Surface Machinery and Methods for Oil-Well Pumping Page: 81
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are placed parallel to the shackle line which is midway between
them. This device is crude but serviceable. It is not only used
for line support but often as a hold-up post near the power, where
a shackle line leads to a well on lower ground. It is best suited
to regions with little soil where to drive or to concrete post hangers
in place would be difficult, or where timber is plentiful. However,
the swing post is not well suited to heavy duty and requires fre-
The tripod pendulum, Figure 11, B, is used under much the same
conditions as the swing post. The legs of the tripod are placed so
as to give best alignment and proper support to the shackle line.
They are generally made of split green timber, bolted together at
the top, and the shackle line is held up with a rope or steel-rod
pendulum. The tripod pendulum is suited to localities where the
frost line is deep or where to drive or to concrete a post hanger in
place is difficult.
The two-post pendulum, Figure 11, C, usually consists of two posts
driven or concreted in the ground about 2 feet apart with a cross-
piece bolted on the top; from the middle of the crosspiece the shackle
line is suspended by a steel rod with a hook and eye. Other pen-
dulums of this type, but of heavier construction, are shown in Plate
XIX, B, at b.
Still other types eliminate the crosspiece at the top by the use of
two pieces of old pipe with the upper ends flattened and bolted
together-the shackle line being supported by a steel-rod pendulum
as shown in Plate XX, B, at b. Under favorable conditions, this
type of two-post pendulum is highly satisfactory for heavy duty and
A one-post pendulum for supporting a shackle line is shown in
Plate XX, B, at c (p. 76), and Plate XXI, C, at a (p. 77), as made
from old pipe; and in Plate XVIII, C, at a, as made of timber with
a short bolted cross arm. At some places these one-post pendulums
are concreted in position; in California many companies place the
wooden ones in dug holes and tamp them in place with oil sand
from the well sumps.
In California 4-inch by 4-inch Oregon pine, redwood, or cedar
posts are commonly set 4 feet in the ground; they extend 5 to
10 feet above the ground, depending on the topography. Most of
them are spaced 25 feet apart and are painted once or twice
a year with crude oil,
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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/m1/110/: accessed February 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.