The 3/4 Rule (Hot and cold water)
The 3/4 Rule (Hot and cold water)
(OP)
I am a junior plumbing designer in the Los Angeles area, can anyone explain the 3/4 rule meaning for example a sink is worth 2 fixture unites with the 3/4 rule it is 1.5 fixture units.
Thanks
Thanks





RE: The 3/4 Rule (Hot and cold water)
In the IPC, a sink has 2 drainage fixture units. The factor might have something to do with low flow fixtures, but doesn't have anything to do with code.
RE: The 3/4 Rule (Hot and cold water)
1. So it runs cold, then hot, then cold and stays cold? I take it you have a re-circulating line? If so and the lines are close to each other and uninsulated it's entirely possible to have the hot line heat the cold while the water is sitting. Their isn't anything you can really do about it besides insulate the pipes, get them further away from each other, or remove the re-circulating loop.
2. Did you replace any plumbing? It's possible you crossed a hot and cold line somewhere.
3. For some reason prior to you owning the house the hot and cold lines may have been tied together with a ball valve, perhaps an attempt at a home made mixing valve of sorts. Stuffing insulation may have knocked the handle on the valve open. [url=www.alsplumbing.com]Plummer[/url]
RE: The 3/4 Rule (Hot and cold water)
RE: The 3/4 Rule (Hot and cold water)
yeah, I finally get to use that book...
TTFN
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RE: The 3/4 Rule (Hot and cold water)
RE: The 3/4 Rule (Hot and cold water)