Grain Systems Tanks PNEG-1092 - Manual (Page 37)

8. Support Ring Instructions
PNEG-1092 30° Bin Roof Construction 37
Roof Support Ring Instructions 30° Roof
Roof support rings are standard on all bins up to 48' diameter. A single support ring is standard for
15' diameter bins. Two (2) support rings are standard for 18'-48' diameter bins. All support rings will be
placed on the outside of the roof panels.
To determine the location of the support rings, start at the narrow or peak of the roof panel and count
each hole. Having counted down the required distance, as described in the
Chart below , install the
appropriate brackets.
Expansion bolts should be fully contracted when assembling support rings. When you have completely
assembled both rings, (but prior to expanding the bolts) tighten all roof bolts including eave clip bolts.
Now extend expansion bolts by running the nut out on the threads. This procedure should be continued
evenly around the roof until the ring raises the roof to show a slight crown.
Support ring expansion bolts may become dislodged from the ring during high winds or when the inside
pressure of the bin is too great. If one expansion bolt is dislodged, the entire ring will become useless.
To prevent this, drill holes through the support ring and expansion bolt (after the rings have been installed
and expanded to the correct size) and insert a cotter pin or bolt through each hole.
NOTE: Welding of the expansion nuts to the pipe and expansion bolts or staking the expansion bolt
threads to prevent the movement of the jamb nut may be done as an option to drilling and pinning.
See Page 39 for support ring placement on 42' and larger commercial roofs.
NOTE: Last support ring pipe must be cut to length.
Bin Diameter
Support Ring Location
Support Ring Location
from Center
Support Ring
Color Code
Number of Pipes
per Ring
15 (T) 3 rd Hole Yellow/White 3
18 (T) 3 rd Hole Yellow/White 3
18 (B) 4 th Hole Blue/White 4
21 (T) 3 rd Hole Yellow/White 3
21 (B) 5 th Hole Red/White 5
24 (T) 3 rd Hole Yellow/White 3
24 (B) 5 th Hole Red/White 5
27 (T) 5 th Hole Blue/White 4
27 (B) 7 th Hole Ochre 6
30 (T) 5 th Hole Blue/White 4
30 (B) 8 th Hole Light Blue 7
33 (T) 3 rd Hole Blue/White 4
33 (B) 7 th Hole Gold 8
36 (T) 3 rd Hole Blue/White 4
36 (B) 7 th Hole Gold 8
39 (T) 7 th Hole Brown/Yellow 8
39 (B) 10 th Hole Gold/Red 11
42 (T) 7 th Hole Fluorescent Green/Brown 8
42 (B) 10 th Hole Fluorescent Green/Gold 11
48 (T) 7 th Hole Fluorescent Green/Brown 8
48 (B) 11 th Hole Fluorescent Green/Pink 12