CODE SNIPPET
Section P3113 Vent Pipe Sizing
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P3113.1 Size of Vents
The required diameter of individual vents, branch vents, circuit vents, vent stacks and stack vents shall be not less than one-half the required diameter of the drain served. The required size of the drain shall be determined in accordance with Chapter 30. Vent pipes shall be not less than 11/4 inches (32 mm) in diameter. Vents exceeding 40 feet (12 192 mm) in developed length shall be increased by one nominal pipe size for the entire developed length of the vent pipe.
P3113.2 Developed Length
The developed length of individual, branch and circuit vents shall be measured from the farthest point of vent connection to the drainage system, to the point of connection to the vent stack, stack vent or termination outside of the building.
P3113.3 Branch Vents
P3113.4 Sump Vents
P3113.4.1 Sewage Pumps and Sewage Ejectors Other Than Pneumatic
Drainage piping below sewer level shall be vented in the same manner as that of a gravity system. Building sump vent sizes for sumps with sewage pumps or sewage ejectors, other than pneumatic, shall be determined in accordance with Table P3113.4.1.
| DISCHARGE CAPACITY OF PUMP (gpm) | MAXIMUM DEVELOPED LENGTH OF VENT (feet)a | ||||
| Diameter of vent (inches) | |||||
| 11/4 | 11/2 | 2 | 21/2 | 3 | |
| 10 | No limitb | No limit | No limit | No limit | No limit |
| 20 | 270 | No limit | No limit | No limit | No limit |
| 40 | 72 | 160 | No limit | No limit | No limit |
| 60 | 31 | 75 | 270 | No limit | No limit |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon per minute (gpm) = 3.785 L/m.
- Developed length plus an appropriate allowance for entrance losses and friction caused by fittings, changes in direction and diameter. Suggested allowances shall be obtained from NBS Monograph 31 or other approved sources. An allowance of 50 percent of the developed length shall be assumed if a more precise value is not available.
- Actual values greater than 500 feet.
P3113.4.2 Pneumatic Sewage Ejectors
The air pressure relief pipe from a pneumatic sewage ejector shall be connected to an independent vent stack terminating as required for vent extensions through the roof. The relief pipe shall be sized to relieve air pressure inside the ejector to atmospheric pressure, but shall be not less than 11/4 inches (32 mm) in size.
UpCodes Diagrams (4)
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