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determine the minimum size of pipe for that branch, i.e. if two units - 1 ½”; if nine units, water closet not included - 2" pipe; for up to 35 units, water closet included, 3" or 4“; one water closet, 3" pipe; two or more water closets, 4".Table 3 shows how to size the soil or waste stack. Determine number of fixture units by Table 1 and find the proper size of stack in 3. No stack into which a water closet discharges should be less than 3" in diameter.The "branch interval" used in Table 3 means a vertical length of stack of not less than 8 feet, within which branches are connected. The total fixture units on all branches connected to a stack within any 8-foot length should not exceed the maximum permitted by the table in one branch interval.
DRAINAGE AND SEWERAGE SYSTEMSSizing For Plumbing
DRAINAGE AND SEWERAGE SYSTEMSSizing For PlumbingItem No.FIXTURETrap & Trap Arm SizeDrainage Fixture Units (DFU)1Bathtubs3822Bidets3823Clotheswashers*5124Dental units or cuspidors 3215Drinking fountains3116Floor drains5127Interceptor* for grease, oil, etc.5138Interceptor* for sand, auto wash, etc.7669Laundry tubs38210Mobile home park traps (one for each trailer)76611Receptors* (floor sinks), indirect waste receptors for refrigerators, coffee urns, water station, etc.38112Receptors*, indirect waste receptors for commercial sinks, dishwashers, air washers, etc.51313Shower, single stall51214Shower*, gang (one unit per head)5115Sinks, and/or dishwashers (residential) 51 mm min waste38216Sinks, bar, commercial 51 mm min. waste38217Sinks, bar, private 38 mm min waste38118Sinks, commercial or industrial, schools, etc., including dishwashers, wash up sink, and wash fountains 50.8 mm waste38319Sink, flushing rim, clinic76620Sink, service51321Urinal, pedestal, trap arm only76622Urinal, stall, separate trap51223Urinal, wall-mounted, integral trap, trap arm only51324Urinal, wall-mounted, blowout, integral trap, trap arm only 76625Urinal, wall-mounted, washdown or siphon jet, integral trap, tram arm only51226Urinal, wall-mounted, washout, separate trap 50.8 mm min. waste38227Wash basin, in sets38228Wash basin (lavatory) single32129Water closet,* private installation76430Water closet, public installation 766MINIMUM TRAP DIAMETERS AND DRAINAGE FIXTURE UNIT VALUES(NPCP 1995 ed.)
DRAINAGE AND SEWERAGE SYSTEMSSizing House DrainSize is determined by the number of units drained by it. Proper Ф are: 2 units, 1 1/2"; 9 units, 2"; 25 units, 2 1/2". The size of stack, house drain, or sewer must be at least the size of the largest branch connected to it. The minimum size of a house drain receiving discharge from a WC should be 4" Ф, and should continue full size to the vertical stacks receiving the discharge of water closets. The drainage system should have one 3" Фstack extended full size through the roof (w/o any WC)Sizing Vent PipeThe proper size for vent stack is determined by the total fixture units of the soil/waste stack it serves. A branch vent is sized by the number of units connected to it and the length of the pipe itself. No vent pipe should be less than 1 1/4" Ф, nor should a