Grain Systems Tanks PNEG-603 - Manual (Page 52)

16. Hoisting
52 PNEG-603 4" Commercial Hopper Tank
Hoisting Recommendations (Continued)
b. To prevent distortion of the assembled tank a “spider” or horizontal bracing is recommended.
A suggested method of this is illustrated in the following details. This may be done by using a
center “hub” and pipe. The center hub would typically be made of 6" schedule 40 pipe with
3" x 3" x 3/8" angle welded to it and the pipe bolting to the hub. The second smaller pipe would
bolt to the lifting brackets attached to the stiffeners.
(See Figure 16C.) Typical number of
horizontal members that should be used are listed in the below chart.
c. Use of temporary bracing across the peak collar may be needed to guide the cable. This should
be made easily removable.
Recommended Minimum Number of Lift Brackets
Figure 16C
Diameter # of Brackets
18' 6
21' 7
24' 8