SIZING TABLES

Sizing tables are often used when sizing vent pipes (Fig. 5.21). There can be many different types of tables to use during a sizing procedure. For example,

lVa

’Л

lVi

Unlimited

lVi

V4

1V2

Unlimited

2

Vi

1 Vi

290

2

Vi

lVi

Unlimited

3

Vi

1V2

97

3

Vi

2

420

3

Vi

3

Unlimited

4

Vi

2

98

4

Vi

3

Unlimited

4

Vi

4

Unlimited

Drain pipe size (in)

Drain pipe size

(in/ft)

Vent pipe size (in)

Maximum developed length of vent pipe (ft)

FIGURE 5.21 ■ Vent sizing table for Zone Three (for use with individual, branch, and circuit vents for horizontal drain pipes). (Courtesy of McGraw-Hill)

Подпись: Wet-vented fixtures 1 to 2 Bathtubs or showers 3 to 5 Bathtubs or showers 6 to 9 Bathtubs or showers 10 to 16 Bathtubs or showers Подпись: Stack size required (inches) 2 2 Vi 3 4

you might use one table to size a vent stack (Fig. 5.22) and another table to size a wet stack vent (Fig. 5.23). Some codes might use one table for both types of vents (Fig. 5.24). Then you might have a different table to use when sizing branch vents or circuit vents (Fig. 5.25). Battery vents may require a dif­ferent table (Fig. 5.26). Once you have a sizing table to work with, sizing a vent system is not a complicated process.

FIGURE 5.22 ■ Sizing a vent stack for wet-venting in Zone Two. (Courtesy of McGraw-Hill)

Pipe size of stack (inches)

Fixture-unit load on stack

Maximum length of stack

2

4

30

3

24

50

4

50

100

6

100

300

FIGURE 5.23 ■ Sizing a wet stack vent in Zone Two. (Courtesy of McGraw-Hill)

Drain pipe size (inches)

Fixture-unit load on drain pipe

Vent pipe size (inches)

Maximum developed length of vent pipe (feet)

VA

8

VA

50

VA

8

VA

150

VA

10

VA

30

llA

10

VA

100

2

12

VA

75

2

12

2

200

2

20

VA

50

2

20

2

150

3

10

VA

42

3

10

2

150

3

10

3

1040

3

21

VA

32

3

21

2

110

3

21

3

810

3

102

VA

25

3

102

2

86

3

102

3

620

4

43

2

35

4

43

3

250

4

43

4

980

4

540

2

21

4

540

3

150

4

540

4

580

FIGURE 5.24 ■ Vent sizing for Zone Three (for use with vent stacks and stack vents). (Courtesy of McGraw-Hill)

Drain pipe size (inches)

Drain pipe grade per foot (inches)

Vent pipe size (inches)

Maximum developed length of vent pipe (feet)

1У2

Vi

I1/*

Unlimited

VA

%

ІУ2

Unlimited

2

lA

lVi

290

2

‘A

VA

Unlimited

3

Vi

VA

97

3

Vi

2

420

3

‘/4

3

Unlimited

4

Vi

2

98

4

‘/4

3

Unlimited

4

Vi

4

Unlimited

FIGURE 5.25 ■ Vent sizing for Zone Three (for use with individual, branch, and circuit vents for horizontal drain pipes. (Courtesy of McGraw-Hill)

Updated: 15 ноября, 2015 — 10:12 дп