The Ontario Building Code | Hydraulic Loads to Soil or Waste Pipes

7.4.10.6. Hydraulic Loads to soil or Waste pipes

(1) Except as provided in Sentence (2), the hydraulic load that is drained to every soil or waste stack shall conform to Table 7.4.10.6.

Table 7.4.10.6.
Maximum Permitted Hydraulic Load Drained to soil or Waste Stack

Forming Part of Sentence 7.4.10.6.(1)

Item

Column 1

pipe Size, in.

Column 2

Maximum Hydraulic Load, fixture units

Column 3

Maximum Fixture Units Drained from any one Storey

1.

1 ¼

2

2

2.

1 ½

8

5

3.

2

24

10

4.

3

102

18

5.

4

540

100

6.

5

1 400

250

7.

6

2 900

500

8.

8

7 600

830

9.

10

15 000

2 700

10.

12

26 000

4 680

11.

15

50 000

9 000

(2) Where the nominally horizontal offset in a soil or waste stackis 1 500 mm or more, the hydraulic load that is served by it shall conform to Table 7.4.10.8.

(3) Vertical sanitary drainage pipe shall be designed to carry no more than 29% of its full capacity.