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. 922, #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. 923, #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.

the threads tight, the valve outlet must be facing the ground.

Tank Outlets

The outlet assembly consists of an elbow, fabricated, made up with a flange, inside, cast iron, and a gasket installed inside the tank An adapter, fabricated, steel pipe, made up with a flange, outside, cast iron, and a gasket are installed outside the tank The outlet end of the adapter is sealed with a cap (malleable iron), held in place by a bolted split coupling (malleable iron). The adapter and elbow are bolted together through the side of the tank.

Cleanout Cover and Frame

Special bolt channels are installed inside the tank at the top and sides of the cleanout opening. Gaskets are installed over the bolts outside the tank.

The frame is a fabricated, rectangular shaped, flanged steel sheet that is flanged all of the way around, both front and back. The back flanges are radiused to fit the outside of the tank. The holes in the bottom flange are punched to fit the tank chime.

Figure 9-24.-Bolts installed at cleanout opening.

The cleanout cover is a flat, rectangular steel sheet. Two formed, round steel handles are welded the outside face of the sheet.

HORIZONTAL CHANNEL.-Place the bolt channel above the cleanout opening inside the stave (fig. 9-24, #1). Insert 1/2- by I 1/4-inch bolts through all of the bolt holes. Be sure the bolt heads are square in the channel. Install the gasket along the full length of the top seam outside the stave. Allow a one bolt ho overlap at each end.

VERTICAL CHANNEL.- Each side seam the cleanout opening consists of one vertical row bolt holes. Place a bolt channel inside the tank on each row of bolt holes. Insert the bolts through all of the bolt holes. Be sure the bolt heads are square in the channels. Install the gasket along the full length each row of bolts. Pass the gaskets over the top sea gasket. Allow a one bolt hole overlap at each en Apply a heavy coating of sealing putty at the overlap of the top and vertical seam gaskets. Install the radii gasket under the vertical seam gaskets at the bottom chime of the stave.

CLEANOUT FRAME.-To assist in the installation of the cleanout frame (fig. 9-25, #2), push all of the chime bolts flush with the gasket on the chime of the bottom to provide clearance for sliding

Figure 9-25.-Cleanout cover installed.

the frame in place. Install the frame with the radiused flanges over the bolts with the flange against the outside of the stave. As the frame straddles a lap seam, make sure a wedge gasket is under the gasket at the seam. Work the bolts through the bottom flange of the frame. Install the nuts temporarily or enough bolts to hold the frame in place.

Install the gasket and the washer with the cup side down over the gasket on all of the seam bolts. Omit the gaskets and the washers on the chime bolts. Apply the nuts with a rounded face down on all of the bolts. Tighten them uniformly around the frame to maintain a leakproof joint.

CLEANOUT COVER- Work from the back and insert 1/2- by 1-inch bolts through the front flanges of the frame. Install the gasket along the full length of each row of bolts in the top and the bottom flanges. Allow a one bolt overlap at each end. Install the gasket along the full length of each row of bolts in the side flanges. Press the gaskets over the top and the bottom flange gaskets. Allow a one bolt hole overlap ate each end.

Apply a heavy coating of sealing compound at the overlap of the top and the side flange gaskets. Stand the cover (fig. 9-25, #6) in position with plates #7 and #8 set for direct reading, and slip the cover over the bolts. Install the gasket and the washer with the cup side down over the gasket on all of the bolts. Apply the nuts with a rounded face down on all of the bolts. Tighten the bolts uniformly around the cover to maintain a leakproof joint.

Cleaning Site

The tank erection crew must clear out all of the debris, paper, and any other matter of an inflammable nature, leaving a clean and neat installation for the pipeline crew or others. All of the tools and other erection equipment must be picked up and returned to the tank erection tool set.

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