Engineered Bulk Material Handling

Bulk Material Handling Equipment

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Screw Conveyor Engineering Guide

Conveyor Capacity Table

Trough Loading

Screw Dia.

Max. Lump Size (In.)

Max. RPM

Capacity in Cu. Ft. Per Hr.

At Max. RPM

At 1 RPM

4

1/2

69

14.5

.21

6

3/4

66

49.5

.75

9

1-1/2

62

173

2.8

10

1-3/4

60

222

3.7

12

2

58

389

6.7

14

2-1/2

56

588

10.5

16

3

53

832

15.7

18

3-1/4

50

1,135

22.7

20

3-1/2

47

1,462

31.1

24

4

42

2,293

54.6

4

1/2

139

57

.41

6

3/4

132

198

1.5

9

1-1/2

122

683

5.6

10

1-3/4

118

849

7.2

12

2

111

1,476

13.3

14

2-1/2

104

2,194

21.1

16

3

97

3,046

31.4

18

3-1/4

90

4,086

45.4

20

3-1/2

82

5,092

62.1

24

4

68

7,426

109.2

4

1/2

69

28

.41

6

3/4

66

99

1.5

9

1-1/2

62

347

5.6

10

1-3/4

60

432

7.2

12

2

58

771

13.3

14

2-1/2

56

1,182

21.1

16

3

53

1,664

31.4

18

3-1/4

50

2,270

45.4

20

3-1/2

47

2,919

62.1

24

4

42

4,586

109.2

4

1/2

190

116

.61

6

3/4

182

413

2.27

9

1-1/2

170

1,360

8.0

10

1-3/4

165

1,782

10.8

12

2

157

3,030

19.3

14

2-1/2

148

4,558

30.8

16

3

140

6,524

46.6

18

3-1/4

131

8,659

66.1

20

3-1/2

122

11,590

95.0

24

4

105

17,535

167.0

95% Loaded Conveyors

Conveyor loadings may sometime exceed the recom­mended % of Loading, listed in the materials table. Considerations as to the material characteristics may justify up to 95% loading of tubular or shrouded con­veyors. The following table lists maximum speeds limited with regard to the percentage of loading nor­mally recommended for the specific listed materials.

 

Capacity Table For 95% Loaded Conveyors

Screw Dia.

Max. Lump Size (IN.)

Max. Recommended RPM

Capacity in Cubic Feet Per Hour

Normal % Loading *

Normal % Loading *

AT 1 RPM

15

30A

30B

45

15

30A

30B

45

4

1/4

76

89

80

96

96

113

101

122

1.27

6

3/8

67

78

70

84

318

370

332

399

4.75

9

3/4

58

68

61

73

974

1,142

1,024

1,226

16.8

10

7/8

55

65

58

70

1,309

1,547

1,380

1,666

23.8

12

1

49

58

52

62

1,999

2,366

2,122

2,530

40.8

14

1-1/4

43

51

46

55

2,804

3,325

2,999

3,586

65.2

16

1-1/2

38

45

40

48

3,762

4,455

3,960

4,752

99.0

18

1-3/4

32

38

34

41

4,512

5,358

4,794

5,781

141.0

20

2

26

31

28

34

5,226

6,231

5,628

6,834

201.0

24

3

21

25

23

28

7,434

8,850

8,142

9,912

354.0

* From the materials table