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How many gallons in a 3/4" x 50' pipe"
Posted by: Dennis S
Date: February 13, 2007 02:03PM
I quit using a water heater at the end of the house with the washer and kitchen. I'm saving a lot of electricity, but I wonder how much water I use waiting for hot water from 50 feet away from the other water heater.
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Re: How many gallons in a 3/4" x 50' pipe"
Posted by: MacMagus
Date: February 13, 2007 02:07PM
Is there air in that pipe?

Or are you wasting the cool water down the drain before you do the dishes?
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Re: How many gallons in a 3/4" x 50' pipe"
Posted by: raz
Date: February 13, 2007 02:09PM
I make it 1.146 gallons

volume of pipe is pi r^2 h = pi * 3/8 ^ 2 * 50 * 12 = 264 in^3 = 0.15333 ft^3 = 1.164 gallons

(all done in Dashboard)



--------------

Embarassing myself on the Internet since 1978.



Edited 1 time(s). Last edit at 02/13/2007 02:10PM by raz.
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Re: How many gallons in a 3/4" x 50' pipe"
Posted by: papercup
Date: February 13, 2007 02:10PM
Dishwashers perform lousy when supplied w/only cold water. Washing machines too. Detergents need warm water.

What did you do?
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Re: How many gallons in a 3/4" x 50' pipe"
Posted by: lafinfil
Date: February 13, 2007 02:13PM
Hot water recirculation - [www.taco-hvac.com]



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Re: How many gallons in a 3/4" x 50' pipe"
Posted by: earache
Date: February 13, 2007 02:15PM
Autocirc - [www.autocirc.com]



earache
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Re: How many gallons in a 3/4" x 50' pipe"
Posted by: papercup
Date: February 13, 2007 02:16PM
Quote
lafinfil
Hot water recirculation - [www.taco-hvac.com]

I have that, and it's fantastic. Inefficient & expensive to run, but fantastic.

I have very long runs & luckily the original builder had the foresight to double-plumb the entire house.


Never wait more than a half second for hot water.

I did, however, insulate all the exposed copper I could to minimize heat loss.
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Re: How many gallons in a 3/4" x 50' pipe"
Posted by: billb
Date: February 13, 2007 02:20PM
I've got 30 feet of half inch and it takes a bout a gallon to get really hot after mixing.
It helped to insulate it, except that first time in the A.M.. My cellar is fairly warm, as cellars go.
I cheated and filled a container under the tap to calculate. :-)
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Re: How many gallons in a 3/4" x 50' pipe"
Posted by: Lux Interior
Date: February 13, 2007 02:26PM
Quote
raz
I make it 1.146 gallons

I get 1.147 Gal.
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Re: How many gallons in a 3/4" x 50' pipe"
Date: February 13, 2007 02:52PM
I did it in Google

[www.google.com]

1.14749731 US gallons
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Re: How many gallons in a 3/4" x 50' pipe"
Posted by: jimbrady
Date: February 13, 2007 03:05PM
3/4" is the diameter to the outside of the pipe, no? Seems like pretty exact math for an inexact question.



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Re: How many gallons in a 3/4" x 50' pipe"
Posted by: Dennis S
Date: February 13, 2007 03:19PM
Quote
papercup
Dishwashers perform lousy when supplied w/only cold water. Washing machines too. Detergents need warm water.

What did you do?

They get hot water after if gets there from the other water heater.



Edited 1 time(s). Last edit at 02/13/2007 03:39PM by Dennis S.
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Re: How many gallons in a 3/4" x 50' pipe"
Posted by: billb
Date: February 13, 2007 03:33PM
Quote
jimbrady
3/4" is the diameter to the outside of the pipe, no? Seems like pretty exact math for an inexact question.

Type L 3/4 inch pipe should have a 3/4" ID and an 0.875 OD. (generally add 1/8 inch wall thickness to nominal inch size.

IIRC.
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Re: How many gallons in a 3/4" x 50' pipe"
Posted by: Harbourmaster
Date: February 13, 2007 05:20PM
Any good racer knows that flexible hose is measured by Inside Diamater = I.D.
Rigid Tubing (pipe) is measured by Outside Diameter = O.D.



Aloha, Ken


“I have developed significant attachments to several members even though I wouldn't recognize them if I sat next to one on a park bench. I'm often tempted when in an airport to walk around, hollering "The Løpe", to see if anyone other than the Homeland Security people will acknowledge me. ” - The Løpe
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Re: How many gallons in a 3/4" x 50' pipe"
Posted by: billb
Date: February 13, 2007 06:02PM
Quote
Harbourmaster
Any good racer knows that flexible hose is measured by Inside Diamater = I.D.
Rigid Tubing (pipe) is measured by Outside Diameter = O.D.

. The nominal dimension for pipe is the ID. So, 1½-inch pipe is NOT 1½-inch outside diameter, but instead is nominally, (approximately) 1½-inch inside diameter.

Tubing = gauge.
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Re: How many gallons in a 3/4" x 50' pipe"
Posted by: sscutchen
Date: February 13, 2007 07:08PM
Depends on the pipe schedule. Schedule 40 is a typical 150# class pipe.

ID for 3/4" schedule 40 pipe is 0.742". 1.12 gal.

Schedule 40 3/4" is not strong enough to support the weight of a person over a long span. Some sometimes code requires schedule 80; the ID is 0.710". 50' = 1.03 gal.





Don't ask who the bell's for, dude. It's you.
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Re: How many gallons in a 3/4" x 50' pipe"
Posted by: Harbourmaster
Date: February 13, 2007 07:09PM
OK so plumbing pipe is different than steel tubing commonly used for building stuff !
I'm used to dealing with Hydraulic Hoses and hard lines
.
Found this nice chart for common plumbing sizes:




Aloha, Ken


“I have developed significant attachments to several members even though I wouldn't recognize them if I sat next to one on a park bench. I'm often tempted when in an airport to walk around, hollering "The Løpe", to see if anyone other than the Homeland Security people will acknowledge me. ” - The Løpe
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Re: How many gallons in a 3/4" x 50' pipe"
Posted by: sscutchen
Date: February 13, 2007 07:27PM
Nominal pipe size:

[en.wikipedia.org]





Don't ask who the bell's for, dude. It's you.
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Re: How many gallons in a 3/4" x 50' pipe"
Posted by: billb
Date: February 14, 2007 08:18AM
Problem with tubing is everyone calls it pipe. :-)

( which is also why I use a bucket to calculate the volume(s) and flow(s).



Edited 1 time(s). Last edit at 02/14/2007 08:20AM by billb.
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