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  1. nabilbasha

    bypass decoupler pipe in primary/secondary chilled water system

    KiwiMace: I agree with your comment but I think it is a long run bypass hence pressure drop may be too much. The question then, can I get away without the bypass? If I have to use it what would be the maximum acceptable PD ?
  2. nabilbasha

    bypass decoupler pipe in primary/secondary chilled water system

    Sorry... I meant to load this photo instead of the other on previous post.http://files.engineering.com/getfile.aspx?folder=b93bd365-95be-44c7-82d9-510f8331094a&file=20130608_115721.jpg
  3. nabilbasha

    bypass decoupler pipe in primary/secondary chilled water system

    Thank you TYS90 and DRAZEN for your contribution and willing to support. The color lines I add it to make it easier to identify the flow diagram of supply and return. I have attached actual photo of the bypass from job site. DRAZEN: I am not quit sure the bypass on the top-lift corner is at...
  4. nabilbasha

    bypass decoupler pipe in primary/secondary chilled water system

    Hi everybody, In the attached typical primary / secondary chilled water system, you will notice that there are two (2) bypass pipes. This is the first time I come across such arrangement. i.e. 2 bypass. Also the location is wrong. In addition, having visited the job site, one of the bypass has...
  5. nabilbasha

    Parallel Pumps

    of course; as JJPellin explained; when using parallel pumping, the system piping size and head loss calculation must be based on the total flow of the system. e.g. if the total flow is 5000 and you decided to use 2 pumps, each rated for 2500. Then when two pumps operate will almost certainly...
  6. nabilbasha

    how to calculate loads for selecting vibration spring mounts on pump inertia base

    Kinetics Noise Control, Inc. and Mason Industries Inc. - a top manufacturers and pioneers in acoustical and vibrations specifically documents the fact that Pump bases shall be large enough to support suction and discharge elbows. These are also documented in other manufacturers specifications...
  7. nabilbasha

    how to calculate loads for selecting vibration spring mounts on pump inertia base

    Hi The base size, vibration spring mount, etc all comply with almost all vibration isolators manufacturers recommendations as well as ASHRAE standard. All pumps manufacturers as well as vibration isolators manufacturers suggest say that the inertia base must be extended to support the pipe...
  8. nabilbasha

    how to calculate loads for selecting vibration spring mounts on pump inertia base

    The pumps are new and being commissioned. I do not think the spring size is correct because I do not believe the contractor method of sizing is correct, hence I need to verify it and find a technical reference to it to support my claim to reject it. I fully agree with you, normally there should...
  9. nabilbasha

    Does increasing pipe size increase power requirements?

    I believe there is some confusion on part of danp129 question. All discussion above is 100% correct for a GIVEN pump in a system. However, if you are selecting a pump from scratch. Naturally, 200 GPM @ 60 FEET would have smaller motor hp than one selected for 200 GPM @ 150 FEET as same RPM...
  10. nabilbasha

    how to calculate loads for selecting vibration spring mounts on pump inertia base

    Sorry to trouble you buddy, and I appreciate your support. The info you gave me is good to design the inertia base and determine its weight, etc plus the Natural frequency so I could also decide the deflection rating of the spring isolator under the base. However, it does not address the total...
  11. nabilbasha

    how to calculate loads for selecting vibration spring mounts on pump inertia base

    I find this is great for pump foundation but what I am really looking for is regarding the spring vibration mounts size selection. What weights/loads that I should take into consideration when selecting the vibration mounts springs other than the weight of the pump/motor assembly plus the...
  12. nabilbasha

    how to calculate loads for selecting vibration spring mounts on pump inertia base

    Thanks desertfox but i can't see anything!!! did you attach a file or posted a link ??? where I can see steps 4,5,6 ???
  13. nabilbasha

    how to calculate loads for selecting vibration spring mounts on pump inertia base

    For the purpose of selecting the correct vibration spring isolator weight ratings on a 75hp end suction centrifugal water pump, someone told me I should it the sum of: concrete base + pump & motor assembly weight + valves & fittings weight up to first support/hanger + hydraulic weight. he...
  14. nabilbasha

    Pumps operating in end-of-curve

    I understand it is just an open system where the pump used just to lift up water to storage tank. Most likely the pump head was over calculated hence the pump operate to the right end of the curve. Simple solution is to fit globe valve and lose it slightly to move the operating point to the left...

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