906.5.1 Sewage pumps and sewage ejectors other than pneumatic.
PC § 906.5.1
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 906.5.1. Where a building sump vent connects to a sanitary vent system, the sanitary branch vent shall be at least 3 inches (76 mm) in diameter. Table 906.5.1Size and Length of Sump Vents Discharge Capacity of Pump(gpm)Maximum Developed Length of Vent (feet) aDischarge Capacity of Pump(gpm)Maximum Developed Length of Vent (feet) aDiameter of vent (inches)1 1/41 1/222 1/23410No limit bNo limitNo limitNo limitNo limitNo limit20270No limitNo limitNo limitNo limitNo limit4072160No limitNo limitNo limitNo limit603175270No limitNo limitNo limit801641150380No limitNo limit10010c2597250No limitNo limit150Not permitted10c44110370No limit200Not permittedNot permitted2060210No limit250Not permittedNot permitted1036132No limit300Not permittedNot permitted10c2288380400Not permittedNot permittedNot permitted10c44210500Not permittedNot permittedNot permittedNot permitted24130 For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon per minute = 3.785 L/m. a. Developed length plus an appropriate allowance for entrance losses and friction due to 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. b. Actual values greater than 500 feet. c. Less than 10 feet.
