Grain Systems Tanks PNEG-4078 - Manual (Page 83)

Chapter 7: Roof Assembly
Assembling Purlin Number 4
Purlin number 4 is located at the top of the roof rafters nearest to the center collar rafter clips.
Before You Begin
Place two roof rafters on the ground with roof panel holes facing up.
NOTE: Temperature cables may also be installed at this location, to determine if temperature cable brack-
ets will be needed, see About Temperature Cable Brackets and A-Frame Assemblies, page 75 .
What You Should Know
The A-frame roof rafter section consists of two roof rafters identified as the left-hand roof rafter (A) and the
right-hand roof rafter (C).
There are also two different purlin clips, a left purlin clip (E) and a right purlin clip (D). The left purlin clip
has an extra hole located in the center as compared to the right, which only has six holes where the purlin
and purlin clip are bolted together.
NOTE: The seventh hole location in the center of the left purlin clip (E) is for identification purposes only.
No hardware is used in this location.
1. Attach a left purlin clip (E) and a right purlin clip (D) to the right-hand roof rafter (C), and install three
flange bolts (F) and three flange nuts (I).
2. Attach a left purlin clip (E) and a right purlin clip (D) to the left-hand roof rafter (A), and install three
flange bolts (F) and three flange nuts (I).
3. Install the purlin (H) to the right purlin clip (D) and the left purlin clip (E) located between the left-hand
roof rafter (A) and the right-hand roof rafter (C).
NOTE: Ensure that the orientation of the purlin is correct, the roof panel holes are facing up, and the
notch in the purlin is facing the right-hand roof rafter (C).
4. Install twelve flange bolts (B) and twelve flange nuts (G), securing the purlin to the purlin clips.
5. After all purlins are installed in the A-frame, tighten hardware to the recommended torque specifica-
tions. See Bolt Torque Specifications, page 24 .
Pneg-4078 78 Ft Diameter 40-Series Bin 83