610.10 Sizing for Flushometer Valves.

Where using Table 610.4 to size water supply systems serving flushometer valves, the number of flushometer fixture units assigned to every section of pipe, whether branch or main, shall be determined by the number and category of flushometer valves served by that section of pipe, in accordance with Table 610.10. Piping supplying a flushometer valve shall be not less in size than the valve inlet.

WATER SUPPLY AND DISTRIBUTION

Where using Table 610.10 to size water piping, care shall be exercised to assign flushometer fixture units based on the number and category of fixtures served.

In the example below, fixture units assigned to each section of pipe are computed. Each capital letter refers to the section of pipe above it unless otherwise shown.

LAV LAV UR UR WC WC

A: 1 WC = 40 F.U. B: 2 WC = 70 F.U. C: 2 WC (70) + 1 UR (20) = 90 F.U. D: 2 WC (70) + 2 UR (35) = 105 F.U. E: 2 WC (70) + 2 UR (35) + 1 LAV (1) = 106 F.U. F: 2 WC (70) + 2 UR (35) + 2 LAV (2) = 107 F.U. G: 1 LAV = 1 F.U. H: 2 LAV = 2 F.U. I: 2 LAV (2) + 1 UR (20) = 22 F.U. J: 2 LAV (2)+ 2 UR (35) = 37 F.U. K: 2 LAV (2) + 2 UR (35) + 1 WC (40) = 77 F.U. L: 2 LAV (2) + 2 UR (35) + 2 WC (70) = 107 F.U. M: 4 WC (105) + 4 UR (53) + 4 LAV (4) = 162 F.U. N: 1 WC = 40 F.U. O: 1 WC (40) + 1 UR (20) = 60 F.U. P: 1 WC (40) + 1 UR (20) + 1 LAV (1) = 61 F.U. Q: 2 WC (70) + 1 UR (20) + 1 LAV (1) = 91 F.U. R: 2 WC (70) + 2 UR (35) + 1 LAV (1) = 106 F.U. S: 2 WC (70) + 2 UR (35) + 2 LAV (2) = 107 F.U. T: 6 WC (125) + 6 UR (63) + 6 LAV (6) = 194 F.U.

EXAMPLE 610.10

SIZING METHOD FOR PUBLIC USE FIXTURES

USING TABLE 610.10

2022 CALIFORNIA PLUMBING CODE 159

WATER SUPPLY AND DISTRIBUTION