Ordinance 348-75 - Laserfiche WebLink

TABLE 4-3 LISTS MAXIMUM UNIT LOADING & MAXIMUM LENGTH OF DRAINAGE & VENT PIPING Size of Pipe (inches) 14 11 2" 22" 3" 4" 5" 6" 8" 10" 12" Max. Units Drainage Pipingl Vertical 0 22 163 323 484 256 600 1380 3600 5600 8400 Horizontal5 0 1 83 143 354 216 428 720 2640 4680 8200 Max. Length (Feet) Drainage Piping Vertical 0 65 85 148 212 300 390 510 750 Horizontal Unlimited Vent Piping Horizontal & Vertical Max. Units 16 83 24 48 84 256 600 1380 3600 Max. Lengths 456 60 120 180 212 300 390 510 750 (See Note) 1Excluding trap arm 2Except sinks & urinals 3Except six-unit traps or water closets. 4Only four water closets or six-traps allowed on any vertical pipe or stack and not to exceed three water closets or six-unit traps on any horizontal branch or drain provided any one of the three discharges is separated from the other two by a miminum horizontal developed length of fifteen (15) feet whether connecting to vertical or horizontal piping. 5Based upon one-fourth inch (a" ) per foot slope. For one-eighth (1/8" ) per foot slope multiply horizontal fixture units by a factor of 0. 8. NOTE: The diameter of an individual vent shall not be less than one and one-fourth (14") nor less than one-half the diameter of the drain to which it is connected. Fixture unit load values for drainage and vent piping shall be computed from Tables Nos. 4-1 and 4-2. Not to exceed one- third of the total permitted length of any vent may be installed in a hori- zontal position. When vents are increased one pipe size for their entire length, the maximum length limitations specified in this table to not apply. 6Vertical only. Section 25 That Chapter 6, Section 613, of the Uniform Plumbing Code herein adopted, is hereby amended to read as follows : "Section 613 - Vertical Wet Venting " (a) Wet venting is limited to vertical drainage piping receiving the discharge from the trap arm of 1 or 2 fixture unit fixutres that also serves as a vent for not to exceed four (4) fixtures. All wet vented fixtures must be on the same floor. " (b) The vertical piping between any two consecutive inlet levels shall be considered a wet vented section. Each wet vented section shall be a minimum of one (1) pipe size larger than its upper fixture inlet. The developed length between two such inlets shall at no time be greater then five (5) times the diameter of the intervening wet vented section.