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OT engineers
Posted on 7/21/15 at 9:51 am
Posted on 7/21/15 at 9:51 am
I have a problem solving how many GPM is being added to a tank and all I know is the pressure, how much the valve is open, and the diameter of the pipe it is flowing through. Any other information I need and how should I work this out?
This post was edited on 7/21/15 at 9:52 am
4
Posted on 7/21/15 at 9:51 am to tigerclaw10
How fast is it going?
Posted on 7/21/15 at 9:53 am to tigerclaw10
Cv of the valve
Posted on 7/21/15 at 10:00 am to MNCscripper
Need more info. If the tank isn't vented and the tank pressure increases with time, the rate of increase in liquid volume will be proportional to the rate of increase in tank pressure as the gas above the liquid is compressed.
Posted on 7/21/15 at 10:03 am to MNCscripper
quote:
Cv of the valve
That to start, also the length of the pipe, any fittings like elbows or tees, any elevation change to the tank. Viscosity of the fluid, roughness of pipe.
Posted on 7/21/15 at 10:21 am to Tigris
if you can measure the air flow (in CFM) from a single vent, you can get a pretty good estimate of GPM - multiply CFM by 7.48 to get GPM
can use a handheld pitot tube or anemometer
or measure liquid height over time - can get a pretty accurate radar liquid level gauge to fit on top the tank
can use a handheld pitot tube or anemometer
or measure liquid height over time - can get a pretty accurate radar liquid level gauge to fit on top the tank
Posted on 7/21/15 at 10:24 am to tigerclaw10
Let me try this.
You need the Q, or flow rate, in GPM.
You can get Q from Q = V x A.
You know A if you know the diameter of the pipe: A = pi x R^2.
You need to find the velocity, V. Use the dynamic pressure equation if you already know the pressure, P, to find the velocity: P = 0.5p(V^2), where p = density of your fluid. Solve for V.
Make sure your units get you into CFS for the flow rate equation, then convert that to GPM.
I hope that works...it's been a while since I've done fluid dynamics.
You need the Q, or flow rate, in GPM.
You can get Q from Q = V x A.
You know A if you know the diameter of the pipe: A = pi x R^2.
You need to find the velocity, V. Use the dynamic pressure equation if you already know the pressure, P, to find the velocity: P = 0.5p(V^2), where p = density of your fluid. Solve for V.
Make sure your units get you into CFS for the flow rate equation, then convert that to GPM.
I hope that works...it's been a while since I've done fluid dynamics.
This post was edited on 7/21/15 at 10:29 am
Posted on 7/21/15 at 10:29 am to tigerclaw10
quote:
Any other information I need
Bernoulli's equation...
Posted on 7/21/15 at 7:26 pm to Buck_Rogers
yup Benoullis
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