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  1. AlexWNZ

    Class A, B, C shutdown logic

    Hi, Yes I did reach out to a vendor and it sounds like it is just a convention based off old AMOT functionality back in the 90s (Presumably this might become a standard some day! [smile]
  2. AlexWNZ

    Class A, B, C shutdown logic

    Thanks for the feedback! There is reference to what the shutdowns do in this PLC talk thread http://www.plctalk.net/qanda/showthread.php?t=66535 Its very muchly a skid based way of thinking (i.e. how the skid gets through its sequence logic and what shutdowns are applicable when (i.e. the low...
  3. AlexWNZ

    Class A, B, C shutdown logic

    Hi All, I've been working with gas engine driven reciprocating gas compressors for a while now and I've never found which standard defines the way shutdown logic should be handled (i.e. class A, B, C shutdowns, the "B" and "b" timers etc). It seems common across a bunch of vendor control...
  4. AlexWNZ

    Recommendations for Electrical Design handbook

    Hi All, I'm interested on hearing of any recommendations that people have for a good electrical design handbook? I have the IEEE redbook and NFPA70 but am looking for one with heaps of worked examples for cable / motor protection (i.e. from cable sizing through to selection of fuse/CB settings...
  5. AlexWNZ

    Overcurrent protection for fractional HP motors in hazardous areas

    Just to clarify, the motor does have a thermistor but it is not connected in the design
  6. AlexWNZ

    Overcurrent protection for fractional HP motors in hazardous areas

    Hi All, I'm just querying a recent design I received from an engineering house which is for a 0.75kW Ex Na 400V star connected motor. The reason I am concerned is that the design does not have a dedicated overload relay. -All that is present is 3x4A fuses and a contactor (no protection against...
  7. AlexWNZ

    Horizontal recip use of rider pads?

    Hi All, We recently changed our piston design on a large horizontal reciprocating compressor to one recommended to us incorporating rider bands (one piece, not split design) to either side of the compression rings. We have since gone back to the original design as we were finding that even...
  8. AlexWNZ

    Oil in water emulsion detection

    Thanks All. Yes @Latexman it is a stable emulsion layer building up due to a combination of asphaltenes and CI (as per @georgeeverghese) We don't have a coalescing stage in our produced water system (which we believe is one of the reasons for it accumulating in this part of the process). We can...
  9. AlexWNZ

    Oil in water emulsion detection

    Hi all, Any one have any suggestions or products to use to detect oil in water emulsions? Just having some issues with emulsions accumulating in our produced water systems that we'd like to be able to detect. We are looking at the tracerco profiler but am not sure if the stated 1% SG accuracy...

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