Chapter General §101. Definitions [formerly paragraph 1: 001]



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§925. Battery Venting

A. A branch soil or waste pipe of uniform diameter throughout its length, to which are connected in battery a maximum of eight floor-level fixtures [floor outlet water closets, back outlet water closets (provided they connect horizontally into the battery vented section), floor drains, bathtubs, and showers] and which do not exceed 50 percent of the fixture units allowed by column two of Table 725.A.2 of this code, may be vented by a circuit or loop vent system connected downstream of the most upstream fixture drain (between the two uppermost fixture drains). In addition, battery vented branches on the top floor of a building and serving three or more fixtures shall be provided with a relief vent connected immediately downstream of the first downstream fixture connection of the battery vented section. When a battery vented branch is installed below the uppermost floor of the building, regardless of the number of fixtures served, it shall be provided with a relief vent connected immediately downstream of the first downstream fixture connection of the battery vented section. When lavatories or similar fixtures having a fixture unit rating of four or less and a maximum 2-inch fixture drain discharge from above such branches, each vertical branch shall be provided with a continuous vent. Such fixtures shall be located on the same floor as the battery vented group and the waste from such fixtures is required to enter the battery vented section from the horizontal. Fixtures having fixture unit ratings greater than four shall not discharge into such branch from above unless all fixtures in the battery group are individually vented. Fixtures from an upper floor or from an adjoining or other room(s) or space(s) (other than back-to-back installations, for example, back-to-back to bathrooms) shall not discharge into a battery vented branch. Floor level fixtures, including but not limited to floor drains, discharging downstream from a water closet shall be individually vented (see §925.C.5 of this code). Each fixture drain/trap which is connected to a battery vented soil or waste pipe branch shall conform with the distance of trap from vent requirements in Table 913.A of this code. The developed length distance from the weir of the trap or the flange of the water closet to the battery vented soil or waste pipe branch shall be used to determine compliance with Table 913.A of this code.

1. Exception. The relief vent, connected immediately downstream of the first downstream fixture connection of the battery vented section, may be omitted on a top floor installation of a battery vented section provided a stack vent or vent stack is located downstream of the first downstream horizontal fixture connection.

B. Vent Connections. Any vent or vents on the battery vented section shall be taken off from the vertical or at an angle not exceeding 45 degrees from the vertical in conformity with §909.B.1 of this code.

1. In addition, if a fixture having a fixture unit rating of four or less and a maximum 2-inch fixture drain discharge wastes into either the upper vent or the downstream relief vent of a battery vented section, the wet portion of such vent shall not be smaller than the horizontal battery branch.

a. Exception. The vent branch connection may be taken off horizontally provided it is washed by not more than four fixture units, other than water closets, and the wet portion of the vent is not smaller than the horizontal battery branch.

C. Fixtures Back-to-Back in Battery (see Figure 925.C of this code). Fixtures installed back-to-back in a battery vented system shall comply with the following.

1. A fixture connected to a horizontal branch through a vertical drain and a sanitary tee shall be vented in accordance with §913.A of this code.

2. Back-to-back fixtures connected to a horizontal branch through a single vertical drain shall enter the vertical drain through a sanitary cross, and a common vent for each two fixtures shall be provided. The common vent shall be installed as a continuation of the vertical drain.

3. A fixture connected to a horizontal branch through a wye or combination wye and one-eighth bend installed in a horizontal position need not be individually vented.

4. Back-to-back fixtures connected to a horizontal branch through a double wye or combination double wye and one-eighth bend installed in the horizontal position need not be provided with a common vent at the connection to the horizontal branch, except for the last two fixtures upstream. The vent shall be installed in a vertical position at the interconnection of the fixture drains or downstream of the interconnection in accordance with the distance of fixture trap from vent requirements in Table 913.A of this code.

5. In spite of §§925.C.3 and 925.C.4 of this code, the following floor level fixtures discharging downstream from a water closet shall be individually vented:

a. floor drains;

b. bathtubs;

c. showers;

d. floor sinks;

e. curbed cleaning facilities (i.e., floor-level mop sinks); and,

f. similar type fixtures.



Figure 925.CBattery Venting
AUTHORITY NOTE: Promulgated in accordance with R.S. 40:4(A)(7) and R.S. 40:5(2)(3)(7)(9)(16)(17)(20).

HISTORICAL NOTE: Promulgated by the Department of Health and Hospitals, Office of Public Health, LR 38:2865 (November 2012).

§927. Pneumatic Ejectors

A. Relief vents from a pneumatic ejector shall be carried separately to the open air.

AUTHORITY NOTE: Promulgated in accordance with R.S. 40:4(A)(7) and R.S. 40:5(2)(3)(7)(9)(16)(17)(20).

HISTORICAL NOTE: Promulgated by the Department of Health and Hospitals, Office of Public Health, LR 38:2866 (November 2012).

§929. Yoke Vents—Stacks of More Than 10 Branch Intervals

A. Soil and waste stacks in buildings having more than 10 branch intervals shall be provided with a yoke vent at each tenth interval installed, beginning with the top floor. The size of the yoke vent shall be equal to the size of the vent stack to which it connects. The lower end of each yoke vent shall connect to the soil or waste stack through a wye below the horizontal branch serving the floor, and the upper end shall connect to the vent stack through a wye not less than 3 feet (914 mm) above the floor and not less than 6 inches above the flood-level rim of the highest fixture served on the floor.

AUTHORITY NOTE: Promulgated in accordance with R.S. 40:4(A)(7) and R.S. 40:5(2)(3)(7)(9)(16)(17)(20).

HISTORICAL NOTE: Promulgated by the Department of Health and Hospitals, Office of Public Health, LR 38:2866 (November 2012).

§931. Offset Vents

A. General. In buildings five or more stories in height, offsets in vertical drainage piping having less than a 45° (0.785 rad) slope shall be vented in accordance with §931.B or §931.C, except as otherwise permitted by §727 of this code.

B. Separate Venting. Such offsets may be vented as two separate soil or waste stacks, namely the stack section below the offset and the stack section above the offset.

C. Offset Reliefs. Such offsets may be vented by installing a relief vent as a vertical continuation of the lower section of the stack or as a side vent connected to the lower section between the offset and next lower fixture or horizontal branch. The upper section of the offset shall be provided with a yoke vent. The diameter of the vents shall be not less than the diameter of the main vent, or of the soil and waste stack, whichever is the smaller.

AUTHORITY NOTE: Promulgated in accordance with R.S. 40:4(A)(7) and R.S. 40:5(2)(3)(7)(9)(16)(17)(20).

HISTORICAL NOTE: Promulgated by the Department of Health and Hospitals, Office of Public Health, LR 38:2866 (November 2012).

§933. Main Vents to Connect at Base

A. All main vents or vent stacks shall connect full size at their base to the building drain within 10 pipe diameters of the main soil or waste pipe or to the main soil or waste pipe, at or below the lowest fixture branch. All vent pipes shall extend undiminished in size to the vent terminal, or shall be reconnected with the main soil or waste vent.

AUTHORITY NOTE: Promulgated in accordance with R.S. 40:4(A)(7) and R.S. 40:5(2)(3)(7)(9)(16)(17)(20).

HISTORICAL NOTE: Promulgated by the Department of Health and Hospitals, Office of Public Health, LR 38:2866 (November 2012).

§935. Vent Headers

A. Stack vents and vent stacks may be connected into a common vent header at the top of the stacks and then terminate as required by this Chapter. This header shall be sized in accordance with the requirements of Table 937.B of this code, the number of units being the sum of all units on all stacks connected thereto, and the developed length being the longest vent length from the intersection at the base of the most distant stack to the vent terminal as a direct extension of one stack.

AUTHORITY NOTE: Promulgated in accordance with R.S. 40:4(A)(7) and R.S. 40:5(2)(3)(7)(9)(16)(17)(20).

HISTORICAL NOTE: Promulgated by the Department of Health and Hospitals, Office of Public Health, LR 38:2866 (November 2012).

§937. Size and Length of Vents

A. Length of Vent Stacks. The length of the vent stack or main vent shall be its developed length from the lowest connection of the vent system with the soil stack, waste stack, or building drain to the vent stack terminal, if it terminates separately, or to the connection of the vent stack with the stack vent, plus the developed length of the stack-vent from the connection to the terminal, if the two vents are connected together with a single extension.

B. Size of Stack-Vents, Vent Stacks, Relief Vents, Individual Vents or Branch Vents. The diameter of a stack-vent, vent stack, relief vent, individual vent or branch vent shall not be less than one-half of the diameter of the drain served, but in no case less than 1 1/4 inches, and shall be determined from its length and the total of fixture units connected thereto, as provided in Table 937.B of this code. All water closets vents shall be a minimum of 2 inches in diameter. This shall not be interpreted to allow the alteration or elimination of the need for at least one 3-inch vent stack or stack vent on the building drain as required under §905.C.1 of this code.

C. Size of Battery Vents. The diameter of a battery vent shall be not less than one-half the pipe size of the horizontal waste line it is venting, but in no case less than 1 1/2 inches, and shall be determined from its length and the total of fixture units connected thereto, as provided in Table 937.C of this code. The diameter and horizontal length of a battery vent shall in no case be less than permitted in Table 937.C of this code. (See §925 of this code).





Table 937.B

Maximum Length of Vents (ft)

(Other than Battery Vents)

(See Table 937.C of this Code for Battery Venting)

Size of Soil or Waste Stack (in)

Fixture Units Connected

Diameter of Vent Required (in)







1 1/4

1 1/2

2

2 1/2

3

4

5

6

8

1 ¼

2

30 ft

-

-

-

-

-

-

-

-

1 ½

8

50 ft

150 ft

-

-

-

-

-

-

-

1 ½

10

30 ft

100 ft

-

-

-

-

-

-

-

2

12

30 ft

75 ft

200 ft

-

-

-

-

-

-

2

20

26 ft

50 ft

150 ft

-

-

-

-

-

-

2 ½

42

-

30 ft

100 ft

300 ft

-

-

-

-

-

3

10

-

30 ft

100 ft

200 ft

600 ft

-

-

-

-

3

30

-

-

60 ft

200 ft

500 ft

-

-

-

-

3

60

-

-

50 ft

80 ft

400 ft

-

-

-

-

4

100

-

-

35 ft

100 ft

260 ft

1000 ft

-

-

-

4

200

-

-

30 ft

90 ft

250 ft

900 ft

-

-

-

4

500

-

-

20 ft

70 ft

180 ft

700 ft

-

-

-

5

200

-

-

-

35 ft

80 ft

350 ft

1000 ft

-

-

5

500

-

-

-

30 ft

70 ft

300 ft

900 ft

-

-

5

1100

-

-

-

20 ft

50 ft

200 ft

700 ft

-

-

6

350

-

-

-

25 ft

50 ft

200 ft

400 ft

1300 ft

-

6

620

-

-

-

15 ft

30 ft

125 ft

300 ft

1100 ft

-

6

960

-

-

-

-

24 ft

100 ft

250 ft

1000 ft

-

6

1900

-

-

-

-

20 ft

70 ft

200 ft

700 ft

-

8

600

-

-

-

-

-

50 ft

150 ft

500 ft

1300 ft

8

1400

-

-

-

-

-

40 ft

100 ft

400 ft

1200 ft

8

2200

-

-

-

-

-

30 ft

80 ft

350 ft

1100 ft

8

3600

-

-

-

-

-

25 ft

60 ft

250 ft

800 ft

10

1000

-

-

-

-

-

-

75 ft

125 ft

1000 ft

10

2500

-

-

-

-

-

-

50 ft

100 ft

500 ft

10

3800

-

-

-

-

-

-

30 ft

80 ft

350 ft

10

5600

-

-

-

-

-

-

25 ft

60 ft

250 ft



Table 937.C

Battery Vent Sizing Table

Maximum Horizontal Length (ft)

Soil or waste pipe diam. (in)

Maximum no. Fixture units

Diameter of circuit or loop vent (in)







1 1/2

2

2 1/2

3

4

5

2

3

15 ft

40 ft

-

-

-

-

2 1/2

6

10 ft

30 ft

-

-

-

-

3

10

-

20 ft

40 ft

100 ft

-

-

4

80

-

7 ft

20 ft

52 ft

200 ft

-

5

180

-

-

-

16 ft

70 ft

200 ft




AUTHORITY NOTE: Promulgated in accordance with R.S. 40:4(A)(7) and R.S. 40:5(2)(3)(7)(9)(16)(17)(20).

HISTORICAL NOTE: Promulgated by the Department of Health and Hospitals, Office of Public Health, LR 38:2866 (November 2012).



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