Grain Systems PNEG-707GSI - Manual (Page 38)

4. Orientation Wall Sheets and Vertical Channels
38 PNEG-707 12', 18', 24' and 30' GSI Commercial Tower Dryer
Wall Sheet Guidelines
Inside wall sheets (and hardware) are galvanized, and form plenum chamber wall of dryer.
Outside wall sheets (and hardware) are stainless steel, and form tower wall of dryer.
These two (2) walls of the dryer are separated by columns of vertical channels. This structure forms grain
columns through which grain flows.
Each perforated wall sheet has a rough side and a smooth side. Install wall sheets so the rough side is
away from grain column. This reduces grain sticking to wall sheets and allows grain to flow freely down
grain column. (
See Figure 4P on Page 36 , wall sheets overlap.)
Install wall sheets to vertical channels so wall sheets overlap as explained in Figure 4P on Page 36 .
Plan ahead and leave out a vertical channel and some wall sheets where necessary to bring burner,
reducer, and blowers into dryer. (Install rolled plenum channels temporarily as required to maintain
shape and stability.)
Bolts: In each section of dryer, loosely install all bolts to wall sheets and common bolts through rolled
plenum channels reinforcing wall sheets before tightening bolts in that section of dryer.
Insert bolts so that bolt head is in the grain column. This reduces collection of fines (fine debris from
grain), and allows grain to flow freely.
(See Figure 4P on Page 36.)
Do not fill bottom bolt holes in ring of wall sheets. Install next ring of wall sheets with common bolts in
bottom bolt holes in previous wall sheets.
Leave out some bolts for lifting brackets.
On vertical wall sheet seams, (plumb, up and down), use 5/16" x 1" hex head bolts and nuts.
On horizontal wall sheet seams, (level, left and right), use 5/16" x 3/4" hex head bolts and nuts.
Use washers where there is a possibility of leaking.
To tighten bolts, work around the ring of wall sheets, tightening horizontal seams, then vertical seams.
To avoid wrinkling wall sheets when tightening bolts, work in pairs. One (1) person (standing in grain
column) holds alignment punches in top and bottom holes of wall sheets to align them to vertical channel
holes. Second person (standing outside grain column) tightens each nut with impact wrench. Drill out
misaligned stainless steel wall sheets. While one (1) worker is tightening horizontal bolts on outside
sheets, second worker (inside grain column) presses outside sheets outward.
When installing wall sheets, install support clips to them for parts such as catwalks, platforms, bracing, etc.
Rolled Plenum Channels
Rolled plenum channels are spliced with plenum channel splices, and installed in rings to inside wall
sheets. Install 20" apart, and down length of dryer. If necessary to clear another part, shift a rolled plenum
channel ring up or down 5" (10" maximum).
Splice to rolled plenum channel, use 5/16" x 1" whiz bolts. Rolled plenum channel to wall sheet, use
5/16" x 3/4" whiz bolts.