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Monkey math?? water flow

A

Anonymous-0

Well-known Member
Hey folks,
I get about 4 gallons a minute out of outside faucets around the barn (+/- a qt or 2 depending on which one).
All are fed by one main water line (1"). Figured my problem was half inch line but didn't think it was necessary to upgrade.
Now, doing some work yesterday, I uncovered a hole in a floow where that main connects to house water. They have adapters and are connected with a flexible supply line like you find under the bathroom sink (1/4" ID??). To keep it simple and use the biggest flex line I cat fit will give it a 3/4"ID).

How much do you think the water flow would increase? Surely enough to make it worthwhile to have at least the faucet I use to fill my water tanks fed by an inch or 3/4" line??

Dave
 
(quoted from post at 04:52:55 06/02/10) Hey folks,
I get about 4 gallons a minute out of outside faucets around the barn (+/- a qt or 2 depending on which one).
All are fed by one main water line (1"). Figured my problem was half inch line but didn't think it was necessary to upgrade.
Now, doing some work yesterday, I uncovered a hole in a floow where that main connects to house water. They have adapters and are connected with a flexible supply line like you find under the bathroom sink (1/4" ID??). To keep it simple and use the biggest flex line I cat fit will give it a 3/4"ID).

How much do you think the water flow would increase? Surely enough to make it worthwhile to have at least the faucet I use to fill my water tanks fed by an inch or 3/4" line??

Dave
Click to expand...
ou can expect more than double, but there are other factors, such as length of 1/4 line, length of 3/4 line, pressure, and other factors, so knowing as little as you describe, I go with 'more than double' as conservative estimate.
 
It depends on a number of things, including what your main is capable of supplying, the water pressure in the main, how long the various lines are in your system, how big they are and how long this 1/4 inch ID hose is. If it turns out that the 1/4 inch segment is the single greatest restriction in your system, it could be huge. Increasing the ID from 1/4 inch to 3/4 inch will increase the cross-sectional area by nine times, meaning potentially nine times as much flow!

Probably the restriction caused by the short 1/4 inch ID segment is relatively small compared to the pressure drop in the rest of the system. But I would certain try to replace it with something bigger. And for any long lines, such as those going to your tanks, one inch pipe is the minimum you should use. A 3/4 inch pipe has 2.25 times the cross-sectional area of a 1/2 inch pipe, and a one inch pipe has four times the area.
 
we'll print that and run with it.......

That 1/4" line is about a foot long. The other, I'll run right off an inch line to a frostfree faucet I've had laying around for about 6 years trying to find a rountuit that fit it.............. I'm happy with anything over what I have. City water so pressure is good and constant.

Thanks, Dave
 
(quoted from post at 02:42:26 06/02/10) And for any long lines, such as those going to your tanks, .
Click to expand...
Fill the tanks (portable) with a 3/4" water hose and feed automatic water bowls with 3/4". Just that one water faucet was a quick thought for convenience and I plumbed it with 1/2" because it's what I had at the house. Accidently found that 1/4" piece when I was taking up tiles on a floor to replace. Something sounded funny and I started hammering around and found a whole that had been tiled over.

Dave
 
Basic fire department rule of thumb, is add 10# of pressure for every fifty ft of hose. A 2 1/2 inch hose will put out almost five times the water of a 1 1/2 hose.
 
Get that 1/4" line out you can only get the amount
of water that will flow through a 1/4" hole out of
the pipe don't care how long it is. I once was sent
to see why a chlornator wasn't working. They had
three on a 2" line, Each one takes at least a 3/4"
line. started checking the source they were feeding
the 2" line with a 3/4" tap. I recomemend that they
re-tap with a 2" .
 
Ignoring internal fluid friction, if you double the diameter of a pipe, you quadruple the cross sectional area and therefore the amount of liquid that will flow past that point at a given pressure.
 
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