Quick pipe-sizing recommendations

From Waller

Nominal size, inches

Water, gal/min

Steam supply, lb/h

Condensate return, lb/h

Natural gas, ft3/h Fuel oil, gal/h

Branches

Mains

Low pressure

Medium pressure

LP system

MP system Low pressure 10% Dp over
a 500 ft EL
75-ft suction line (max. length)

EL = 50 ft
Dp = 10 ft H2O

Dp = 4 ft H2O per 100 ft

Dp = 0.25 psi per 100 ft

Dp = 1.0 psi per 100 ft

Dp = 0.12 psi per 100 ft

Dp = 1.0 psi per 100 ft 0.3 in WG Dp over a 200-ft EL 2 psi 10 psi No. 2 oil No. 4 oil No. 6 oil

0.5

3

1.5

-

-

95

92

26

-

-

40

-

-

0.75

7

3.5

24

45

210

200

55

-

-

145

-

-

1

13

7

46

89

400

380

100

320

938

360

20

-

1.25

25

13

96

199

840

800

210

660

1.925

500

60

-

1.5

40

20

147

309

1 270

1 200

320

980

2 884

750

110

35

2

75

40

285

627

2 500

2 350

610

1 900

5 555

-

210

90

2.5

120

60

460

1 033

4 030

3 780

980

3 000

8 850

-

300

190

3

220

110

810

1 880

7 200

6 730

1 700

5 300

15 600

-

-

350

4

450

220

1 690

4 000

14 900

13 800

3 500

10 900

31 900

-

-

-

6

1 200

650

4 850

12 000

44 300

19 600

10 300

31 900

93 500

-

-

-

8

1 400

1 400

10 000

25 000

91 700

40 500

21 000

65 500

192 000

-

-

-

10

2 400

2 400

18 200

47 000

164 000

72 000

-

119 000

349 000

-

-

-

12

4 000

4 000

28 400

74 000

261 000

116 000

-

188 000

552 000

-

-

-

14

5 000

5 000

42 100

105 000

384 000

190 000

-

-

-

-

-

-

16

7 000

7 000

59 000

147 000

541 000

239 000

-

-

-

-

-

-

18

10 000

10 000

80 000

155 000

568 000

251 000

-

-

-

-

-

-

20

14 000

14 000

-

-

-

-

-

-

-

-

-

-