Assembling purlin number 4 – Grain Systems Tanks PNEG-4090A User Manual
Page 89
Assembling Purlin Number 4
Purlin number 4 is located forth purlin from the eave.
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 77
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 seven holes, compared to the right, which has six holes along the purlin and purlin clip mating surface.
IMPORTANT: Do not drill additional holes in purlin. Install the flange bolts and the flange nuts as dictated
by the number of holes in the purlin.
NOTE: The seventh hole located in the center of the left purlin clip (E) is for identification purposes only.
No hardware is used in this location.
1. Attach a right purlin clip (D) and a left purlin clip (E) to the right-hand roof rafter (C), and install two
flange bolts (F) and two flange nuts (I) into the two top holes.
NOTE: If no X-bracing is being installed, install three flange bolts (F) and three flange nuts (I) in this
step.
2. Attach a right purlin clip (D) and a left purlin clip (E) to the left-hand roof rafter (A), and install two
flange bolts (F) and two flange nuts (I) into the two bottom holes.
NOTE: If no X-bracing is being installed, install three flange bolts (F) and three flange nuts (I) in this
step.
3. Install the purlin (H) to the right purlin clip (D) and the left purlin clip (E) located between each roof
rafter. Install eight flange bolts (B) and eight flange nuts (G), securing the purlin to the purlin clips.
NOTE: If no X-bracing is being installed, proceed to step 8.
4. Attach the bottom X-brace (K) to the right-hand roof rafter (C), and install a flange bolt (F) and a
flange nut (I) into the bottom hole.
IMPORTANT: For adjustment purposes, DO NOT tighten the X-brace flange bolts until all X-braces
have been installed.
5. Attach the top X-brace (J) to the left-hand roof rafter (A), and install a flange bolt (F) and one flange
nut (I) into the top hole.
6. Secure the bottom portion of each X-brace (J and K) with a flange bolt (F) and one flange nut (I).
7. Install a flange bolt (L) and one flange nut (M) securing the X-braces together where they cross.
8. After all purlins are installed, tighten the hardware to the recommended torque specifications. See
Bolt Torque Specifications, page 24
Pneg-4090A 90 Ft Diameter 40-Series Bin
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