Grain Systems Tanks PNEG-4021 - Manual (Page 87)

12. Support Ring Instructions
PNEG-4021 40 Series 18', 21' and 24' Diameter Bins 87
Roof Support Ring Instructions
Roof support rings are standard on all bins up to 48' diameter. Two (2) support rings are standard for
18'-24' 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. (T=Top, B=Bottom)
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.
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
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