Surface Machinery and Methods for Oil-Well Pumping Page: 31


held in alignment by an adjustable outboard bearing, c, firmly
mounted upon a concrete pier, d. The reversing mechanism consists
of a system of gears partly shown at e and f, a contracting band
clutch, g, controlled by an operating lever, A, manipulated from the
derrick floor. This lever has three positions, neutral or stationary
in the middle, rotating with the engine in the forward position, and
rotating counter to the engine with the rear position. When rotat-
ing with the engine all parts are locked together and the action is the
same as with the ordinary clutch. When rotating counter to the
engine the gears come into play. A deep flange, j, on the clutch side
of the pulley prevents the belt from coming in contact with the
The oiling system must be kept at the highest efficiency to obtain
the best results with the reversing gear, as lack of oil will soon cut
out the gears.
Gas must be delivered to a gas engine at constant pressure, there-
fore the gas lines should be free from leaks and the pressure should
be regulated at the engine. Most of the leaks in gas lines are due
to lack of care during installation. Pressure is regulated at the en-
gine either by a cast-iron dryometer or regulator, or by a fluid-sealed
gasometer. Some installations with high line pressure use both
at each engine.
Plate VII, A, shows such an installation in the Elk Hills oil fields,
California. As shown in this plate, d is the feeder from the gas
main, e is a vertical section of casing with a drain cock, f, used as
a chamber for drawing off water that may be entrained in the gas,
g is a pipe and valve used for supplying line gas pressure to the
engine in starting, A is a dryometer or regulator, j is a fluid-sealed
gasometer which by means of a connection to the throttle at k
controls the gas supply, and I is the gas pipe leading to the engine.
The dryometer A is used to reduce line pressure so that the fluid-
sealed gasometer j can be worked. For ordinary gas pressures either
a dryometer or a fluid-sealed gasometer can be used to insure a uni-
form gas pressure at the engine. Some manufacturers of gas engines
use the dryometer entirely for gas regulation; others specify no
special regulator.
The gas engine is often installed by one department, operated by
another, and repaired chiefly by still another, so that the blame for
engine trouble is often difficult to place. The installation should be
standard, it should be regularly inspected, and all parts repaired or


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George, H. C. Surface Machinery and Methods for Oil-Well Pumping, report, 1925; Washington D.C.. ( accessed April 24, 2018), University of North Texas Libraries, Digital Library,; crediting UNT Libraries Government Documents Department.