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Recent content by MFJewell

  1. MFJewell

    Acronyms for Drawing Types

    To be clear, the drawing would still be called a plot plan, however, the document/drawing number would be something in the form of xxx-PP-xxx so that someone could intuitively know the drawing is a plot plan if they are familiar with the numbering system.
  2. MFJewell

    Acronyms for Drawing Types

    I used to have a list of acronyms for drawing types to be used when numbering drawings. I can't find the list. A few I remember are listed below. Does anyone have a longer list or something similar? Drawing Codes GA General Arrangement ISO Piping Isometric PFD Process Flow Diagram PID Piping...
  3. MFJewell

    High Amps on Chiller Compressor Motor

    Most likely 13-14,000 GPM when we were running it before based on amp draw. A little side note, operations attempted to do a test and force as much water through it as they could. They then started a second pump with no other chillers online and blew out the division plate. It bent a 1" thick...
  4. MFJewell

    High Amps on Chiller Compressor Motor

    Found the problem, an incorrectly ranged flowmeter based on logic changes during the annual (set to 15,000 gpm rather than 25,000). We ended up using an ultrasonic meter on the pipe, ran the unit and saw the discrepancy. Reranged the meter to the correct setting and the unit performs as expected.
  5. MFJewell

    High Amps on Chiller Compressor Motor

    Correct, except that the condenser and chilled water control valves are pretty much constant throughout the range of operation.
  6. MFJewell

    High Amps on Chiller Compressor Motor

    No VFD. As stated above, the unit is set-up to meet a chilled water leaving temp demand. Guide vanes will go more open as needed to meet that temp and make tonnage. Chilled water valve typically goes 100% open, condenser water valve typically 36-38%. One other item we haven't fully...
  7. MFJewell

    High Amps on Chiller Compressor Motor

    Confirmed that the motor is turning in the correct direction.
  8. MFJewell

    High Amps on Chiller Compressor Motor

    I have that one and the original one from when the unit was installed.
  9. MFJewell

    High Amps on Chiller Compressor Motor

    Controls are set-up to meet chilled water leaving temp. The unit backs off when it gets high amps though. If the amps weren't going high, the unit would continue to load up and the CVs for both condenser water and chilled water would open further. Suction and discharge pressures are nearly the...
  10. MFJewell

    High Amps on Chiller Compressor Motor

    It was converted by Carrier (along with two of our other units) to run 134A about 10-15 years ago. The performance guarantee was 4900 tons. We regularly get 4400-4800 tons from the converted machines. This particular unit was making as much as 4700 before this loss of performance.
  11. MFJewell

    High Amps on Chiller Compressor Motor

    Motor checked out good. We pulled almost 1800 pounds of refrigerant out of the machine and still couldn't make tonnage (limiting on suction pressure). Put about 400 pounds back in to get suction pressure up, but still can't make tonnage (limiting on amps). Starting to suspect I may have an...
  12. MFJewell

    High Amps on Chiller Compressor Motor

    My plant electrician is out this week, so not sure of the voltage.
  13. MFJewell

    High Amps on Chiller Compressor Motor

    I am experiencing an issue with one of the chillers at my facility and am looking for some insight. The unit is a 1974 vintage Carrier 17DA unit. It is nominally 5000 tons (holds 15,000 pounds of R-134A). We took it down for maintenance and have been experiencing 100+ amps higher draw on the...
  14. MFJewell

    Determining the inlet and outlet pressure for automatic flow control valve

    You should have a discharge pressure gauge at the discharge of the pump, use it. Check TP-410 for the calculation. It's fairly straight forward. Here is a calc I did for something similar. [ur]https://www.eng-tips.com/viewthread.cfm?qid=430771[/url]
  15. MFJewell

    Gas Turbine Installation

    Depends, GE is starving for business and I'm sure MHPS/P&W would love more orders and with their swiftpacs, they can usually deliver quickly. It would also depend on what the cancellation penalty is with Siemens. Completely agreed. I question who is handling the engineering. Is it Siemens, the...
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