Use the temporary ladder while you are installing the outside ladder.

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.