Use the temporary ladder while you are installing the
Place the assembled ladder where it is convenient
to thief and vent at the outer perimeter of the deck.
Lift the ladder and set the end bolt holes of the braces
(fig. 9-21, #7 and #8) over the bolts in the bottom chime
of the staves. Mark the bolts. From the top of the
temporary ladder, mark the bolts in the outer
perimeter of the deck covered by rails. Set the outside
Figure 9-22.One-piece flanged elbow installed
on the inside of the tank.
ladder aside. Remove the nuts from the bolts. Set the
outside ladder back over the bolts. Install the nuts on
the bolts. lighten the bolts. Tighten the bolts by
attaching the braces to the bottom of the ladder.
Remove and disassemble the temporary ladder.
Water Drawoff Valve
The valve assembly consists of a commercial 2-inch
bronze valve made up in a cast-iron flange with a
gasket installed outside the tank. A one-piece, flanged
cast steel elbow with a gasket is installed inside the
tank. The valve and elbow bolt together through the
side of the tank
FLANGED ELBOW. Install the elbow (fig. 9-
22, #1) inside the tank on the stave. Cut four one-hole
gaskets. Force the gaskets over the bolts. Insert the
bolts through the flange of the elbow. Place the
blocking under the heads of the bolts. Force a gasket
over the bolts. Turn the inlet of the elbow toward the
tank bottom. Insert the bolts through the stave. Install
the nuts temporarily on two bolts while you are
assembling the valve. Remove the nuts before
installation of the valve.
DRAWOFF VALVE. Hold the elbow (fig. 9-22,
#1) in position inside the tank. Install a gasket (fig. 9-
23, #1) over the bolts. Install the outside flange over
the bolts. Install the nuts on the bolts. Tighten the
bolts. Install the made-up valve inside the flange. With
Figure 9-23.Water drawoff valve installed on the outside of the tank.