C404.5 Efficient Heated Water Supply Piping
The maximum allowable piping length from the nearest source of heated water to the termination of the fixture supply pipe shall be in accordance with the following. Where the piping contains more than one size of pipe, the largest size of pipe within the piping shall be used for determining the maximum allowable length of the piping in Table C404.5.1.
- For a public lavatory faucet, use the "Public lavatory faucets" column in Table C404.5.1.
- For all other plumbing fixtures and plumbing appliances, use the "Other fixtures and appliances" column in Table C404.5.1.
PIPING VOLUME AND MAXIMUM PIPING LENGTHS
|NOMINAL PIPE SIZE|
(liquid ounces per foot length)
|MAXIMUM PIPING LENGTH|
|Public lavatory faucets||Other fixtures and appliances|
|2 or larger||18||0.5||4|
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 liquid ounce = 0.030 L, 1 gallon = 128 ounces.
The water volume in the piping shall be calculated in accordance with Section C404.5.2.1. Water heaters, circulating water systems and heat trace temperature maintenance systems shall be considered sources of heated water.
The volume from the nearest source of heated water to the termination of the fixture supply pipe shall be as follows:
- For a public lavatory faucet: not more than 2 ounces (0.06 L).