Surface Machinery and Methods for Oil-Well Pumping Page: 99
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other fabric belts, and are well suited for transmitting power under
Balata belt consists of several plies or folds of cotton duck thor-
oughly impregnated with balata gum and solidified by pressure. The
belt surface is finished with a thin coating of the gum. This
type of belt is very good for general transmission service, especially
in places where it may be exposed to moisture. It is not well suited,
however, to temperatures above 110 F., as the balata gum that binds
the canvas plies together softens and the plies loosen and separate.
Therefore they are not suitable for steam-engine drive, or for use
in climates where summer temperatures are high.
Rubber belt consists of several plies of canvas coated with rubber
and vulcanized together under high pressure so that the rubber and
duck are firmly united. This type of belt is usually well suited to
transmission and general use. It can be used under temperatures up
to 200 F. without showing ill effects. In some makes of rubber
belting for oil-field service the canvas is interstitched.
Rubber belts probably vary more in quality than do any other
kinds of fabric belt. The strength of a rubber belt, like that of any
other belt made of canvas, lies chiefly in the canvas. Some rubber
belt is made with too much filler and too little rubber; in conse-
quence, adhesion of the canvas plies is poor and slippage results.
Great care should be used in selecting a rubber belt, as a poor, cheap
belt is not worth the cost of installation. Rubber belts for trans-
mission service are usually classified as rubber covered, when a
rubber cover is applied on the outside; as friction surface, when a
thin coating of the " friction " is used on the outside as well as be-
tween the plies; and as stitched and rubber coverecl, when the plies
are united with the "friction," stitched, and then covered with rubber.
Rubber belts of all these kinds are in use in the oil fields. The
second class, or friction-surface type, is generally the most eco-
nomical for this service.
Stitched canvas belts usually consist of several plies or thicknesses
of cotton duck, sewed or stitched together and treated with oil or
gums. These belts tend to stretch and shrink more with changes
in the weather than other fabrics. However, they are much used in
the oil fields. They are generally heavier and stiffer than the
others. Figure 14 shows the four different types of fabric belts
Rope belts are used in the oil fields to transmit power from the
band wheel to the bull wheel and to pull rods and tubing. They
usually consist of a suitable length of manila cable cut from the end
of a drilling cable. However, plain laid manila rope is best adapted
and is recommended for this service.
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George, H. C. Surface Machinery and Methods for Oil-Well Pumping, report, 1925; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc12407/m1/128/: accessed October 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.