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  1. MacMcMacmac

    Exhauster Performance Estimation for Gas Turbine Altitude Testing

    Good Day. Here is a rather long-winded explanation of my issue, and a request for assistance if you have a spare few minutes. We have had a failure on our 2MW exhauster set. Last year, we spent quite a lot of time and money getting one of our 1350hp motors on this unit to within acceptable...
  2. MacMcMacmac

    Online Cleaning of Compressor Impellers

    Hello. I was wondering if there is an approved method of cleaning centrifugal compressor rotors while in service. Our main 8MW compressor is once again experiencing a build up of material on the 4th stage impeller due to a leak in the 3rd to 4th stage intercooler. The corrosion inhibitor is...
  3. MacMcMacmac

    Magnetic Center of 1MW Wound Rotor Motor

    thread237-507222 In reference to the above thread: The 1MW, 1780rpm wound rotor motor is experiencing excessive axial vibration after overhaul to replace D.E. bearing which failed due to a lack of lubrication. A year on, and this issue has not been solved. The Hail Mary play was to take out...
  4. MacMcMacmac

    Glycol Issue Closed loop

    Hello again. We just shut down for our annual maintenance an I was greeted with the following mess. Glycol was replaced in 2014 with GE Corrshield 4404. Unit is a Munters CargoCaire dehydration unit utilizing a Carrier chiller to remove heat from the system. Just wondering if anyone has...
  5. MacMcMacmac

    General Guidance on Babbitt Bearing Running Temperatures.

    Good Day. We have a large turbo exhauster here that we are trying to solve a vibration issue on. It will peg the vibration monitoring meter at startup, but gradually level out within acceptable limits after running for an hour or so. We are trying out various theories as to why the vibration has...
  6. MacMcMacmac

    Magnetic Center of 1MW motor

    Good Day. We recently received our 1MW motor back from a re-bearing job. The DE bearing burnt up due to a lack of lubrication. It is a double spherical roller bearing that is lubricated through a port on a center groove machined into the periphery of the race. To me at least, it looked as though...
  7. MacMcMacmac

    Proper Bearing Lubrication

    Good Day folks. I have recently experienced the failure of a drive end bearing on a 1350hp, 1750rpm drive motor, powering the first stage of a 2MW exhauster through a gearbox. This motor was overhauled in 2019. It has not been run very extensively since we are in a research facility which has...
  8. MacMcMacmac

    Pony Motor Starting Without Pony Motor

    Good Day Folks. I will not resurrect a thread form 2017 since doing so tends to annoy people, so I will post the URL for the previous discussion and reference the points brought up in the thread. https://www.eng-tips.com/viewthread.cfm?qid=425800&msclkid=91f8a832cf8a11ec87a484c6f4c25680 In...
  9. MacMcMacmac

    Energy Reclamation Project

    Good Day Folks. I am trying to get some buy in for an energy reclamation project at our gas turbine engine test facility. We have a 2500hp centrifugal blower that provides air for the test cell. It also drives an 1800hp turbo expander. By mixing hot and cold streams, we can get the air...
  10. MacMcMacmac

    Running 7.5hp Motor Overfrequency with VFD to Maximize Fan Performance.

    Good Day Everyone, We are trying to solve an issue with a large dehydration unit. We are finding that our reactivation blower which draws heated air through a Munters CargoCaire honeycomb dehydration wheel is not creating the proper pressure drop across the wheel. The wheel is not plugged or...
  11. MacMcMacmac

    Filter Sizing

    Good Day Folks, Just wanting a little guidance on filter sizing for an upcoming installation for a combustion test cell. Some background: About a year ago I was asked to procure a vortex oil/water separator for a pair of reciprocating compressors (Worthington BDC). To size the separator, I...
  12. MacMcMacmac

    Frick screws for air compression?

    We are currently searching for a pair of ~4500cfm compressors to replace 1950's vintage Worthington BDC reciprocating compressors that are becoming somewhat expensive to keep running. These are 1250hp, 14" stroke 3 stage units that provide air for our research facilities. In that capacity, they...
  13. MacMcMacmac

    Water Rheostat Cooling Issues

    Hello. I am currently in the middle of a repair on a pair of three-phase water rheostats. They are used as a soft-start for a pair of 1300hp, 2300V wound-rotor motors which drive two separate stages of a 2MW exhauster. As a routine maintenance task, I recently removed 4 mild steel tube bundles...
  14. MacMcMacmac

    Catastrophic Failure Containment Capability of Turbomachinery

    Good Day, We are currently doing a detailed HPP (Hazard Prevention Plan) here at our gas turbine research facility we need to know if there is an engineering standard to which turbomachinery is designed so that in the event of a catastrophic failure (i.e. rotor disintegration or blade failure)...
  15. MacMcMacmac

    Dryer Vessel Desiccant Charge.

    Hi folks. I recently opened up our desiccant dryer to investigate why the pressure drop across the beds has risen dramatically, and why I am finding a lot of dust in the after filters. I found that previous maintenance crews had installed a flat baffle plate on the top of the desiccant charge to...
  16. MacMcMacmac

    Recommendations for a Reliable Compressor from a Reputable Firm.

    I am in the early stages of seeking out a new compressor to replace our current 50 year old unit. The compressor we have right now is the original 10 stage, 8MW, 32,000cfm (40lbs/sec) unit provided by GEC England, to provide air for our supersonic blowdown wind tunnel. While it has provided a...
  17. MacMcMacmac

    Back pressure valve in Centrifugal Compressor

    Hello. Forgive me, I first posted this in the Chemical Engineering forum by mistake. I am an operator/maintenance person at a compressor plant which provides 300psi dry air to a supersonic blowdown windtunnel. The unit in question is a 10 stage centrifugal GEC compressor, built in roughly...

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