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  1. rcooper

    Possible range of water flow discharge coefficient

    Are your downstream tappings far enough away from the orifice that the flow has fully expanded, rather than being a jet down the centre of the pipe. If it is far enough away, there will be some frictional losses. These could be measured by carrying out your tests without the orifice in place...
  2. rcooper

    Lift Station Floatation

    http://www.nmenv.state.nm.us/fod/LiquidWaste/septic.do.nots.html The above link shows some examples of concrete tanks floating.
  3. rcooper

    two pumps inseries

    What type of pumps are they?
  4. rcooper

    In service repair of aeration piping

    Depending on the size of the diffuser assembly, you could look at making a new free standing assembly with lifting equipment, connected to the blower via a flexible detachable hose so the whole assembly can be removed for future maintenance without draining the aeration lane.
  5. rcooper

    Strange Reynolds Number

    It is also worth highlighting 25362's comment and that the Reynold's number includes a characteristic length, but that length can be anything. With pipes it is often the diameter, for non-circular pipes and channels, it can be the hydraulic diameter or hydraulic radius. If you are looking at...
  6. rcooper

    With out these there would be pretty much nothing

    The GPS won't stop the navigation arguments in the car. Now, you will have the GPS telling you to turn left, but your wife is telling you to turn right. Do you a) Turn left and get to your destination, but suffer the wrath of your wife because you believed a silly computer rather than her...
  7. rcooper

    Going Paperless

    Back when I was a student, we had to pay 5p for every print out we did. It focused the mind on not making "Check prints" of reports and drawings, but making sure everything was right first time, or as near to that as possible. I learnt it is possible to do all your reading, editing, checking...
  8. rcooper

    Suction Vortex Suppression

    When I have been involved with scale models of pump intakes, we have scaled everything to maintain a Froude number identical to the full scale sump. This was to make the vortices act in a similar manner in the model as in the full scale sump. So I would guess, you would re-scale the designs...
  9. rcooper

    Venting of a Force Main Discharge Manhole

    I've seen drawings of a solution. I don't know how well it worked. The problem causing manhole is made air tight, including an air tight manhole cover. A second chamber is connected to the manhole and a pipe is laid from the base of the second chamber to the air void in the manhole. The pipe...
  10. rcooper

    Reduced flow when outlet valve of pump higher than 50% open

    My money is on a vortex at the pipe inlet, like what IFR said.
  11. rcooper

    Pipe suction pump arrangement from tank

    All the pumping station design guides I have read state a preference for one suction per pump where possible, ideally with each suction in a separate bay in the pumping station. (I don't have my references with me now). The single suction per pump eliminates multiple bends prior to the pump...
  12. rcooper

    Design of pressure line orifices for equal distribution

    Just a small note on what katmar is saying, as the flow moves down the pipe, friction will be causing the pressure to reduce as he describes, but the conversion of velocity head to pressure will be making the pressure increase. If the distribution pipe is short, then the pressure at the dead...
  13. rcooper

    Design of pressure line orifices for equal distribution

    http://water-works.wikidot.com/flow-distribution Something I was working on a while ago and haven't finished, but it will give you an idea on how to size these.
  14. rcooper

    Document Control

    From the client's perspective, they are not necessarily the experts, that is why they are employing you. They may not know what you need and therefore haven't commissioned the tests which you require. As for record drawings, things happen within the client organisation which might make it...
  15. rcooper

    Combined Water/Air Backwash of RGF

    Is the clean backwash water storage tank at a similar level or higher than filters? If so finding a pump will be a real challenge. The water only rate seems about right. The combined air/water rates seem low, but they depend upon the media being used. It does vary with temperature...
  16. rcooper

    Combined Water/Air Backwash of RGF

    Has your mechanical engineer considered using two pumps for the higher flow rates and one pump for the lower flow rates?
  17. rcooper

    Where can I get old engineering drawings?

    http://books.google.co.uk/books?id=sSUDAAAAQAAJ&pg=RA2-PA187&dq=intitle:the+intitle:practical+intitle:draughtsman&lr=&as_brr=0#PPP1,M1 Try this googlebook and doing other searches on googlebook
  18. rcooper

    Flow Turbulence - Pipe Fittings

    I think this is a language issue. Flow is turbulent or laminar, or somewhere between the two. Flow stops being laminar when the kinematic forces are sufficient to make the laminar flow unstable. Flow can be uniform or non-uniform. With uniform flow, the velocity (speed and direction) is the...
  19. rcooper

    control valve sizing for extremely low flows

    An alternative approach might be to use a small positive displacement pump fitted to a variable speed motor, such as a peristaltic pump or diaphragm pump to allow you to control the low flows.
  20. rcooper

    Changing Pitch Noise at inlet

    Only if you can get the right grade of chickens.

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