...

Pipe Pressure Drop

Pipe Pressure Drop (Schedule 40 Steel Pipe)

The tables in this section provide the air pressure drop in pounds per square inch for a 100 foot length of Schedule 40 Steel Pipe. For lengths other than 100 feet, the pressure drop is proportional to the ratio of difference in lengths.

 

Example:

For 50 feet of pipe, the pressure drop will be approximately one-half the value given in the table.

For 300 feet of pie, the pressure drop will be approximately three times the value given in the table.

 

1/8" Schedule 40 Pipe - .269 actual I.D.

Free Air

(SCFM)

Line Pressure (PSIG)

40

50

60

70

80

90

100

110

1

0.757

0.64

0.554

0.489

0.437

0.395

0.361

0.332

2

2.747

2.323

2.011

1.774

1.587

1.435

1.31

1.205

3

6.416

5.425

4.697

4.144

3.706

3.352

3.06

2.815

4

10.128

8.564

7.414

6.541

5.85

5.291

4.83

4.444

5

15.622

13.209

11.436

10.089

9.023

8.162

7.45

6.854

6

22.227

18.794

16.271

14.354

12.839

11.612

10.6

9.752

8

39.002

32.978

28.551

25.188

22.528

20.377

18.6

17.112

1/4" Schedule 40 Pipe - .364 actual I.D.

Free Air

(SCFM)

Line Pressure (PSIG)

40

50

60

70

80

90

100

110

1

0.174

0.147

0.127

0.112

0.101

0.091

0.083

0.076

2

0.598

0.505

0.437

0.386

0.345

0.312

0.285

0.262

3

1.269

1.073

0.929

0.819

0.733

0.663

0.605

0.557

4

2.181

1.844

1.596

1.408

1.26

1.139

1.04

0.957

5

3.313

2.801

2.425

2.14

1.914

1.731

1.58

1.454

6

4.676

3.954

3.423

3.02

2.701

2.443

2.23

2.052

8

8.157

6.897

5.971

5.268

4.712

4.262

3.89

3.579

10

12.497

10.567

9.149

8.071

7.219

6.529

5.96

5.483

15

27.26

23.049

19.955

17.604

15.746

14.242

13

11.96

20

47.809

40.424

34.998

30.876

27.615

24.978

22.8

20.976

3/8" Schedule 40 Pipe - .493 actual I.D.

Free Air

(SCFM)

Line Pressure (PSIG)

40

50

60

70

80

90

100

110

1

0.038

0.032

0.028

0.024

0.022

0.02

0.018

0.017

2

0.134

0.113

0.098

0.087

0.078

0.07

0.064

0.059

3

0.279

0.236

0.204

0.18

0.161

0.146

0.133

0.122

4

0.474

0.401

0.347

0.306

0.274

0.248

0.226

0.208

5

0.719

0.608

0.527

0.464

0.415

0.376

0.343

0.316

6

0.856

0.723

0.626

0.553

0.494

0.447

0.408

0.375

8

1.778

1.504

1.302

1.148

1.027

0.929

0.848

0.78

10

2.642

2.234

1.934

1.706

1.526

1.38

1.26

1.159

15

4.676

3.954

3.423

3.02

2.701

2.443

2.23

2.052

20

9.981

8.439

7.307

6.446

5.765

5.215

4.76

4.379

23

13.231

11.188

9.686

8.545

7.643

6.913

6.31

5.805

25

15.391

13.014

11.267

9.94

8.89

8.041

7.34

6.753

30

22.017

18.617

16.118

14.219

12.718

11.503

10.5

9.66

35

29.776

25.177

21.797

19.23

17.199

15.556

14.2

13.064

40

38.583

32.623

28.244

24.917

22.286

20.157

18.4

16.928

45

48.438

40.956

35.459

31.282

27.979

25.306

23.1

21.252

1/2" Schedule 40 Pipe - .622 actual I.D.

Free Air

(SCFM)

Line Pressure (PSIG)

40

50

60

70

80

90

100

110

3

0.088

0.074

0.064

0.057

0.051

0.046

0.042

0.039

4

0.149

0.126

0.109

0.096

0.086

0.078

0.071

0.065

5

0.222

0.188

0.163

0.144

0.128

0.116

0.106

0.098

6

0.31

0.262

0.227

0.2

0.179

0.162

0.148

0.136

8

0.535

0.452

0.391

0.345

0.309

0.279

0.255

0.235

10

0.746

0.631

0.546

0.482

0.431

0.39

0.356

0.328

15

1.749

1.479

1.28

1.129

1.01

0.914

0.834

0.767

20

2.999

2.535

2.195

1.936

1.732

1.567

1.43

1.316

25

4.634

3.918

3.392

2.993

2.677

2.421

2.21

2.033

30

6.605

5.585

4.835

4.266

3.815

3.451

3.15

2.898

35

8.912

7.535

6.524

5.755

5.148

4.656

4.25

3.91

40

11.512

9.734

8.427

7.435

6.649

6.014

5.49

5.051

45

14.469

12.234

10.592

9.344

8.357

7.559

6.9

6.348

50

17.803

15.053

13.032

11.497

10.283

9.301

8.49

7.811

60

25.582

21.631

18.727

16.521

14.777

13.365

12.2

11.224

70

34.599

29.255

25.328

22.344

19.985

18.076

16.5

15.18

80

44.873

37.942

32.849

28.98

25.92

23.444

21.4

19.688

90

56.616

47.871

41.445

36.563

32.702

29.579

27

24.84

3/4" Schedule 40 Pipe - .824 actual I.D.

Free Air

(SCFM)

Line Pressure (PSIG)

40

50

60

70

80

90

100

110

5

0.057

0.048

0.041

0.037

0.033

0.03

0.027

0.025

6

0.078

0.066

0.057

0.05

0.045

0.041

0.037

0.034

8

0.13

0.11

0.095

0.084

0.075

0.068

0.062

0.057

10

0.197

0.167

0.144

0.127

0.114

0.103

0.094

0.086

15

0.421

0.356

0.309

0.272

0.243

0.22

0.201

0.185

20

0.723

0.612

0.53

0.467

0.418

0.378

0.345

0.317

25

1.103

0.933

0.807

0.712

0.637

0.576

0.526

0.484

30

1.568

1.326

1.148

1.013

0.906

0.819

0.748

0.688

35

2.097

1.773

1.535

1.354

1.211

1.096

1

0.92

40

2.726

2.305

1.996

1.76

1.575

1.424

1.3

1.196

45

3.397

2.872

2.487

2.194

1.962

1.775

1.62

1.49

50

4.173

3.528

3.055

2.695

2.41

2.18

1.99

1.831

60

5.976

5.053

4.375

3.859

3.452

3.122

2.85

2.622

70

8.031

6.791

5.879

5.187

4.639

4.196

3.83

3.524

80

10.38

8.776

7.598

6.703

5.995

5.423

4.95

4.554

90

13.106

11.081

9.594

8.464

7.57

6.847

6.25

5.75

100

16.125

13.634

11.804

10.414

9.314

8.424

7.69

7.075

125

24.953

21.099

18.267

16.115

14.413

13.037

11.9

10.948

150

35.647

30.141

26.095

23.021

20.59

18.624

17

15.64

175

48.438

40.956

35.459

31.282

27.979

25.306

23.1

21.252

1" Schedule 40 Pipe - 1.049 actual I.D.

Free Air

(SCFM)

Line Pressure (PSIG)

40

50

60

70

80

90

100

110

50

1.212

1.025

0.887

0.783

0.7

0.633

0.578

0.532

60

1.717

1.452

1.257

1.109

0.992

0.897

0.819

0.753

70

2.307

1.95

1.689

1.49

1.332

1.205

1.1

1.012

80

2.999

2.535

2.195

1.936

1.732

1.567

1.43

1.316

90

3.774

3.191

2.763

2.438

2.18

1.972

1.8

1.656

100

4.634

3.918

3.392

2.993

2.677

2.421

2.21

2.033

125

7.108

6.01

5.204

4.591

4.106

3.714

3.39

3.119

150

10.212

8.635

7.475

6.595

5.899

5.335

4.87

4.48

175

13.839

11.702

10.131

8.938

7.994

7.23

6.6

6.072

200

17.907

15.141

13.109

11.565

10.344

9.356

8.54

7.857

225

22.646

19.148

16.578

14.625

13.081

11.832

10.8

9.936

250

27.889

23.581

20.416

18.011

16.109

14.57

13.3

12.236

275

33.55

28.368

24.56

21.667

19.379

17.528

16

14.72

300

39.841

33.687

29.165

25.73

23.013

20.815

19

17.48

325

46.761

39.538

34.231

30.198

27.01

24.43

22.3

20.516

350

54.1

45.743

39.603

34.938

31.249

28.264

25.8

23.736

 

My Cart

You have no items in your shopping cart.