GSi BFT 12, Assembly Manual, Page: 39 / 88

Bulk Feed Tanks
39
PNEG­257 12'­21' BFT
Ro of
After completing first ring assembly, you are ready to begin roof
construction. First, build a roof center support to hold the peak
ring in place at the proper height. A simple structure consisting
of a sturdy cross arm attached to a pole and supported by a plat­
form or scaffolding will do. Stand the center support directly in
the center of the tank. The bottom of the peak ring should be
89.5/16" (2269 mm) above the foundation on the 18' tank and
78.15/16" (2005 mm) above it on the 15' tank. These dimensions
are approximate ones used in BFT construction. Adjusting the
center support height will ease roof erection. Refer to the accom­
panying drawings for details. Install 6 roof reinforcement angles
spaced equally around the tank. Reinforcement angle edges are
parallel with sidewall sheet and peak ring, see views "A­A" and
"D­D".
The reinforcement angles utilize every other hole in the the
peak ring. At the sidewall, there are 12 spaces between each
reinforcement angle on the 18' tank and 10 spaces between
each on the 15' tank. Next, "skin" the roof by installing the
roof panels on the just completed reinforcement structure.
Reinforcement angles will share all roof panels holes, including
hole where panel and peak ring attach. Insure that all roof
seams are caulked and lapped correctly as shown in the accom­
panying detail drawings.
Sidewall Sheet
Roof Compression Straps
Roof Reinforcement Angle
15' and 18' Roof Assembly Instructions