Oil Field Engine News

(Page 2 of 3)

Russell Farmer
January/February 2004
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The book goes on to offer further advice for proper mixture control of Bessemer engines:

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'There is but one adjustment on the mixing valve and that is the butterfly valve in the air passage. This valve controls the amount of air in proportion to the amount of gas. There is one particular setting of this valve, which gives best results for a certain pressure of gas, and usually it can be found readily with experience.

Bessemer Engine Specifications

HP

Bore & Stroke

Speed

Flywheel Dia.

Flywheel weight

Shipping weight

5

5.5 x 7

300

36

250

1,050

8

6.5 x 9

250

44

371

1,900

10

7.5 x 10

225

52

460

2,500

12

7.5 x 12

200

56

640

3,250

15

8.5 x 15

190

68

865

4,450

20

9.5 x 15

180

70

1,000

5,300

22

10 x 15

180

70

1,000

5,400

25

10.5 x 16

180

72

1,350

6,070

30

11.5 x 16

180

74

1,550

7,500

35

12 x 16

180

74

1,550

8,000

'When pulling a full load with a gas pressure from 6 to 8 ounces, this valve should be wide open, and while the performance of the engine on light loads will be equally as satisfactory with the same setting, it is advisable to partly close the valve for continuous light load on account of the slight saving of gas thereby effected. The saving is due to the lowering of the mean effective pressure in the charging end of the cylinder caused by lowering its volumetric efficiency, and at the same time lowering the transfer pressure.

'Consequently, the amount that the mean effective pressure is lowered decreases the negative work and adds just that much to the effective power of the engine. The approximate closing of the valve is inversely proportional to the load of the engine, i.e., for three-quarters load close the valve one-quarter, for one-half load close the valve one-half and for one-quarter load close the valve three-quarters. It must be remembered that when the load is variable the setting must be for the maximum load, or there will be danger of stalling the engine.'

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