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// CODE SNIPPET

P-811.3 Minimum Water Supply Sizes to Flushometers

Philadelphia Plumbing Code > 8 Water Supply and Distribution > P-811 Water Supply Fixtures > P-811.3 Minimum Water Supply Sizes to Flushometers
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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.

TABLE P-811.3 —
MINIMUM WATER SUPPLY SIZES TO FLUSHOMETERSa
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

P-811.3.1 Length Adjustment

If the distance from the fixture to the pneumatic tank or underground main is in excess of 500 feet, deduct 10 psi from the tank or main pressure.

P-811.3.2 Height Adjustment

For each floor above the first floor, deduct 10 psi from the tank or main pressure.

P-811.3.3 Urinals

Two urinals shall be counted as one water closet.

Related Code Sections


P-811.3 Water Supply and Distribution, Minimum Water Supply Sizes to Flushometers
pressures listed in Table P811.3. TABLE P-811.3 — MINIMUM WATER SUPPLY SIZES TO FLUSHOMETERS a First Floor Above Ground b ...
Philadelphia Plumbing Code > 8 Water Supply and Distribution > P-811 Water Supply Fixtures > P-811.3 Minimum Water Supply Sizes to Flushometers
P-811.4 Water Supply and Distribution, Existing Installations
On existing installations, the water supply connected to flushometers shall be permitted without increasing the size of the ferrule, provided a tank ...
Philadelphia Plumbing Code > 8 Water Supply and Distribution > P-811 Water Supply Fixtures > P-811.4 Existing Installations
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