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  1. pumpkind

    End of Curves

    Before you made the decision, consult with Process Engineers if the equipment will be commisioned with water - it is extremely relevant especially when the process fluid density is much lower that the water
  2. pumpkind

    Is a throat bushing mandatory on API 610 Pumps

    Please understand something - API 610 IS NOT A SET OF MANDATORY REQUIREMENTS - any provision can be negociated /changed/deleted as per Client's specific requirements With regard to the open impeller - technically API 610 does not refer to pumps equipped with open impellers - however, I did once...
  3. pumpkind

    Definition of 'clean' fluid

    I subscribe to the answer you have received from Pumpsonly - the combination shall work fine - the seal faces do not get process fluid at all because the barrier fluid has a higher pressure , therefore the fluid passes the seal faces in the opposite direction (against) to plan 11 flow
  4. pumpkind

    Dry well submersible pumps

    One way to get a better answer will be to identify the manufacturer of the 2 existing pumps and put a question to them
  5. pumpkind

    DO MAG-COUPLINGS SLIP?

    Even the permanent magnets do have a slip - with every slight change in pressure or conditions of the pumped fluid or with every slight speed change of the motor. To prove this it will be probably be enough to monitor the temperature of the pump in the magnetic coupling area because the slippage...
  6. pumpkind

    API Flush Plan for HSRN and RCO

    It is in my opinion an unfortunate decision - this pump will experience temperature shocks at every change of duty - apart from the case itself and all the wet components - how will the bearing and coupling alignment cope with this ? The seal faces ? How will the seal plan switch over be...
  7. pumpkind

    What's the maximum size of orifice for minimum flow line?

    As a rule of thumb (also used by few reputable petrochem companies ) , up to 15 kW installed power it is considered more efficient to have a permanent recirculation line fitted with an orifice. ( in which case the recirculation constant flow needs to be added to the required process duty )
  8. pumpkind

    High Head Low Flow - Opinions

    As already explained, Sundyne vertical turbine pump is a niche product which as far as I know does not have a real competition. For a similar set of duties, most other manufacturers will recommend a multistage pump - I was once offerred a 14 stage pump to 'replace' a Sundyne ...it is really no...
  9. pumpkind

    How to maximize load on a pump?

    If my understanding is correct - you wish to see the maximum electrical power consummed by the pump - in this case you've got your answer from quark - moving the pump duty point at the right side of the curve translate into maximum electrical power needed CAREFUL - that also translate into more...
  10. pumpkind

    Canned motor pumps in "dirty" service.

    In order to get some protection to the existing pumps and to asess the nature and magnitude of the 'dirt' problem, use a dual filter system with a switch-over function placed in the suction pipe of the pumps. If the size of the particles found on these filters xceeds tolerable sizes and/or...
  11. pumpkind

    NPSH REQUIRED Relationship to Impeller Diameter

    The curve given by the Manufacturer is valid for all the listed impellers. Use the relevant data at the flow provided by the pump with the new impeller.
  12. pumpkind

    Pump piping configuration

    Just remember, if the existing pump is designed for the velocity associated with a 2 " discharge - there shall be no problem for the valve either
  13. pumpkind

    Pump piping configuration

    If indeed you are in no position to query why a 6 " discharge piping is used on a 2 " pump - as rightly Artisi has pointed out - there is no economical uncertainty about the valve -> 2 " is vastly cheaper than 6 " valve and there is no engineering advantage to go for the bigger valve in this...
  14. pumpkind

    97/23 PED directive

    If API 610 provisions are anything to compare with, please note that stamping is specifically NOT required for pumps - see API 61O - 2.2.1
  15. pumpkind

    Magnetic driven pumps

    Other issues with magdrives : 1. They cannot be implemented for dirty fluids due to the hydrobearings using the pumped fluid as lubricant. 2. They shall not be used for variable duty points - the hydrobearings are designed for a certain flow at a certain pressure - any change and the life...
  16. pumpkind

    Hydraulics vs Mechanics on Wind Turbines

    It does not make any engineering sense for short distance transfer - if you refer to transfering a fluid via a pump run by the turbine to a hydraulic motor on the other end where to convert back into mechanical energy -> generator. Firstly, your system efficiency will not beat the efficiency of...
  17. pumpkind

    Metering pumps?

    If your main objective is dosing - peristaltic pumps are not better than metering pumps at that. If it is for transfer duty, then they might be considered. It is probably also a question on when you want to spend the money : Metering pumps have a large initial cost and relatively reduced life...
  18. pumpkind

    New GRAD - Impeller diameter

    I can answer what is the problem with impellers close to the maximum size allowed. Particularly when it comes to new applications or extended plant life - the Process Guys are asking for some spare capacity on their pumps - usually 10 % more head available if necessary. Two issues here ...
  19. pumpkind

    Vibration at pump recirculation minimum orifice outlet line

    The most probable cause is that the plate material is too thin and vibrates (if you are using a plate between flanges type -if not, please specify what kind of orifice ).
  20. pumpkind

    Practical way to get Impeller Diameter

    Most pumps sold for dedicated duites have their Impellers cutted to fit the duty. There are few ways to find out - I do not know how accurate you wanna be. 1. If the pump has a nameplate - the diameter of the fitted impeller is normally stamped on the nameplate. 2. Roughly speaking, you...

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