg

    Selection of aluminum casting process

    Hi, I have some very basic questions and will appreciate any and all help. We're tooling up for production of a new product we've developed. The product can be seen at (www.tailboats.com) There are three of four major aluminum parts that should probably be made using some form of casting...
  20. tgmcg

    3D impeller

    I'm trying to model the vanes on a 3D unshrouded centrfugal impeller. The disk & hub is a simple revolve. Ideally, the vanes would be a thickened lofted surface whose profiles are simple straight lines normal to a 3D spline guide curve on the revolved face of the disk. Unfortunately, SW...

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