STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

Derricks and Portable Masts 519
All guy line anchors should have a minimum breaking or pull-out strength
at least equal to two times the maximum total calculated anchor load in
the direction of the resultant load, and in the absence of manufacturer's
recommendations, values in Table 4-3 are recommended.
Representative pull tests for the area, size, and type of anchor involved and
made by recognized testing methods should be made and recorded. Records
should be maintained by the installer for temporary anchors and by the
lease owner for permanent anchors. Permanent anchors should be visually
inspected prior to use. If damage or deterioration is apparent, the anchor
should be tested.
Metal components of anchors should be galvanized or otherwise protected
against corrosion. Sucker rods should not be used in anchor construction.
Anchor location should be marked with a stake if projections aboveground
are subject to bending or other abuse.
Anchor location should avoid old pit or other disturbed areas.
Mast Foundation for Portable Masts with Guy Lines
Foundations must consider ground conditions, location preparation, and
supplemental footing as required to provide a stable base for mast erection and
to support the mast during the most extreme loading encountered. A recommended
location preparation to provide ground conditions for safe operations
is shown in Figure 4-6.
Supplemental Footing
Supplemental footing must be provided to distribute the concentrated loads
from the mast and mast mount to the ground. The manufacturer's load distribution
diagram indicates the magnitude and location of these concentrated loads.
If the manufacturer's load distribution diagram is not available, supplemental
footing should be provided to carry the maximum hook load encountered, plus
the gross weight of mast and mast mount weight during mast erection. The area
Table 4-3
Recommended Guyline Anchor Spacing and Loads
See Par. C. 16a and Figure C.l [3]
1 2 3 4 5 6 7
Doublca Mast Singles Mast Pole Mast
Mini m u m .
Spacing Anchor Anchor Anchor
X or Y Test Angle Test Angle Test Angle
Dimeniion Anchor from Horir. Anchor from Horiz. Anchor from Horir.
See Fig. A.1. Test had, to Well Test Load, to Well Test Load, to Well
feet ton8 Center Line tons Center Line tons Center Line
20
N.A. N.A. 3.7 70'
7.0 67'
25 15.6 71'
- -
- -
30 13.7 67O 3.1 609 - -
40 11.0 600 2.8 530 4.0 49'
60 8.4 499 2.7 45- 35
45-
70 7.8 450 2.7 450 - -
80
7.4 45' 2.7 450 3.0 450
w 7.0 450 2.7 450
-
50 9.3 540 27 45. - -
NOTE: Prefemd. X pnater than Y. Limita, Y nawt not
emeed I.2SXand Z mmt be eplial to bz leas than
1.SX bid notlrm than Y. (Fig. C.1)
CAUTION THE ADDITION OP WINDSCREENS
OR THE RACKING OF PIPE ABOVE
GROUND LEVEL CAN SICNIFI-
CANTLY INCREASE THE ABOVE