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Minnesota Administrative Rules

4715.2310 SELECTING SIZE OF GRAVITY DRAINAGE PIPING.

Subpart 1.

Determination of size.

Pipe sizes for gravity drains shall be determined from subparts 2 and 3 on the basis of drainage load computed from part 4715.2300, subparts 2 and 3.

Subp. 2.

Maximum loads for horizontal drains in fixture units.

Building Sewer*****, Building Drain and
Building Drain Branches - from Stacks****
Diameter
of Drain
Horizontal Fixture Branch*- Slope
(inches) (f.u.) 1/16
in/ft.
(f.u.)
1/8
in/ft.
(f.u.)
1/4
in/ft.
(f.u.)
1/2 in/ft.
(f.u.)
1-1/4 1
1-1/2 3
2 6 21 26
2-1/2 12 24 31
3** 32*** 36*** 42*** 50***
4 160 180 216 250
5 360 390 480 575
6 620 700 840 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

*Includes Horizontal Branches of the Building Drain.

**No water closet shall discharge into a drain less than 3 inches.

***Not over 2 Water Closets.

****Every building drain that receives the discharge of (3) or more water closets, shall not be less than 4 inches in diameter.

*****No building sewer shall be less than 4 inches in diameter.

Subp. 3.

Maximum loads for soil and waste stacks in fixture units.

Diameter of Stack Stacks of not more than 3 stories or Branch Intervals Stacks of more than 3 stories or Branch Intervals Total at One Story or Branch Interval
1-1/4* 2 2 1
1-1/2* 4 4 2
2* 9 18 6
2-1/2* 20 42 9
3 36*** 72*** 24**
4 240 500 90
5 540 1,100 200
6 960 1,900 350
8 --- 3,600 600
10 --- 5,600 1,000
12 --- 8,400 1,500

*No water closets permitted.

**Not over 2 water closets permitted.

***Not over 6 water closets permitted, and not over 6 branch intervals on a 3 inch soil stack.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326.37 to 326.45; 326B.101; 326B.106; 326B.13; 326B.43 to 326B.49

History:

28 SR 146; L 2007 c 140 art 4 s 61; art 6 s 15; art 13 s 4; 33 SR 2042

Published Electronically:

May 14, 2012

700 State Office Building, 100 Rev. Dr. Martin Luther King Jr. Blvd., St. Paul, MN 55155 ♦ Phone: (651) 296-2868 ♦ TTY: 1-800-627-3529 ♦ Fax: (651) 296-0569