pvc pipe size question

Hi there:

Sorry for intruding but can I ask a question. Can someone tell me please how much water roughly will travel through PVC 40 pipe by gravity (no pump), if it's vertical (roughly) and only about 6 ft high? In a few different diameters? I've looked on the internet and I can only find tables of friction loss and tables of maximum flow rates. I just want to get an idea for an aquarium system that I'm building. i.e. with 1/2", 1", 1.5", etc.

I appreciate any and all help. Quietreef

Reply to
quietreef
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"quietreef"

I don't think plumbers would know this. Try looking for "'alt.physics" or something.

Reply to
Mike Grooms

The formula for figuring volume of a cylinder is 2 pi r squared times height.

In the case of 1/2" inch pipe 72 inches high that would be (2 x

3.14 x .25squared) x 72. Which would give you 28 1/4 cubic inches. 1 gallon(US) is 231 cubic inches. So that would give you .1223 of a gallon, or about a pint.

That's how much water it will hold. How much water will travel through the pipe depends on whether it will be at full volume for the pipe and how long a period of time you are looking at. For a 6' length of pipe, friction loss is minimal for an aquarium.

Are you asking how long for a certain amount of water, or how much water in a certain amount of time?

Reply to
ebo walker

Hi there:

I'm looking for rate. If the water is falling by gravity with no pump or back pressure, roughly, how many gallons/hour will I get in a 1/2" pipe or a 1" pipe, which I assume is 2X whatever the 1/2 number is. Now that you've laid it out so nicely, I should be able to figure it out, thanks.

quietreef

Reply to
quietreef

ebo walker wrote in news: snipped-for-privacy@walker.com:

You mixed up the formula. It is pi r squared NOT 2 pi r squared. 2 pi r is for circumference.

You need a different formula to figure out the flow rate anyway (but you willuse this calculation also). You need the pressure of the water. In a vertical pipe you get 1 PSI of pressure for every 2.33 feet of head (height). You'd be at about 2.5 PSI at 6' (without a calculator). I am still looking for this formula, but if will give you cuft/sec. Then you can use 7.48 gal/cuft of water to calculate gal/sec.

Reply to
Eric G.

"Eric G."

Hey, by this time, he could have built the stupid thing, bought the pipe in several sizes, and timed it by himself.

Reply to
Mike Grooms

Yeah, I think I'll probably just do this. It's easy enough to time it myself, but thanks anyway.

Quietreef

Reply to
quietreef

"Mike Grooms" wrote in news:h58Yd.3300$ snipped-for-privacy@fe37.usenetserver.com:

I never said I was quick :-)

Reply to
Eric G.

I have held off on this post because it is soo stupid. Fill the god damn tub and time it darining dont build a thing. There are groups dedicated to fish tank systems.

Reply to
Ned Flanders

Be nice.....he may be making a home for Hots girl....Wanda !

Reply to
Red Jacket

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