Formula or someone smarter than me

[millstreaminn]

We had a heating system freeze and break last winter. I am looking for (or someone can probably calculate it easily) how many GPM a 3/4 copper line will flow unrestricted with 80 PSI? I looked for a calculator online, but no joy... Thanks-

 

[JW IN VA]

Wish I could help.Maybe someone with HVAC

 

[Nesikep]

the system pressure is irrelevant, what matters is your acceptable pressure drop between two points..

Here's a link that might help you
http://www.constructionknowledge.net/pu ... design.pdf

 

[millstreaminn]

Got it, thanks Nesi- We dumped 204,000 gallons of water into the basement of that house when the heating system broke. We were wondering how long it had been broken for.

According to the link, 3/4 copper with 80 PSI can pump 36 GPM. Thus 204,000 could have came out of the heating system in about 4 days.