The maximum number of water closet flush valves allowed
to be supplied from a single source shall conform to the schedule of pipe sizes and water pressures listed in Table P811.3.
Note a: Numbers shown in parentheses designate maximum allowed distance of fixtures from pneumatic tank or underground main.
Note b: See Section P-811.3.2
| First Floor Above Groundb | |||||||
|---|---|---|---|---|---|---|---|
| Pneumatic Tank or Underground Main Pressure Using Iron Pipe |
Ferrule Size | ||||||
| 1" | 1-1/2" | 2" | 3" | 4" | 6" | 8" | |
| 30 psi | 1 (200') | 2 | 12 | 50 | 180 | 450 | |
| 40 psi | 1 (25') | 1 (400') | 4 | 24 | 80 | 220 | 450 |
| 50 psi | 1 (50') | 1 | 7 | 40 | 110 | 220 | 450 |
| 60 psi | 1 (75') | 2 | 7 | 40 | 110 | 220 | 450 |
| 70 psi | 1 (100') | 3 | 7 | 40 | 110 | 220 | 450 |
| First Floor Above Groundb | |||||||
| Pneumatic Tank or Underground Main Pressure Using Copper Tubing |
Ferrule Size | ||||||
| 1" | 1-1/2" | 2" | 3" | 4" | 6" | 8" | |
| 30 psi | 1 (250') | 3 | 15 | 55 | 200 | 450 | |
| 40 psi | 1 (30') | 1 (500') | 6 | 30 | 110 | 220 | 450 |
| 50 psi | 1 (65') | 2 | 9 | 40 | 110 | 220 | 450 |
| 60 psi | 1 (100') | 3 | 9 | 40 | 110 | 220 | 450 |
| 70 psi | 1 (135') | 4 | 9 | 40 | 110 | 220 | 450 |
Note a: Numbers shown in parentheses designate maximum allowed distance of fixtures from pneumatic tank or underground main.
Note b: See Section P-811.3.2
For each floor above the first floor, deduct 10 psi from the tank or main pressure.
Two urinals shall be counted as one water closet.