Or...How many feet per gallon? haha!

I'm trying to calculate how long the pipe lines are in a floor slab.

The piping is the old gray 3/4" pre-PEX pipes.

I ran about 12-1/2 gallons of water through it to have water come out the other end.

If my math is right, 3/4" pipe holds about a gallon for every 43.33 feet of 3/4" pipe?

So, with 12 gallons going through it, the pipe is about 500" right?

Give or take about 20 feet allowing for the air that probably ran on top of the water inside the pipe as I ran the water through horizontal-laying pipes in a concrete slab?

I'm trying to calculate how long the pipe lines are in a floor slab.

The piping is the old gray 3/4" pre-PEX pipes.

I ran about 12-1/2 gallons of water through it to have water come out the other end.

If my math is right, 3/4" pipe holds about a gallon for every 43.33 feet of 3/4" pipe?

So, with 12 gallons going through it, the pipe is about 500" right?

Give or take about 20 feet allowing for the air that probably ran on top of the water inside the pipe as I ran the water through horizontal-laying pipes in a concrete slab?

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