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How to calculate meter to sqmeter?

How would one 'calculate' (or even estimate) volumetric flow with neither a flow meter nor pressure gauge?

  • I'm a certified pool operator and i just started on this really ancient pool. It was built as an FDR work incentive program with donated material (you can literally see where they ran out of bricks building the pool house and used another color/style). Regardless, I need to know the flow rate (GPM) of my main drain pump for some essential calculations. I can, and of course will install a flow meter to be par with code and for daily need. But i don't want to install something to weak that will max out, nor something overly expensive. So i need an idea before hand (ironic i know, they ask you your flow rate as you're buying a flow meter; like someone asking your temp. before handing you a thermometer.) Typically flow rate is printed/stamped on the turbine, but the plate has rusted away. How can i calculate, or even guess the flow rate with only limited information (HP of pump, diameter of impeller, etc.) or if you can think of a nifty trick that will get me close enough. Thanks

  • Answer:

    If it is working, why not fill a container and time the filling? A "container" could be a hole in the ground where you can do rough measurements (2x2x10 feet is 40 cubic feet, roughly 320 gallons.) or a kids pool or a trench (1x1x40 feet) Or put water in the pool, drop the level one inch with the pump and figure the volume moved.

willem stockton at Yahoo! Answers Visit the source

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you could drain it completely, pour ten or so gallons in, and time how long it took to pass through. But then, the flow rate will of course be much faster when it has several thousand gallons sitting on top of it... So if you could figure out the surface area of the waterline at full, then let it drain down a few inches and time it, you could probably get a rough estimate. and if that plate is rusted but still intact, you OsPho it. If you can't get OsPho, some muriatic acid will do the same thing- convert any rust back to iron to make it readable again. The HCl will produce FeCl2 though, which is not exactly safe.

Austin F

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