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Max flow rate through pipe 1
- Thread starter kcons5055
- Start date
I don't know if this is a "wind up" or not, but I'll answer it anyway.
There is no (practical) "maximum flow rate of fuel through a 7 inch pipe". As BobPE says in his last post, "I figure if I put this one pump on that pipe that I saw in a book, I could get 1,000,000 gpm through it.....".
I'm sure that if I look through my catalogues for a few minutes, I can find a pump that will shift two-times, three-times, ten-times...etc that much!!!
On the other hand, if you have a limiting factor within which you want to stay (say an average pipe velocity of 1.5 metres per second), then the maximum flow rate would be:
Pipe Internal Diameter 7 inches (say 0.175 metres)
Pipe Area about 0.025 metres squared (pi x (dia^2)/4)
Pipe Velocity 1.5 metres per second
Pipe Flowrate 0.025 metres squared X 1.5 metres per second = 0.0375 metres cubed per second (34.5 litres per second)
Sorry about the metric units!!!
Regards,
Brian
There is no (practical) "maximum flow rate of fuel through a 7 inch pipe". As BobPE says in his last post, "I figure if I put this one pump on that pipe that I saw in a book, I could get 1,000,000 gpm through it.....".
I'm sure that if I look through my catalogues for a few minutes, I can find a pump that will shift two-times, three-times, ten-times...etc that much!!!
On the other hand, if you have a limiting factor within which you want to stay (say an average pipe velocity of 1.5 metres per second), then the maximum flow rate would be:
Pipe Internal Diameter 7 inches (say 0.175 metres)
Pipe Area about 0.025 metres squared (pi x (dia^2)/4)
Pipe Velocity 1.5 metres per second
Pipe Flowrate 0.025 metres squared X 1.5 metres per second = 0.0375 metres cubed per second (34.5 litres per second)
Sorry about the metric units!!!
Regards,
Brian
kcons5055
There is no single answer for your question based on the info you gave. If I assume you are pumping with metal pipe and want to know the friction losses you should use the Hazen Williams formula:
F= 2.083(100/C)^1.85 (Q)^1.85/ID^4.8655
Where:
F= Feet loss per 100 feet
Q= Flow in GPM
C=120
Once you calculate the friction loss you can look on your pump curve and see what flow to expect.
If you have an existing pipe and want to know Qmax in order to buy a pump several things to consider are:
The friction loss cost or opX. If you are talking about 5 feet or 5000 feet will change any answer given. Your need for pumping the fluid verses the associated friction loss is something that you need to determine.
Fluid velocity will cause erosion wear or failure. Not knowing the "FUEL" you want to pump makes any answer questionable. If you are pumping a somewhat corrosive liquid you would want the velocity low to avoid combining both corrosive and erosion problems in your line.
The expected length of service for the operation needs to be considered to make pump / tubing decisions. If you are only going to pump for one day you may want to consider Bob’s million GPM pump. It may survive.
Being fuel I doubt that you have any solids. If you are pumping solids such as sand, rocks etc. you will want the velocity high so the solids won’t “fall-out” in your tubing. Any discussion that I have heard about recommended fluid velocity seems to be qualified by what is being pumped.
The numbers that I have heard in the petroleum industry range from 2 FPS to 15 FPS, but those numbers can change dramatically based on any variables that you may add.
David
There is no single answer for your question based on the info you gave. If I assume you are pumping with metal pipe and want to know the friction losses you should use the Hazen Williams formula:
F= 2.083(100/C)^1.85 (Q)^1.85/ID^4.8655
Where:
F= Feet loss per 100 feet
Q= Flow in GPM
C=120
Once you calculate the friction loss you can look on your pump curve and see what flow to expect.
If you have an existing pipe and want to know Qmax in order to buy a pump several things to consider are:
The friction loss cost or opX. If you are talking about 5 feet or 5000 feet will change any answer given. Your need for pumping the fluid verses the associated friction loss is something that you need to determine.
Fluid velocity will cause erosion wear or failure. Not knowing the "FUEL" you want to pump makes any answer questionable. If you are pumping a somewhat corrosive liquid you would want the velocity low to avoid combining both corrosive and erosion problems in your line.
The expected length of service for the operation needs to be considered to make pump / tubing decisions. If you are only going to pump for one day you may want to consider Bob’s million GPM pump. It may survive.
Being fuel I doubt that you have any solids. If you are pumping solids such as sand, rocks etc. you will want the velocity high so the solids won’t “fall-out” in your tubing. Any discussion that I have heard about recommended fluid velocity seems to be qualified by what is being pumped.
The numbers that I have heard in the petroleum industry range from 2 FPS to 15 FPS, but those numbers can change dramatically based on any variables that you may add.
David
Maybe if the original poster would supply some more information what they are looking for (hint, hint), we could provide them with some more applicable information. Not slamming anyone here for what they have said, this is a matter of not knowing what the OP really is looking for.
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