STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

Derricks and Portable Masts 503
c
I
A
A The vartical distance from the top of the base plate to
the bottom of the crown block sumport beam.
I Tha distance betwaan hael to heel of adidcant lags et the
top of the base plate.
C - The window opaninq measured In the clear and parallel to
tha center line of the derrick ride from top of base plate.
D - The sm+st clear dimension at the top of the derrick
that would restrict passage of crown block.
E - The eiaarence between the horixontal header of the pin
poi. and the top of tha crown support beam.
Derrick Window
Flgure 4-1. Derrick dimensions [2].
The derrick window arrangement types A, C. D, and E, shown in Figure 4-2,
shall be interchangeable. The sizes and general dimensions of the V window
opening and drawworks window opening are given in Tables 4-1 and 4-2.
Foundation Bolt Settings
Foundation bolt sizes and patterns are shown in Figure 4-3. Minimum bolt
sizes are used and should be increased if stresses dictate larger diameter. The
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