Grain Systems Tanks PNEG-4135 - Manual (Page 86)

Chapter 7: Roof Assembly
Table 7-1 A-frame installation sequence and temperature cable locations for 135 ft diameter bin (cont'd.)
A-frame number Rafter Number Temp Cable Number Radius Location
A21
R30 T14 32.2 ft
R31 — —
A22
R9 T7 32.2 ft
R10 T2 12.3 ft
R11 T23 55.4 ft
NOTE: A-frames labeled “A1” through “A9” have X-bracing and are installed first. A-frames labeled “A10”
through “A22” are standard A-frames, and A-frames “A22” is a triple rafter assembly that will be the
final lift. The empty spaces that are not labeled must have purlins installed between the rafters
after all the A-frames are secured. The numbers reflect the recommended installation sequence of
the A-frame assemblies.
Table 7-2 Starting lengths for temperature cables for 135 ft diameter bins
Length from the center collar None
Length from 12.3 ft diameter location 318.8 in. (809.75 cm)
Length from 32.2 ft diameter location 239.4 in. (608.08 cm)
Length from 55.4 ft diameter location 67.9 in. (172.47 cm)
The temperature cable lengths in the chart above are the distances from where the temperature cable
attaches to the rafter or the center collar to the top ring. To calculate the correct temperature cable length,
add 32 inches for each bin ring to the starting length. Temperature cables must terminate above any
unload equipment and be secured in place with twine. DO NOT allow cables to become tangled in unload
equipment.
Assembling the Temperature Cable Bracket
The temperature cable brackets are installed to the roof rafters and support the temperature cables.
Before You Begin
Determine the correct location of the temperature cable brackets within the structure of the A-frame
Assembly. See
About Temperature Cable Brackets and A-Frame Assemblies, page 83 .
What You Should Know
The A-frame assembly consists of two roof rafters, purlin clips, purlins and possibly X-bracing. The temper-
ature cable brackets should be installed when the A-frames are assembled.
NOTE: The temperature cable bracket must be installed at specific locations, see About Temperature
Cable Brackets and A-Frame Assemblies, page 83 .
1. Attach a right purlin clip (C), a left purlin clip (D) and a temperature cable bracket (B) to the roof rafter
(A), and install three flange bolts (E) and three flange nuts (F).
NOTE: If no X-bracing is installed, install four flange bolts (E) and four flange nuts (F).
2. After all purlins and X-bracing are installed in the A-frame, tighten all hardware to the recommended
torque specifications. See Bolt Torque Specifications, page 26 .
86 Pneg-4135 135 Ft Diameter 40-Series Bin