Pipe size needed to softener

[Bob from accounting]

I will be re-pluming my garage to make room for a water softener. The softener says it has a 1" input.
I will need to T into the main water line. Should I keep it 1" from the main line all the way to the input of the softener.
Or, do people run 3/4" and then connect to a 1" input valve?
We get about 55-60PSI.
The existing configuration looks like it T's into the main line with a 1" line. But than 4' down the line looks like a compression fitting that goes into 3/4" and that feeds the hot water heater. Breaks out into 1/2" copper lines to the kitchen out of the hot water heater.
How long do I stay 1" and why are their pipes branching out that are 1/2"?
They are all L type copper pipes.

 

[Reach4]

You want to bring 1 inch into the softener and out. You can usually drop to 3/4 after the water tees off to the WH.

1/2 inch copper is good to supply a bathroom or kitchen normally I think, although you can run 3/4 for the cold to a bathroom. For PEX, you probably want 3/4 for the cold to the bathroom. To supply two bathrooms with a pipe may need a larger pipe.

Tee off after the main valve, and before the softener, for irrigation water.

 

[Sponsor]

 

[ditttohead]

Do not reduce the pipe size. Code states you can not reduce the pipe before the softener...

 

[Bob from accounting]

I read a Home Depot review that this individual bought 1" L type copper pipe for his project. He said the fittings would not fit as the pipe was actaully OD is 1.125"?
Is this something I need to be concerned about with buying 1" L type copper pipes and 1" fittings? I have never seen or heard this in online discussions?

 

[LLigetfa]

When I had my new iron filter and softener installed, we used 1 inch copper adapters. They had a quality control issue where only 1 of them would fit. We had to take them to a machinist to turn them down.

Just make sure they fit before you take down the existing system.

 

[Reach4]

I read a Home Depot review that this individual bought 1" L type copper pipe for his project. He said the fittings would not fit as the pipe was actaully OD is 1.125"?
Is this something I need to be concerned about with buying 1" L type copper pipes and 1" fittings? I have never seen or heard this in online discussions?

1 inch copper is 1.125 OD. That is true for types K, L, and M.

1 inch copper fittings are made to fit 1.125 OD round pipe. If they do not, the fitting is defective or the pipe is defective -- such as bent out of round.

 

[LLigetfa]

I doubt the issue was with standard copper pipe and fittings but rather the special adapter that mates to the head.

 

[LLigetfa]

I doubt the issue was with standard copper pipe and fittings but rather the special adapter that mates to the head.

For example, in my case it was item #4, Brass Sweat Assembly that we needed to turn on a lathe.