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Recent content by DiaphragmPumps

  1. DiaphragmPumps

    Self-priming pump and air-trap

    If the picture shows the correct heights, then there won't be any syphoning back into the container. Looking at the inlet port It shows an above centre line inlet, therefore it is most likely a self priming unit. As the Inlet pipe will be full to the level of water in the tank, there will not be...
  2. DiaphragmPumps

    Acceleration head

    1)There wouldn't be a lot of point having a pump, if the pressures were the same or the inlet was higher than the discharge. 2)Glycerin filled gauges are ideal for filtering out the pulses. 3) Acceleration Head is not a term I have heard, but symptoms come under many titles. Are you referring to...
  3. DiaphragmPumps

    Operating of reciprocating pump

    Some confusing answers, I hope I can clarify. If you have a piston pump for example, the pressure capability will be based on the build of the unit and the size of the motor driving it. so it is perfectly acceptable to run this pump at 5 bar,should however the pipe block, you have a lot of...
  4. DiaphragmPumps

    Self-priming pumps - how do they work?

    Self priming pumps generally all use the same principle of reducing the pressure on the suction side, so atmospheric pressure pushes the product into the pump. Centrif's generally have a trap in the volute as described above, which holds a small amount of liquid, so upon starting this liquid is...
  5. DiaphragmPumps

    PD vs Centrifugal pumps

    Some General Points Centrif's give velocity to a liquid and are therefore affected more by variations in Back Pressure than PD Pumps, Hence 2 Centrifs in parallel will have a much reduced performance. PD Pumps as the name implies move a set volume of liquid in relation to their rpm/stroke as...
  6. DiaphragmPumps

    Variable Flow Pump Question...

    My rule of thumb is to keep the velocity between 0.8 and 1.2 metres per second, I calculate yours at 0.82 m/s so should be ok. Of course the S.G. will affect this but without knowing exactly you may have to 'suck it and see' :) Good luck
  7. DiaphragmPumps

    Dampener for reciprocating pump discharge

    I use Blacoh's website, the formula is dowloadable from http://www.blacoh.com/docs/L-900.XLS Regards
  8. DiaphragmPumps

    Pump head increased... How??

    Also buying a cheap inverter and ramping up your Hz is an option
  9. DiaphragmPumps

    Can't find pump 2.5GPM,175psi,12vdc for seawater

    Try http://www.shurflo.com or http://www.flojet.com
  10. DiaphragmPumps

    Pump Selection, Lakes and Ponds

    If the barrier is fabric and doesn't create a friction loss and the levels are the same then you wont need a pump it'll go on it's own
  11. DiaphragmPumps

    Inexpensive pump

    A bit vague in your requirements but try shurflo or flojet
  12. DiaphragmPumps

    assistance needed

    PVDF Diaphragm Pump with PTFE Elastomers would probably be fine
  13. DiaphragmPumps

    assistance needed

    Depends on the concentration of H2So4 and the temperature
  14. DiaphragmPumps

    PUMPING FOAM

    You have to be careful, particularly on the Suction side as you will de-aerate your product if the suction is too high pulling all the gas 1st then the liquid. I would suggest as an option to the above types of Pump, as Air Operated Diaphragm Pump http://www.pump-shop.co.uk/hygienic.htm Regards
  15. DiaphragmPumps

    Looking for large dia o-ring

    You dont mention if this O ring is for a static or dynamic seal.. In static seals the superglued ones can be ok, but I try to avoid them in moving applications. These people have a 30" O ring listed http://www.applerubber.com/include/pdf/oringsiz.pdf
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