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  1. Pumpsonly

    CONTROLLED VOLUME PUMP

    Lost Motion Mechanism.
  2. Pumpsonly

    CONTROLLED VOLUME PUMP

    It should be "Loss motion mechanism". It is a type of plunger return action design by a spring instead of the cam pulling it on the suction stroke. Typically used for low cost design application.
  3. Pumpsonly

    Axial Flow pump - Flow / BHP

    This may be out of topic. Another commonly confused terminology is the specific speed Ns. Commonly referred to as pump specific speed which is only correct for a single stage pump. The actual reference should be to the impeller design or geometry.
  4. Pumpsonly

    Reason for specifying suction pressure

    Suction pressure also decide type of pump to use. End suction or over hung pump has lower suction pressure capability than between bearing pump. A high suction pressure system can have low NPSHa due to the high vapour pressure of the liquid.
  5. Pumpsonly

    VENDOR TO ADD MINIMUM CONTINUOUS REQUIRED, 30% ??

    Your client need some education on pump operation. To add 30% to the rated flow for such a big pump is a waste of 30% extra energy necessary to do the job. It means 642 gpm of water is being dump back to the suction. You can check it easily with the require motor power at 2140 gpm and 2782 gpm...
  6. Pumpsonly

    10% head rise to shutoff

    Most of the postings have concentrating on the pump curve shape. For parallel operation need to look at the system curve also. If the system curve is steep ( mostly friction), the % head rise is not so critical. If the system curve is relatively flat, (short piping , low friction and high...
  7. Pumpsonly

    PUMP SYSTEM TDH 1100 m, Q= 1020 m3/Hr

    Victor, You did not mention how is the setup. Is it a pipe line installation where the head is mainly friction or a high pressure inject. If it is a long pipe line installation, where the head is mainly friction, 2 stations installation will required lower pressure piping and cost of the pipe...
  8. Pumpsonly

    determining suction and delivery lines of centrifuagal pump

    Thunderspeed, you already provided the answer your self in your 24-Aug post. It is easy to identify the the suction and discharge for an end suction pump. But not that simple for vertical inline pump, Multistage, axial split case, VS6 type. Here the OP mentioned about a complete mounted system.
  9. Pumpsonly

    ISO and ASME pumps

    To begin with, ASME 73.1 will have imperial (inch) as dimension. ISO 2858/5199 pumps will have metric (mm) as dimension.
  10. Pumpsonly

    overloaded pump

    Post the pump performance curve and everything will be clear.Looks like a over sized pump with an under sized motor.
  11. Pumpsonly

    Plan 52 buffer fluid changing

    For Plan 53s, because the barrier fluid is pressurised, it does not get contaminated by the pumped liquid. You refill it when the pressure is almost reaching the the seal chamber pressure. For Plan 52,the pump liquid gets into the reservoir and mixed with the buffer fluid. If the pumped liquid...
  12. Pumpsonly

    VFD application on Pump

    The HTF pump may able to benefit from VFD because it is mostly friction head. But for the BFP, as BigInch explained, it is mostly static head (pressure),It is a relatively flat system curve. You need to maintain the pump discharge pressure at 110 Bar + piping friction loss at what ever flow...
  13. Pumpsonly

    Flygt VS ShinMaywa sump pumps

    One is using 5 HP and the other is using 10HP yet is cheaper. If both are rated for the same flow and head. The 10HP pump is definitely very much lower in efficiency and build quality.
  14. Pumpsonly

    VFD application on Pump

    I had came across pump specification prepared by a world re-known engineering company asking for VFD for a centrifugal pump rated for 25 meter head with a 5.5kW motor [ponder]
  15. Pumpsonly

    Pump on Stilt with spring and sliding pads

    Thanks for all your valuable input. I personally prefer the traditional solid foundation. But for this case, because of the short suction piping space,there are limitation to design a more flexible piping. Because the pump is center line mounted,the vendor can just use one of their standard API...
  16. Pumpsonly

    Pump on Stilt with spring and sliding pads

    The pump is not a API 610 spec. Just a ISO standard end-suction pump with center line casing mounting. Decided to use API spec baseplate for rigidity due to elevated support on stilts. See attached similar arrangement from Flowserve and Goulds. It was a HI suggested solution for piping thermal...
  17. Pumpsonly

    Pump on Stilt with spring and sliding pads

    I can find a few stilts only vendor but not with the springs and the sliding pads.
  18. Pumpsonly

    Pump on Stilt with spring and sliding pads

    DubMac Thanks for your input. I had experience with the inertial baseplate or inertial block for the HVAC industry for high rise building where equipment are installed at high floor level. We mount the concrete filled baseplate , like a grouted baseplate or an inertial block,which is 2-3 time...
  19. Pumpsonly

    Pump on Stilt with spring and sliding pads

    Hi, I have a requirement to mount a pump on Stilts with springs and sliding pads for the following reasons which can be found in the HI web site. http://www.pumps.org/content_detail.aspx?id=3992 · Spring mounted bases provide vertical displacement under applied loads...
  20. Pumpsonly

    Eccentric reducer

    The main concern in selecting type of reducer in pipe line is to eliminate air pocket in the pipe line. If your pipe run is horizontal or lower than the reducer, you use flat top. If going up wards , you use flat bottom or concentric. Concentric may not allow you to drain the pipe completely.

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