align the three bolt holes at the top of the rails with
similar holes in the side of the dome. Insert 1/2-by 1
Ml-inch bolts through the rails and the dome, in that
order. Apply gaskets and washers to the bolts (fig. 9-16,
#6). Make sure that the cup side of the washers is
facing down over the gaskets. Apply the nuts to the
bolts. Make sure that the rounded face of the nut is
bearing against the washer. Tighten the bolts. Install a
28 bolt hole gasket (fig. 9-17, #1) on the inside face of
the bottom flange of the dome. Insert 1/2- by 1 1/4-inch
bolts through the flange and the gasket. The gasket
will hold the bolts in place.
Install the ladder anchors (fig. 9-16, #8) at the
bottom of the rails. Place the long leg of the anchor
over the three bolt holes in the vertical leg of the rails.
The short leg of the anchor faces outward. Adjust the
outside bolting face of the short leg so it measures 9
feet 5 15/16 inches from the top flange of the dome.
Insert two bolts through each anchor and rail. Apply
the nuts to the bolts and tighten securely.
Figure 9-18.Center support ladder installed.
Figure 9-19.Deck plates ready for installation.
Line up two diametrically opposite lap seams (fig
9-18) in the tank bottom. Remove a nut from each bolt
in the lap seams and the first bolt to the right and left
of each lap seam. Raise the ladder assembly and se the
anchors over the bolts. Apply the nuts and tighten
Top Deck Assembly
The assembled deck consists of 14 tapered, flat
steel plates (fig. 9-19) with an integral formed flange
along the right lap seam. The seams are identified rig
and left, facing the large end All of the plates are
Of the 14 plates, three are special. Two plates a
fitted with a tank thief and vent, and one plate is fitted
with a liquid level indicator. Each deck plate has deck
plate channel and a rafter bolt retainer angle
assembled on it. The small end of the plates is bolted to
the bottom flange of the dome. The large end bolted to
the top chime of the staves.
LAYOUT AND ASSEMBLY OF PLATES. Lay
out the plates around the outer perimeter of the tank
foundation. Place the blocking on the ground, spaced to
fit inside the confines of the plate. Lay the inside of the
flange with the short leg facing outward. Insert four
equally spaced bolts through the angle and flange.
Apply the nuts to the bolts. Tighten the bolts. Turn the
plate over with the flange down. Install a gasket along
the full length of the right lap seam. Allow a two bolt
hole overlap at each end.
LAYOUT OF ASSEMBLED PLATES. As the
plates are assembled, raise them up and stand them