709.4 Values for indirect waste receptor.

The drainage fixture unit load of an indirect waste receptor receiving the discharge of indirectly connected fixtures shall be the sum of the drainage fixture unit values of the fixtures that discharge to the receptor, but not less than the drainage fixture unit value given for the indirect waste receptor in Table 709.1 or 709.2.

709.4.1 Clear-water waste receptors.

Where waste receptors such as funnel drains, floor sinks and hub drains receive only clear-water waste from display cases, refrigerated display cases, ice bins, coolers and freezers, such receptors shall have a drainage fixture unit value of one-half.

Section PC 710: Drainage System Sizing

710.1 Maximum fixture unit load.

The maximum number of drainage fixture units connected to a given size of building sewer, building drain or horizontal branch of the building drain shall be determined using Table 710.1(1). The maximum number of drainage fixture units connected to a given size of horizontal branch or vertical soil or waste stack shall be determined using Table 710.1(2).

Table 710.1(1)
Building Drains and Sewers

Diameter of Pipe (inches)	Maximum Number of Drainage Fixture Units Connected to any Portion of the Building Drain or the Building Sewer, Including Branches of the Building Drain a
	Slope per foot
	1/16 inch	1/8 inch	1/4 inch	1/2 inch
1 1/4	—	—	1	1
1 1/2	—	—	3	3
2	—	—	21	26
2 1/2	—	—	24	31
3	—	36	42	50
4	—	180	216	250
5	—	390	480	575
6	—	700	840	1,000
8	1,400	1,600	1,920	2,300
10	2,500	2,900	3,500	4,200
12	3,900	4,600	5,600	6,700
15	7,000	8,300	10,000	12,000

 

For SI: 1 inch = 25.4 mm, 1 inch per foot = 83.3 mm/m.

a.   The minimum size of any building drain serving a water closet shall be 3 inches.

Table 710.1(2)
Horizontal Fixture Branches and Stacks a

Diameter of Pipe (inches)	Total for horizontal branch	Maximum Number of Drainage Fixture Units (dfu)
		Stacks b
		Total for Stack of Three Branch Intervals or Less	Total for Stack Greater than Three Branch Intervals
1 1/2	3	4	8
2	6	10	24
2 1/2	12	20	42
3	20	48	72
4	160	240	500
5	360	540	1,100
6	620	960	1,900
8	1,400	2,200	3,600
10	2,500	3,800	5,600
12	2,900	6,000	8,400
15	7,000	Note c	Note c

 

For SI:1 inch = 25.4 mm

a.   Does not include branches of the building drain. Refer to Table 710.1(1).

b.   Stacks shall be sized based on the total accumulated connected load at each story or branch interval. No soil or waste stack shall be smaller than any horizontal branch connection thereto.

c.   Sizing load based on design criteria.

710.1.1 Horizontal stack offsets.

Horizontal stack offsets shall be sized as required for building drains in accordance with Table 710.1(1), except as required by Section 711.3.