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  PUMPING TABLE
 

After numerous pumping tests against other makes of mills, the founders, Sidney Williams & Co, were so confident about the superiority of the Comet that in 1934 they published a challenge, which has never been accepted over 125 years. The challenge was:

‘Install a Comet and any other standard mill of the same size adjacent to it so that both mills work under identical pumping and wind conditions and if, after a period of three months trial, the Comet does not pump at least 25% more water we will remove it at no cost to you.’

 

The pumping capacities of Comet Mills, shown in the Table, are based on the number of pumping strokes (total inches) in 12-14 m.p.h. (19-22 k.m.p.h) winds blowing an average 10 hours in each 24 hour day and also allow for slip/friction. However, the pump sizes and elevations are such that with balanced pump rods and free pressure sealing devices the mills will start pumping in light breezes of under 8 m.p.h. (12.8 k.m.p.h).

 

 
 

PUMP SIZE

Inches

mm

8ft

2.44m

Ft         gal

Mt          L

10ft

3.05m

Ft          gal

Mt           L

12ft

3.66m

Ft          gal

Mt           L

14ft

4.27m

Ft           gal

Mt           L

16ft

4.88m

Ft          gal

Mt           L

18ft

5.49m

Ft          gal

Mt           L

20ft

6.10m

Ft          gal

Mt           L

22ft

6.71ft

Ft           gal

Mt           L

24ft

7.32m

Ft          gal

Mt           L

27ft

8.23ft

Ft           gal

Mt            L

30ft

9.14m

Ft           gal

Mt            L

1¾

44

157

48

970

4410

270

82

1000

4550

355

108

1080

4910

508

155

1170

5320

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

50

124

38

1280

5820

220

67

1320

6000

279

85

1420

6460

410

125

1540

7000

548

167

2100

9550

710

216

1880

8550

 

 

 

 

 

 

 

 

 

 

2¼

57

100

31

1620

7370

178

54

1670

7590

225

69

1780

8090

328

100

1940

8820

454

138

2680

12180

610

186

2380

12180

795

242

2780

12640

 

 

 

 

 

 

 

 

2½

65

86

26

2000

9090

144

44

2060

9370

193

59

2200

10000

290

88

2300

10460

377

115

3300

15000

520

159

2940

13370

690

210

3440

15640

793

242

3820

17370

 

 

 

 

 

 

2¾

70

75

23

2420

11000

123

38