Re: Plumbing code question.
Posted by hj on November 22, 2002 at 22:26:30:
In response to Re: Plumbing code question.
If he is using the numbers directly then he is making a mistake. There is also a "load factor" that is applied to those numbers to compensate for the fact that the fixtures will never all be operating at the same time. Depending on the type of structure, that load factor could be as low as 20% of the total fixture calculation.

: : Is the regulatory body specifying the 50 gpm or a chart? In the real world you have to consider the usage. One person or a small family in that large house will not need the water supply that a large family, or families, would living in that same house. At the modern usage, you would have to be taking 15 or 20 showers simultaneously to use 50 gpm.

: : : With residential potable water to a very large house and using the fixture unit method to establish the flow rate, say we find 50 gpm. The building is supplied by well water and the 50 gpm can�t be met by two wells but they can supply say 40 gpm.

: : : My question: Is there a time limit that the 50 gpm must be supplied for, such as ten minutes which I�ve been told I have to provide, per �code�. I haven�t heard what code as yet. Anyone know what the code actually says?

: Thanks HJ. Now I�m told by the original poster, �Doing a fixture count, converting to fixture units then to gpm using the Wisconsin Plumbing Code, it calls for a flow of 50 gpm.�. He is not the one that said code says 10 minutes. So can you help me with the 100 gal. retention tank part and it�s supposed ability to provide an �extra� 10 gpm for 10 minutes?

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