Table 2c

Standard Cubic Feet Per Minute Flow Rate For Gas
Based On A 6000 Feet Per Minute Velocity Through Sch. 40 Pipe

Pipe

Size

Absolute Pressure Of Flowing Gas - PSIA

25

50

75

100

150

200

250

300

400

500

600

700

1/4

7

15

22

30

44

59

74

89

118

147

177

206

3/8

13

27

41

54

81

108

135

162

216

270

324

376

1/2

22

43

65

86

129

172

215

258

344

430

516

602

3/4

38

75

113

151

226

302

378

453

604

755

906

1057

1

61

122

183

244

367

489

612

734

978

1222

1468

1712

1 1/4

106

212

318

423

635

847

1059

1270

1693

2115

2541

2964

1 1/2

144

288

432

576

864

1153

1442

1729

2304

2880

3459

4035

2

237

474

712

949

1425

1901

2376

2850

3798

4747

5701

6651

2 1/2

339

677

1016

1354

2033

2713

3391

4067

5420

6774

8134

9490

3

523

1045

1569

2091

3140

4189

5236

6280

8369

10459

12560

14654

3 1/2

700

1398

2099

2797

4199

5603

7003

8400

11194

13989

16799

19600

4

901

1800

2703

3602

5406

7213

9017

10815

14412

18011

21630

25235

5

1416

2828

4246

5659

8495

11334

14168

16992

22645

28300

33986

39650

6

2044

4084

6132

8172

12266

16367

20459

24538

32701

40867

49078

57257

8

3540

7074

10621

14153

21245

28346

35433

42498

56635

70779

84999

99165

10

5580

11150

16739

22307

33485

44677

55847

66982

89265

111557

133971

156298

12

7920

15825

23758

31661

47526

63411

79265

95070

126697

158336

190147

221840

Note:
To determine the flow rate for a steam or gas velocity other than 6000 fpm, multiply the value from the appropriate table by the ratio (R):

Where Vm is the intended velocity of the flow rate.

Table 2d

To determine the flow rate for a 6000 fpm velocity for pipe other than schedule 40, multiply the value from the appropriate table, by the value from the following table for the desire pipe schedule and size:

Pipe

Sch.

Pipe Size

1/4

3/8

1/2

3/4

1

11/4

11/2

2

21/2

3

31/2

4

5

6

8

10

12

80

.69

.74

.77

.81

.83

.86

.87

.88

.89

.89

.90

.90

.91

.90

.91

.91

.91

160

.56

.56

.60

.71

.69

.67

.74

.73

.73

.73

.73

.73

.72

.72

Dbl. Ex.

.16

.28

.33

.42

.47

.53

.51

.56

.59

.61

.65

.65

.65