Hoisting, Chapter 15 hoisting, Hoist instructions – Grain Systems Tanks PNEG-1070 User Manual

Page 75

PNEG-1070 15', 18', 21', 24', 27' and 30' CHT’s

15. Hoisting

Hoist Instructions

Recommendations for hoisting completed tank onto hopper bottom structure.

(All parts mentioned in this section are not furnished.)

A crane is normally used to lift the tank and place it on top of the substructure. Technique of hoisting of
the complete tank on the hopper structure is in large part based on personal experience, equipment and
manpower. The following recommendations are intended as a guideline only.

1. Before lifting the tank, the following should be checked:

a. The columns and substructure should be checked for levelness and verified plumb and leveled

if necessary.

b. Final ladder and safety cage and door locations should be determined and clearance at these

locations verified.

c. Proper provisions should be made for safe working platforms around the top of the substructure.

2. Lifting techniques are largely influenced by personal experience and equipment capacity, however

general recommendations as follows:

a. Lifting brackets should be attached to the stiffeners. At least one bracket per sidewall sheet

should be used. These are usually attached in the third ring from the bottom of the tank. Brackets
should attach to a minimum of four (4) bolts through the stiffener. Attach cables to the lift brackets
and to the crane hook, which has been lowered through the center ring opening. Cables should
be sized to handle the entire weight of the bin. Make all lift cables of equal length before the bin
is lifted. Refer to

Figure 15A

and

Figure 15B on Page 76

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 is 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 will bolt to the lifting brackets
attached to the stiffeners. (Refer to

Figure 15C on Page 76

.) Typical number of horizontal

members that should be used are shown in the chart below.

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

Diameter

# of Brackets

12'

15'

18'

21'

24'

27'

30'

Recommended Number

of Horizontal Brackets

Diameter

# of Braces

21'

27'

12'

24'

15'

30'