Grain-systems Tanks PNEG-4075G User Manual download pdf (Page 82)

Chapter 7: Roof Assembly

The A-frame assembly consists of two roof rafters identified as the left-hand roof rafter (A) and the right-

hand roof rafter (C). The purlin configuration may not be the same on all A-frames at this location, (number

5), depending if X-bracing is being installed or not.

There are also four different purlin clips, an upper and lower left purlin clip (E and J) and an upper and

lower right purlin clip (D and K). The left purlin clips have seven holes, compared to the right, which have

six holes along the purlin and purlin clip mating surface.

NOTE: The seventh hole located in the center of the left purlin clips (E and J) is for identification purposes

only. No hardware is used in this location.

1. Attach an upper left purlin clip (E) and an upper right purlin clip (D) to the right-hand roof rafter (C),

and install three flange bolts (F) and three flange nuts (I).

2. Attach an upper left purlin clip (E) and an upper right purlin clip (D) to the left-hand roof rafter (A), and

install three flange bolts (F) and three flange nuts (I).

3. Position the purlin (H) to the upper right purlin clip (D) and the upper left purlin clip (E) located

between each roof rafter.

4. Attach a lower left purlin clip (J) and a lower right purlin clip (K) to the purlin and install twelve flange

bolts (B) and twelve flange nuts (G), securing the purlin to the purlin clips.

NOTE: If no X-bracing is being installed, proceed to step 7.

5. Attach the bottom X-brace (M) to the lower right purlin clip (K) and 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.

6. Attach the top X-brace (L) to the lower left purlin clip (J) and the left-hand roof rafter (A), and install a

flange bolt (F) and one flange nut (I) into the top hole.

NOTE: The bottom portion of the X-braces will be secured to the upper purlin clips in the next purlin

assembly. The X-braces will be secured together only after the bottom portion of each X-

braces are secured. See Assembling Purlin Number 4, page 84

7. After all purlins are installed, tighten the hardware to the recommended torque specifications. See

Bolt Torque Specifications, page 24.

82 Pneg-4075G 75 Ft Diameter 40-Series Bin

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Grain-systems Tanks PNEG-4075G User Manual Page 82