7.6.3.2.Hydraulic Load

(1) Except as provided in Sentence (3), the hydraulic load of a fixture or device that is listed in Table 7.6.3.2.-A shall be the number of fixture units given in the Table. (2) Except as provided in Sentences (1) and (3), the hydraulic load of a fixture that is not listed in Table 7.6.3.2.-A is the number of fixture units listed in Table 7.6.3.2-.D. (3) Where fixtures are supplied with both hot and cold water, the hydraulic loads for maximum separate demands shall be 75% of the hydraulic load of the fixture units given in Tables 7.6.3.2.-A and 7.6.3.2.-D when using a detailed engineering design method. (4) The hydraulic load of urinals and water closets with direct flush valves shall be the number of fixture units listed in Tables 7.6.3.2.-B and 7.6.3.2.-C. (See Note A- 7.6.3.2.(4)) Table 7.6.3.2.-A Sizing of Water Distribution Systems(1)(2) Forming Part of Sentences 7.6.3.2.(1), (2) and (3) and 7.6.3.4.(2), (3) and (5) Minimum Private Use Hydraulic Load, Public Use Hydraulic Load, Nominal Pipe fixture units fixture units Fixture or Device Size of Supply Pipe, NPS Cold Hot Total Cold Hot Total Bathroom group with 6 LPF flush tank(3) n/a 2.7 1.5 3.6 n/a n/a n/a Bathroom group with greater than 6 LPF n/a 4 3 6 n/a n/a n/a flush tank(3) Bathroom group with more than 3 fixtures n/a n/a n/a (4) n/a n/a n/a Bathtub with or without shower head 1 /2 1 1 1.4 3 3 4 Bathtub with NPS ¾ spout 3 /4 7.5 7.5 10 7.5 7.5 10 Bedpan washer 1 n/a n/a n/a 7.5 7.5 10 Bidet 3 /8 1.5 1.5 2 n/a n/a n/a Clothes washer, 3.5 kg 1 /2 1 1 1.4 2.25 2.25 3 Clothes washer, 6.8 kg 1 /2 n/a n/a n/a 3 3 4 Clothes washer, commercial(5) n/a n/a n/a n/a n/a n/a n/a Dental lavatory 3 /8 n/a n/a n/a 1.5 1.5 2 Dental unit, cuspidor 3 /8 n/a n/a n/a 1 n/a 1 Dishwasher, commercial(5) n/a n/a n/a n/a n/a n/a n/a Dishwasher, domestic 3 /8 n/a 1.4 1.4 n/a n/a n/a Drinking fountain or water cooler 3 /8 n/a n/a n/a 0.25 n/a 0.25 Hose bibb 1 /2 2.5 n/a 2.5 2.5 n/a 2.5 Hose bibb 3 /4 3 n/a 3 6 n/a 6 Hose bibb, combination hot and cold 1 /2 1.9 1.9 2.5 1.9 1.9 2.5 Lavatory, 8.3 LPM or less 3 /8 0.5 0.5 0.7 1.5 1.5 2 Lavatory, greater than 8.3 LPM 3 /8 0.75 0.75 1 1.5 1.5 2 Shower head, 9.5 LPM or less per head 1 /2 1 1 1.4 3 3 4 Shower head, greater than 9.5 LPM per 1 /2 1.5 1.5 2 3 3 4 head Shower, spray, multi-head, fixture unit per (5) 1 1 1.4 3 3 4 head Sink, bar 3 /8 0.75 0.75 1 1.5 1.5 2 Sink, clinic service faucet 1 /2 n/a n/a n/a 2.25 2.25 3 Sink, clinic service with direct flush valve 1 n/a n/a n/a 6 n/a 6 Sink, kitchen, commercial, per faucet 1 /2 n/a n/a n/a 3 3 4 Sink, kitchen, domestic, 8.3 LPM or less 3 /8 1 1 1.4 1 1 1.4 Sink, kitchen, domestic, greater than 3 /8 1.5 1.5 2 1.5 1.5 2 8.3 LPM Sink, laboratory 3 /8 n/a n/a n/a 1.5 1.5 2 Sink, laundry (1 or 2 compartments) 3 /8 1 1 1.4 1 1 1.4 Sink, service or mop basin 1 /2 n/a n/a n/a 2.25 2.25 3 Sink, washup, per faucet 1 /2 n/a n/a n/a 1.5 1.5 2 Table 7.6.3.2.-A (Cont'd) Sizing of Water Distribution Systems(1)(2) Forming Part of Sentences 7.6.3.2.(1), (2) and (3) and 7.6.3.4.(2), (3) and (5) Minimum Private Use Hydraulic Load, Public Use Hydraulic Load, Nominal Pipe fixture units fixture units Fixture or Device Size of Supply Pipe, NPS Cold Hot Total Cold Hot Total Urinal, with direct flush valve 3 /4 (6) n/a (6) (6) n/a (6) Urinal, with flush tank 3 /8 3 n/a 3 3 n/a 3 Urinal, with self-closing metering valve 1 /2 2 n/a 2 4 n/a 4 Water closet, 6 LPF or less with flush tank 3 /8 2.2 n/a 2.2 2.2 n/a 2.2 Water closet, greater than 6 LPF with 3 /8 3 n/a 3 5 n/a 5 flush tank Water closet, with direct flush valve 1 (6) n/a (6) (6) n/a (6) Notes to Table 7.6.3.2.-A: (1) The fixture unit values in this Table are not applicable in certain assembly occupancies because of surges in use by the occupants. For such occupancies, refer to specific design information. (2) For fixtures not indicated in this Table, refer to Table 7.6.3.2.-D. (3) Bathroom group is based on NPS ½ bathtub supply pipe. (4) Add additional fixture to the fixture load for bathroom group. (5) Refer to the manufacturer’s recommendations. (6) For fixture unit values for fixtures with direct flush valves, see Sentence 7.6.3.2.(4) and Tables 7.6.3.2.-B and 7.6.3.2.-C. Table 7.6.3.2.-B Sizing of Water Distribution Systems for Urinals with Direct Flush Valves Forming Part of Sentences 7.6.3.2.(4) and 7.6.3.4.(5) Individual Fixture Units Assigned in Number of Valves Fixture Units in Accumulative Values(1) Decreasing Values 1 20 20 2 15 35 3 10 45 4 8 53 5 or more 5 each 58, plus 5 for each additional fixture in excess of 5 Notes to Table 7.6.3.2.-B: (1) The accumulative fixture unit values are the total values to be used in conjunction with Table 7.6.3.2.-A. Table 7.6.3.2.-C Sizing of Water Distribution Systems for Water Closets with Direct Flush Valves Forming Part of Sentences 7.6.3.2.(4) and 7.6.3.4.(5) Individual Fixture Units Assigned in Number of Valves Fixture Units in Accumulative Values(1) Decreasing Values 1 40 40 2 30 70 3 20 90 4 15 105 115, plus 10 for each public use 10 for each public use, additional fixture in excess of 5, 5 or more and and 6 for each private use 111, plus 6 for each private use additional fixture in excess of 5 Notes to Table 7.6.3.2.-C: (1) The accumulative fixture unit values are the total values to be used in conjunction with Table 7.6.3.2.-A. Table 7.6.3.2.-D Hydraulic Loads of Fixtures Not Listed in Table 7.6.3.2.-A Forming Part of Sentences 7.6.3.2.(2) and (3) and 7.6.3.4.(5) Hydraulic Load, fixture units Nominal Pipe Size of Supply Pipe, NPS Private Use Public Use ⅜ 1 2 ½ 2 4 ¾ 3 6 1 6 10