Supply line sizing for RV and guest house

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secretcheese3000

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Hi all,

Long time listener, first time caller. :) We've got a property with an existing home served by a 1" supply line and we're building an RV pad and a guest house that will also be served by the existing meter.

First question: if the new supply line is teeing off the 1" line, does it even matter if the new line is larger? I.e., is the larger line restricted by its origin as a 1" line?

If the new line should be increased in size, how large should it be? The guest house is 300' from the meter. Existing house has laundry, water heater, two showers, three sinks. RV will have laundry and typical RV facilities. Guest house will have two sinks, one shower, water heater, laundry.

I've already trenched...now I need to throw something in it. :)

Many thanks!
Cheese
 

Reach4

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First question: if the new supply line is teeing off the 1" line, does it even matter if the new line is larger? I.e., is the larger line restricted by its origin as a 1" line?
Yes, no respectively. You will lose some pressure on the way to the tee, and you will lose some more pressure after the tee. Add them up.

If you have 30 PSI after drops at a house, that is usually pretty good.

Look up a pipe calculator to see the loss in each section.

http://irrigation.wsu.edu/Content/Calculators/General/Pipe-Velocity.php is one. If you can get 5 ft/sec, that is good. A little more would usually work too.http://www.engineeringtoolbox.com/hazen-williams-water-d_797.html is another calculator . There are others.
 

Dj2

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Go on balkanplumbing.com and read the useful info out there. You will learn how to calculate the pipe size.
 

secretcheese3000

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Look up a pipe calculator to see the loss in each section.

http://irrigation.wsu.edu/Content/Calculators/General/Pipe-Velocity.php is one. If you can get 5 ft/sec, that is good. A little more would usually work too.http://www.engineeringtoolbox.com/hazen-williams-water-d_797.html is another calculator . There are others.

Thank you! I'm stuck on hydraulic diameter. I read that for a circular tube the hydraulic diameter is simply the diameter of the tube--is this true?
 
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