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STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

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Nominal<br />

Base Square<br />

Two I" or l-l/4" bolts at<br />

each corner<br />

1-3/8" holes in base plate<br />

Derricks and Portable Masts 505<br />

TO" 2 118" rC-<br />

80- .87-, 94-, 122-, and 136-ft. Derricks<br />

Nominal<br />

Base Square<br />

Four 1-12'' bolts at<br />

each corner<br />

1-3/4"holes in base plate<br />

140 -ft. and 147-ft. Derricks<br />

Nominal :<br />

Base Square<br />

Four 2'' bolts at<br />

each corner<br />

2-3/8"Holes in base<br />

plate<br />

15": 1/8"<br />

* 4"-,<br />

189 -ft Derrick<br />

Figure 4-3. Foundation bolt pattern for derrick leg [2].

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