Surface Machinery and Methods for Oil-Well Pumping Page: 106
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106 SURFACE MACHINERY AND METHODS FOR OIL-WELL PUMPING.
storms from the southwest. Of a total of 2,000 in the Sunset-Midway field,
940 rigs or 47 per cent were blown down, and many others badly strained.
I had occasion to inspect the wrecked derricks of a company that had lost
38 out of 150 or 25.3 per cent of its derricks.
In the 38 rig failures observed 94 guy wires had failed. Of this number
3 cases were not determinable, so that only the 91 determinable cases are
The investigation of the wrecked derricks showed that the various kinds of
failures may be grouped under four heads as follows:
Number of Total.
failures per cent.
1. Deadmen were pulled out of the ground ______________-61 67. 0
2. Guy wires broken when kinked or pulled loose by slipping
in a knot-- -------------------------------------26 28. 6
3. Guy wires broken by straight pull where no kink or sharp
bend could be observed ...... 2 2. 2
4. Deadmen so rotten that either the central part pulled
out, or the wire pulled through the deadmen-__ 2 2. 2
91 100. 0
Following the storm which caused so much damage to oil derricks, improved
methods of guying were used, embracing the following general features:
(1) Substantial deadmen that will neither pull out or decay during the life
of the well.
(2) A rod connecting the deadman to the guy wire so that the latter will not
be exposed to rust under the ground surface.
(3) Some method for tightening the guy wires that will not kink them, so
that the guy wires may be kept taut at all times. A slack guy wire that will
allow a derrick to sway is almost as bad as no wires at all.
(4) Absence of square knots anywhere in the wire.
(5) Three guy wires to each derrick leg.
No one of the various systems can be properly termed the best, since such
devices are usually built largely, if not entirely, out of scrap from other opera-
tions, such as old drill pipe or casing for the deadmen, and worn-out sucker
rods to connect the deadmen with the guy wires. Also, the shop facilities
are different for different companies. Therefore, what might be the cheapest
system for one company might not be the cheapest for another.
Mr. Tough shows a sketch of an improved system of guying der-
ricks which is in common use at present. The three guy wires from
each derrick leg are anchored to a concrete deadman 5 feet below
the ground surface and 100 feet from the derrick corner. Each of
the three guy wires is attached to the upper end of a seven-eighths-
inch eyebolt by means of a three-fold eye clamp, thimble, and turn-
buckle. Each eyebolt is protected from rust by a piece of 14-inch
pipe that extends from the deadman to the threads on the upper end
of the eyebolt, at a point above the surface of the ground. The
space between the eyebolt and the inside of the pipe is filled with
asphalt. The lower end of each of the three eyebolts is bent around
the middle of a piece of 6-inch casing 6 feet long. This casing is
embedded in the middle of a block of concrete 6 feet 4 inches long,
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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/m1/135/: accessed June 28, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.