4 inches TABLE 702.1 DRAINAGE FIXTURE UNIT VALUES (DFU) - Private PLUMBING FIXTURE MIN. SIZE TRAP ARM PRIVATE DFU Bathtub/Shower (BT) 1 ½ 2.0 Lavatory single (LAV) 1 ¼ 1.0 Sink domestic (KS) 1 ½ 2.0 – Water closet (WC) 3 3.0 Clothes Washer (ACW) 2 3.0 703.2 Cross Sectional Area Table MAX. UNIT LOADING AND MAX. LENGTH OF VENT PIPING Standard Cross Sectional SIZE OF PIPE 1 ¼ 1 ½ 2 3* 4 Pipe Dia. Area (inches) 1 ½” 1.77 sq. in. Maximum DFUs Drainage Piping 2” 3.14 sq. in Vertical 1 2 16 48 256 Horizontal 1 1 8 35 216 3” 7.07 sq. in. Vent Piping 4” 12.56 sq. in. Horizontal and Vertical Maximum DFUs 1 8 24 84 256 3 inches Maximum Lengths (feet) 45 60 120 212 300 4 inches Questions 10-14 are to correctly size the above Minimum size for vent B is: double bath system diagram. 1 ¼ inches Vertical height 18 feet – 1 ½ inches The total DFU load for this system is: 2 inches 3.0 3 inches 11.0 4 inches 14.0 17.0 22.0 Minimum size building sewer is: 1 ½ inch 2 inch Minimum size for vent C is: 3 inch 1 ¼ inches 4 inch 1 ½ inches 6 inch 2 inches 3 inches Minimum size for vent A is: 4 inches 1 ¼ inches 1 ½ inches 2 inches
4 inches TABLE 702.1 DRAINAGE FIXTURE UNIT VALUES (DFU) - Private PLUMBING FIXTURE MIN. SIZE TRAP ARM PRIVATE DFU Bathtub/Shower (BT) 1 ½ 2.0 Lavatory single (LAV) 1 ¼ 1.0 Sink – domestic (KS) 1 ½ 2.0 Water closet (WC) 3 3.0 Clothes Washer (ACW) 2 3.0 Cross Sectional Area Table Standard Pipe Dia. Cross Sectional Area 1 ½” 1.77 sq. in. 2” 3.14 sq. in 3” 7.07 sq. in. 4” 12.56 sq. in. 703.2 MAX. UNIT LOADING AND MAX. LENGTH OF VENT PIPING SIZE OF PIPE (inches) 1 ¼ 1 ½ 2 3* 4 Maximum DFUs Drainage Piping Vertical Horizontal 1 1 2 1 16 8 48 35 256 216 Vent Piping Horizontal and Vertical Maximum DFUs Maximum Lengths (feet) 1 45 8 60 24 120 84 212 256 300 Questions 10-14 are to correctly size the above double bath system diagram. Vertical height – 18 feet The total DFU load for this system is: 3.0 11.0 14.0 17.0 22.0 Minimum size building sewer is: 1 ½ inch 2 inch 3 inch 4 inch 6 inch Minimum size for vent A is: 1 ¼ inches 1 ½ inches 2 inches 3 inches 4 inches Minimum size for vent B is: 1 ¼ inches 1 ½ inches 2 inches 3 inches 4 inches Minimum size for vent C is: 1 ¼ inches 1 ½ inches 2 inches 3 inches 4 inches
2015%20UPC%20Chapter%209%20Venting%20SD%20Questions.docx