the plate and all of the remaining plates to the left of the
first plate or in a counterclockwise direction around the
tank foundation. Place the small end of the plate over
the bolts (fig. 9-8, #3) with the right lap seam of the plate
laid over the bolts (fig. 9-8, #1) in the left lap seam of the
plate (fig. 9-7, #7).
Apply finger-tightened catch nuts to the bolts.
Follow the same procedure as outlined above. Apply
catch nuts to the bolts in the lap seam at intervals of
approximately 18 inches.
Do not tighten the catch nuts beyond finger
tightness. Each plate must move in the adjustment of
the tank bottom to obtain the correct spacing for the
installation of the last plate.
REMAINING INTERMEDIATE PLATES. The
remaining intermediate plates are installed following the
same procedure as above.
LAST PLATE. InstaIl the last plate by spacing
the lap seams over the lap seams of the next-to-last plate
(fig. 9-9, #1) and the first plate (fig. 9-9, #2). Place the
small end over the bolts (fig. 9-8, #3). Ibis is a vital point
in the tank bottom; make sure it is secure against
INSTALLATION OF WEDGE GASKETS.
Apply a heavy coating of sealing compound to both faces
of the two gaskets (fig. 9-9, #3), and install them over the
bolts (fig. 9-9, #4). Use a generous amount of sealing
compound at the overlap to seal The opening under the
TIGHTENING TANK BOTTOM. Work from the
small end of the plates and remove all of the catch nuts.
Install a rubber gasket, a steel recessed washer, and a
nut on each of the bolts. This applies to all of the bolts in
the tank bottom with the exception of those in the outer
circumference (chime) of the tank bottom,
Figure 9-9.Method of installing the wedge
gaskets at the installation of the last bottom plate
Figure 9-10.Applytng sealing compound to the
bottom chimes of the staves.
which secures the side staves. Tighten all of the bolts in
the tank bottom, starting at the small end of the plates.
SEALING SEAMS. Sweep the bottom clean after
tightening the bolts. With the bottom dry, apply a
sealing compound to all of the bottom seams (fig. 9-l0).
This is a single ring tank Place all of the center
support ladder components and the manhole dome on
the bottom just before installing the last stave. This is to
prevent them from having to be lifted over the top of the
staves later. The top and the bottom flanged edges of the
staves are called chimes, and the side edges are called
vertical seams. The staves have a single row of bolt holes
in each seam.
LAYOUT OF STAVES. There are five special
and nine plain staves in the ring. Place the staves with
the opening and pipeline connections in the proper
position, then lay out the remaining staves around the
perimeter of the bottom. Place the staves with the
chimes side down for convenience in preparing them for
assembly. The staves are laid out so each straddles a
radial seam of the bottom.
Staves have an offset at the top and the bottom. The
top is determined by looking at the stave in a