Grain Systems Tanks PNEG-1092 - Manual (Page 69)

11. Roof Truss Details
PNEG-1092 30° Bin Roof Construction 69
CRP-5286 (39'-48' (11.89 m-14.63 m) Support System)
CRP-5421 (54'-60' (16.46 m-18.29 m) Support System)
1. All packages (39'-60' (11.89-18.29 m)) shall span three (3) roof panel as shown in Figure 11E
on Page 70 .
2. One package should be provided for each cable in the tank with the exception of the center cable.
3. The 39'-48' package includes bracing angle for the roof rafters, hanging angle and a cable support
channel. The 54'-60' package includes the hanging angle and cable support channel.
4. Each set of rafters should carry only one temperature cable.
5. Once the commercial roof system has been installed, installation of the cable support packages may
proceed as follows.
6. For 39'-48' bins, center the support angle and drill the holes to bolt the support angle (CRP-5185
(39' and 48') (11.89 m and 14.63 m)) into the roof rafter ( See Figure 11F on Page 70 (39' and 48')
(11.89 m and 14.63 m) to locate which holes to drill.) and attach with 3/8" diameter bolts. Support
angles may be installed on the outer surface as indicated in
Figure 11F on Page 70 . 54'-60' Diameter
bins do not use support angle.
7. Should the angle location be such that the rafter splices coincide with angle placement, the angle
(CRP-5185) should be slid one way enough to align the angle holes with the splice bolts or miss the
splice bolts.
8. Slight adjustments of the radius may be necessary to ensure that the channel support angle holes
and cable support channel holes will correspond. Field drill the holes in the roof rafter for the hanging
of the channel, as illustrated in
Figure 11G on Page 71 .
9. Once the rafters are in place, field drill the holes to bolt the support angle CRP-5786 or CRP-5787
into the roof rafter (See Figure 11G on Page 71) and fasten with 3/8" bolt.
10. Attach the cable attachment bracket (CRP-5213) in the center of the support channel (CRP-5285) as
illustrated in Figure 11G on Page 71 and hang the cable.
11. If it is desired to support the cable from the flange of the support channel (CRP-5285), it will be
necessary to reinforce the flange with a 12" section of 3" x 3" x 3/16" angle.
12. No more than one cable should be supported from a pair of roof rafters.
13. This package will allow a maximum radius of: (39' and 42' equals 16.86') (12.80 m equals 5.14 m),
(48' equals 19.22') (14.63 m equals 5.86 m), (60' equals 23.97') (18.29 m equals 7.31 m). These radii
represent the maximum radius that the cross members will span. These are not recommended
installation locations. Install according to the temperature cable manufacturer’s recommendations.
For a greater radius, the recommendation shown in this manual for temperature cable installation
must be used (using field cut, hot rolled sections), however a rafter support package must be used.