La. Admin. Code tit. 51 § XIV-727

Current through Register Vol. 50, No. 11, November 20, 2024

Section XIV-727 - Offsets in Drainage Piping in Buildings of Five Stories or More

A. Offsets of 45 Degrees or Less. An offset in a vertical stack, with a change of direction of 45° (0.785 rad) or less from the vertical, may be sized as a straight vertical stack. In case a horizontal branch connects to the stack within 2 ft (610 mm) above or below the offset, a relief vent shall be installed in accordance with §931. C of this code, except that when the offset stack is sized for a building drain (see Column 5 in Table 725.A.1 of this code) the relief vent may be omitted.

B. Above Highest Branch. An offset above the highest horizontal branch is an offset in the stack vent and shall be considered only as it affects the developed length of the vent.

C. Below Lowest Branch. In the case of an offset in a soil or waste stack below the lowest horizontal branch, no change in diameter of the stack because of the offset shall be required if it is made at an angle of not greater than 45° (0.785 rad) from the vertical. If such an offset is made at an angle greater than 45° (0.785 rad) from the vertical, the required diameter of the offset and the stack below it shall be determined as for a building drain (See Table 725.A.1 of this code).

D. Offsets of More Than 45 Degrees. A stack with an offset of more than 45° (0.785 rad) from the vertical shall be sized as follows:

1. The portion of the stack above the offset shall be sized as for a regular stack based on the total number of fixture units above the offset;

2. The offset shall be sized as for a building drain (See Column 5 in Table 725.A.1 of this code);

3. The portion of the stack below the offset shall be sized as for the offset or based on the total number of fixture units on the entire stack, whichever is larger (See Column 4 in Table 725.A.2 of this code); and,

4. A relief vent for the offset shall be installed as provided in Chapter 9 of this code and in no case shall a horizontal branch connect within the offset or within 2 feet (610 mm) above or below the offset.

E. Omission of Offset Reliefs. Offset relief vents required by §727. D of this code may be omitted by sizing the stack and its offset one pipe size larger than required for a building drain (See Column 5 in Table 725.A.1 of this code) but in no case shall the entire stack and offset be of less cross-sectional area than that required for a straight stack plus the area of an offset relief vent as provided in §931. B of this code. Omission of relief vents in accordance with this Subsection shall not constitute approval of horizontal branch connections within the offset or within 2 feet (610 mm) above or below the offset. See §727. A of this code for offsets of 45° (0.785 rad) or less.

La. Admin. Code tit. 51, § XIV-727

Promulgated by the Department of Health and Hospitals, Office of Public Health, LR 38:2855 (November 2012).

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