11.5 DETERMINING DRAINAGE PIPE SIZES 11.5.1 Selecting the Size of Drainage Piping Pipe sizes shall be determined from Table 11.5.1 A and 11.5.1 B on the basis of the drainage fixture unit load (DFU) computed from Table 1104. I and Section 1 I.4.1. Sanitary drainage pipe sizes shall not be reduced in the direction of flow. EXCEPTION: Drain pipe sizes for individual fixtures shall be not less than the minimum trap size required in Section 5.2. See Figures 11.5.1 - A and -B Table 11.5.1A BUILDING DRAlNS ANDSEWERS' Maximum Number of Drainage Fixture Units (DFU) That May Be Connected to Any Portion of the Building Drain or the Building Sewer. Pipe Size- lnches 2 3 4 5 6 8 10 12 15 1116-lnch 1,400 2,500 3,900 7,000 1/8-lnch 180 390 700 1,600 2,900 4,600 8,300 Slope Per Foot 114-lnch 21 42' 216 480 840 1,920 3,500 5,600 10,000 112-lnch 26 50' 250 575 1,000 2,300 4,200 6,700 12,000 I. On-site sewers that serve more than one building may be sized according to the current standards and specifications of the Authority Having Jurisdiction for the public sewers. 2. See Sections IJ.5.6.d, II.S.6.e, and 11.5.6.f. Table 1l.5.1B HORIZ0NTAL FIXTURE BRANCHES AND STACKS Maximum Number of Drainage FIXture Units (DFU) Thai May Be Connected To: Stacks with Mort> Than Three One Stack of Branch Intervals Any Three Branch Pipe Size- Horizontal Intervals or Total at One Inches Fixture Branch' Less Total for Stack Branch Intervals P/4 J I I I j1h 3 4 8 2 2 6 10 24 6 3 20' 48' 72' 20 3 4 160 240 500 90 5 360 540 1,100 200 6 620 960 1,900 350 8 1.400 2.200 3.600 600 10 2,500 3.800 5,600 1,000 12 3.900 6.000 8,400 1,500 15 7,000 I Does not include branches of the building dram. , See Section 11.5.6.b. 3. See Section 11.5.6.c. 2006 NatiUlwl Standard Plumbing Code-Illustrated 255

2006 National Standard Plumbing Code ILLUSTRATED 255

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11.5 DETERMINING DRAINAGE PIPE SIZES

11.5.1 Selecting the Size ofDrainage Piping

Pipe sizes shall be determined from Table 11.5.1 A and 11.5.1 B on the basis ofthe drainage fixture unit load(DFU) computed from Table 1104. I and Section 1I.4.1. Sanitary drainage pipe sizes shall not be reduced inthe direction offlow.EXCEPTION: Drain pipe sizes for individual fixtures shall benot less than the minimum trap size required inSection 5.2. See Figures 11.5.1 - A and - B

Table 11.5.1ABUILDING DRAlNS AND SEWERS'

Maximum Number of Drainage Fixture Units (DFU) That May BeConnected to Any Portion of the Building Drain or the Building Sewer.

Pipe Size

lnches234568

101215

1116-lnch

1,4002,5003,9007,000

1/8-lnch

180390700

1,6002,9004,6008,300

Slope Per Foot

114-lnch21

42'216480840

1,9203,5005,600

10,000

112-lnch2650'2505751,0002,3004,2006,70012,000

I. On-site sewers that serve more than one building may be sized according to the current standards and specificationsof the Authority Having Jurisdiction for the public sewers.

2. See Sections IJ.5.6.d, II.S.6.e, and 11.5.6.f.

Table 1l.5.1BHORIZ0NTAL FIXTURE BRANCHES AND STACKS

Maximum Number of Drainage FIXture Units (DFU) Thai May Be Connected To:

Stacks with Mort> Than ThreeOne Stack of Branch Intervals

Any Three BranchPipe Size- Horizontal Intervals or Total at One

Inches Fixture Branch' Less Total for Stack Branch Intervals

P/4 J I I Ij1h 3 4 8 22 6 10 24 63 20' 48' 72' 203

4 160 240 500 905 360 540 1,100 2006 620 960 1,900 3508 1.400 2.200 3.600 600

10 2,500 3.800 5,600 1,00012 3.900 6.000 8,400 1,50015 7,000

I Does not include branches of the building dram., See Section 11.5.6.b.3. See Section 11.5.6.c.

2006 NatiUlwl Standard Plumbing Code-Illustrated 255