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P3113.4.1 Sewage Pumps and Sewage Ejectors Other Than Pneumatic
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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.
TABLE P3113.4.1
SIZE AND LENGTH OF SUMP VENTS| 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.
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