e if two units 1 \u00bd if nine units water closet not included 2 pipe for up to 35

E if two units 1 ½ if nine units water closet not

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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.
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DRAINAGE AND SEWERAGE SYSTEMS Sizing For Plumbing
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DRAINAGE AND SEWERAGE SYSTEMS Sizing For Plumbing Item No. FIXTURE Trap & Trap Arm Size Drainage Fixture Units (DFU) 1 Bathtubs 38 2 2 Bidets 38 2 3 Clotheswashers* 51 2 4 Dental units or cuspidors 32 1 5 Drinking fountains 31 1 6 Floor drains 51 2 7 Interceptor* for grease, oil, etc. 51 3 8 Interceptor* for sand, auto wash, etc. 76 6 9 Laundry tubs 38 2 10 Mobile home park traps (one for each trailer) 76 6 11 Receptors* (floor sinks), indirect waste receptors for refrigerators, coffee urns, water station, etc. 38 1 12 Receptors*, indirect waste receptors for commercial sinks, dishwashers, air washers, etc. 51 3 13 Shower, single stall 51 2 14 Shower*, gang (one unit per head) 51 15 Sinks, and/or dishwashers (residential) 51 mm min waste 38 2 16 Sinks, bar, commercial 51 mm min. waste 38 2 17 Sinks, bar, private 38 mm min waste 38 1 18 Sinks, commercial or industrial, schools, etc., including dishwashers, wash up sink, and wash fountains 50.8 mm waste 38 3 19 Sink, flushing rim, clinic 76 6 20 Sink, service 51 3 21 Urinal, pedestal, trap arm only 76 6 22 Urinal, stall, separate trap 51 2 23 Urinal, wall-mounted, integral trap, trap arm only 51 3 24 Urinal, wall-mounted, blowout, integral trap, trap arm only 76 6 25 Urinal, wall-mounted, washdown or siphon jet, integral trap, tram arm only 51 2 26 Urinal, wall-mounted, washout, separate trap 50.8 mm min. waste 38 2 27 Wash basin, in sets 38 2 28 Wash basin (lavatory) single 32 1 29 Water closet,* private installation 76 4 30 Water closet, public installation 76 6 MINIMUM TRAP DIAMETERS AND DRAINAGE FIXTURE UNIT VALUES (NPCP 1995 ed.)
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DRAINAGE AND SEWERAGE SYSTEMS Sizing House Drain Size 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" Ф stack extended full size through the roof (w/o any WC) Sizing Vent Pipe The 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
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