Insert the channel assembly through the center bottom
plate and gasket.
NOTE: To prevent damage to the gasket, do not
use a sharp-edged tool or pipe to force the gasket over
the bolts. Use a well-rounded, smooth, mouth tool.
Lay the center bottom plate on the bolt-retaining
boards. These boards will prevent movement of the
bolts when the bottom plates are installed.
The tank bottom consists of 14 tapered, flat steel
plates. Thirteen plates are plain, and one is soecial. All
of the plates are interchangeable. When the bottom is
completely installed, the plate pattern resembles a
wheel. The first bottom plate (fig. 9-7, #7) has a bolt
channel placed under each radial lap seam with l/2-
by 1 l/4-inch bolts (fig. 9-8). A strip gasket is placed
along each seam. The seams are identified as right and
left, facing the large end.
Starting at the large end of the plate (fig. 9-7),
place a bolt channel under the right and left lap seams
of the plate. Insert the bolts through all except the end
bolt holes in the plate and channel. As the channels are
put in place, position the bolt-retaining boards to
facilitate installation of the gaskets. Install the gasket
along the full length of the right and left lap seams.
Allow a l/2-inch bolt hole overlap at each end.
NOTE: When there is a break in the gasket
material, the ends should overlap two bolt holes and
be cut squarely across the second hole. Putty must be
Figure 9-8.Installation of bottom plates.
applied to each end of the overlap strip to ensure a
Upon the completion of the assembly, move this
plate to the approximate installation position on the
Of the 13 intermediate plates, one is an outlet
plate, which is assembled with channels and strip
gaskets. The channels are placed under the right lap
seams. Follow the same assembly procedures as
outlined above. In addition, the outlet plate has a blind
flange set assembled on it. The above procedure does
not apply to the last bottom plate as no further
assemblies are made on it. Keep the last bottom plate
separated from all of the other plates until it is installed
in the tank bottom.
Cut six one-hole gaskets from the strip gasket
material (fig. 9-8, #2). Force a one-hole gasket over
and against the head of each flange bolt. Insert the
bolts through the bolt holes in the inside flange half
from the outside face of the flange with the heads of
the bolts fitting into the cutouts provided. Lay
bolt-retaining boards on the ground. Position the
flange assembly with the bolt head resting on the
boards. Slip a gasket over the bolts and force it down
against the inside face of flange #7, using a round
smooth, mouth tool. Work from the ground face of the
plate (fig. 9-7, #7) and push the bolts through the bolt
holes of the flanged opening. Place blocking under the
bolt and flange assembly to hold it in position. Slip a
gasket over the bolts and force it down against the
inside face of the plate. Slip the outside flange half
over the bolts with the machined face of the flange
facing the gasket. Apply the nuts to the bolts. lighten
the bolts. Remove the plate from the blocking and lay
it on the tank foundation
With the first bottom plate in the approximate
installation location on the tank foundation, lay the
remaining plates around the tank foundation. Proceed
with the installation as follows.
FIRST PLATE. Place the small end of the plate
over the center plate bolts (fig. 9-8, #3). Apply
finger-tightened catch nuts to the bolts inside the lap
seams. Catch nuts are ordinary nuts applied to the bolts
to hold the assembled plates in position.
F I R S T I N T E R M E D I A T E P L A T E .
Wedge-shaped gaskets must be used wherever three
plates are joined together. Before installation of the
plate, you should place a wedge gasket (fig. 9-8, #4)
over the gasket (fig. 9-7, #3) at the right edge of the
first plate #7. Face the small end of the plates. Install