Grain Systems Tanks PNEG-1092 - Manual (Page 73)

11. Roof Truss Details
PNEG-1092 30° Bin Roof Construction 73
Temperature Cable Support Packages for Eave Heights of
40'-5'' or Less (12.32 m) Installation
CRP-5423 (27'-33' (8.23 m-10.06 m) Support System) and
CRP-5424 (36'-42' (10.97 m-12.80 m) Support System)
1. All 27' through 42' (8.23 m-12.80 m) packages shall span one roof panel as shown in Figure 11I
on Page 74 .
2. A rafter support system (included in each package) will be necessary for temperature cable
installation in farm tanks 27' (8.23 m) to 42' (12.80 m) in diameters that have an eave height less than
40'-4" (12.29 m).
3. One package should be provided for each cable in the tank with the exception of the center cable.
4. All packages include hanging angles and a cable support channel.
5. Each set of rafters should carry only one temperature cable.
6. Kit CRP-5424 contains two (2) rafter sections which splice together with CRP-5262. Kit CRP-5423
contains only one rafter section.
7. (CRP-5424 ONLY) Center the support angle on the outside of the rafter and field drill the holes to
bolt the support angle (CRP-5422) (36'-42' (10.97 m-12.80 m)) to the roof rafter ( See Figure 11J on
Page 75 to locate which holes to drill) and attach with 3/8" diameter bolts.
8. (CRP-5424 ONLY) Should the angle location be such that the rafter splice coincides with angle
placement, the angle should be slid one way enough to align the angle holes with the splice
bolts or miss the splice bolts. (If angle is to be bolted over splice, remove splice plate before
installing angle.)
9. Once the rafters are in place, field drill the holes to bolt the support angles (CRP-5786 or
CRP-5787) into the roof rafter (See Figure 11I on Page 74) and attach with 3/8" diameter bolts.
10. Attach the cable attachment bracket (CRP-5213) in the center of the support channel (CRP-5419) as
illustrated in Figure 11I on Page 74 and hang the cable.
11. If it is desired to support the cable from the flange of the support channel (CRP-5419), 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: (27' equals 11.84') (8.23 m equals 3.61 m), (30' equals
13.15') (9.14 m equals 4.01 m), (33' equals 14.00') (10.06 m equals 4.27 m), (36' equals 15.29')
(10.97 m equals 4.66 m), (42' equals 17.84') (12.80 m equals 5.44 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 still be used.