galvanized - copper replacement

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Old 08-17-02, 10:19 AM
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Question galvanized - copper replacement

looking to replace galvanzied supply lines with copper.

my intention is to use 3/4" for the main distribution pipes under the house and 1/2" for the branch pipes to fixtures..

i notice that the current supply lines are running something other than 3/4" and 1/2". i think it's 5/8" galavanized, but not sure?

the plan is replace the plumbing in stages as we work on renovating from room to room. Also, do not want to replace the main supply all the way to the street because it's underground.

therefore, i'm going to need a nipple that goes from 5/8" to 3/4" to run the 3/4" distribution under the house...

1) do they have those types of adapters? (galvanized nipple - 5/8" - 3/4" for 3/4" dielectric coupler)
2) do i need to worry about losing water pressure when i increase from 5/8" to 3/4" and then back down to 1/2" for branch pipes?

appreciate any comments or suggestions?
thanks
 
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Old 08-17-02, 10:27 AM
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Calculating pipe sizes.

fdonger:
If you go to the following site you can determine what exactly you're working with:

http://www.ajfittings.com/performance_charts.htm

This will tell you the size of pipe by measuring the outside diameter.
You can't use the inside diameter beacause it varies with the wall thickness.
 
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Old 08-17-02, 11:14 AM
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thanks Greg,
it looks like i'm running 1/2" galvanized throughout my house..i guess my mistake was comparing it to copper pipes...OD is definitely different
thanks again..

Frank
 
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Old 08-17-02, 01:04 PM
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fdonger:
Dielectric coupler installed as close to meter as possible, 3/4" to feed to 1/2" branches will give maximum pressure.
Ball valves will give 100% flow compared to regular globe valves.
They are worth the money.
 
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