flow formula
- Thread starter beefller
- Start date
broomer5
Active Member
I may be able to help you.
What exactly are you trying to determine ?
sizing pumps or valves, head loss due to resistance of pipe or fittings, fps velocity, effects of viscosity, head pressure itself, pump curves, laminar or turbulence flow ???
There are formulas - what do you desire ?
If it's just flow rate of a given pipe diameter that you are interested in, you need to know the differential pressure or pressure drop, internal diameter (ID) of pipe,
the liquid that is flowing, it's density or specific gravity, and a couple other things.
Or a rough estimate if you have some details.
What exactly are you trying to determine ?
sizing pumps or valves, head loss due to resistance of pipe or fittings, fps velocity, effects of viscosity, head pressure itself, pump curves, laminar or turbulence flow ???
There are formulas - what do you desire ?
If it's just flow rate of a given pipe diameter that you are interested in, you need to know the differential pressure or pressure drop, internal diameter (ID) of pipe,
the liquid that is flowing, it's density or specific gravity, and a couple other things.
Or a rough estimate if you have some details.
broomer5
Active Member
IMO - You'd be wise to check out with the manufacturer of the overflows you plan to use.
They will tell you what the overflows are rated for ... but if you are just looking for an estimate.
1-1/2" 1400 to 1500 GPH
1-1/4" 900 to 1100 GPH
Are you planning to buy overflows or DIY ?
They will tell you what the overflows are rated for ... but if you are just looking for an estimate.
1-1/2" 1400 to 1500 GPH
1-1/4" 900 to 1100 GPH
Are you planning to buy overflows or DIY ?
broomer5
Active Member
Oh .. okay
If possible I would remove the 1-1/4" reducers and go 1-1/2" all the way. You will be able to use a larger return pump, and just a better approach IMO.
The amount of water that will actually "free-fall" down the overflow(s) is a function of the return pump(s) actual delivery rate, the ID of the overflow pipe, and gravity.
Rarely is the overflow constantly FULL of water, if so .... way oversized pump for the given overflow(s) and display tank water level will most likely run over the tank rim .... not good.
Let me work on this a bit and I'll get back to you.
Others here may have the rule of thumb, but presently I do not have it handy.
I can calculate it if you want an exact answer - or just give you the estimations most hobbyiest use.
Later .....
If possible I would remove the 1-1/4" reducers and go 1-1/2" all the way. You will be able to use a larger return pump, and just a better approach IMO.
The amount of water that will actually "free-fall" down the overflow(s) is a function of the return pump(s) actual delivery rate, the ID of the overflow pipe, and gravity.
Rarely is the overflow constantly FULL of water, if so .... way oversized pump for the given overflow(s) and display tank water level will most likely run over the tank rim .... not good.
Let me work on this a bit and I'll get back to you.
Others here may have the rule of thumb, but presently I do not have it handy.
I can calculate it if you want an exact answer - or just give you the estimations most hobbyiest use.
Later .....