Emergency Vent Valve

The emergency vent valve consists of a one-piece, flanged, round, cast steel body, fitted with lugs for a hinged vent. The vent is a one-piece, round, cast steel body, fitted with a lifting handle and hinge lugs. The vent comes attached to the flanged body hinges and seals the deck opening.

Place the manhole cover gasket over the bolt holes at the opening in the cover (fig. 9-21, #1). Insert 1/2by 1 1/2-inch bolts through two bolt hole channels. Work through the 10-inch hole and insert the bolts through the cover and the gasket. Install the vent valve (fig. 9-21, #2) over the bolts. Apply the nuts to the bolts. Tighten the bolts.

Manhole Air Intake

The manhole air intake consists of a one-piece, round, flanged sheet steel dust restrictor ring, a one-piece, round, fabricated steel bar, an inside screen ring, and a copper insect screen. The insect screen is attached to the screen ring by two outside rings, formed from steel bars. Flange bolts, inserted through the manhole cover, a dust restrictor ring, and steel pipe sleeve spacers attach the air intake to the manhole dome.

Wrap the insect screen around the outside of the inside screen ring. Join the ends of the screen with the copper wire weave. Install an outside screen ring at the top and the bottom of the insect screen to hold it in place. Make sure the screen is not knocked out of position. Tighten the bolts.

Install the screen ring on the top flange of the dome (fig. 9-20, #3). Insert the flange bolts through the cover, the dust restrictor ring, the steel pipe sleeve spacers, and the top flange of the dome (fig. 9-20, #3), in that order. Apply the nuts to the bolts and tighten.

Place the manhole cover gasket over the bolt holes at the opening in the cover. Insert 1/2- by 1 1/2-inch bolts through the two bolt hole channels. Work through the 10-inch hole and insert the bolts through the cover and the gasket. Install the blind hatch flange over the bolts. Apply the nuts to the bolts. Tighten the bolts.

Outside Ladder

The outside ladder consists of one bolted steel angle section. The top of the ladder is attached to the deck by two fabricated steel handrails. Two bolted steel angle braces support the ladder at the bottom chime of a stave.

Place the left side ladder section and the right side ladder section with similar bolting legs facing each other on top of several pieces of blocking of sufficient length to support both sections and spaced wide enough apart to install a ladder step (fig. 9-21, #6).

Select the bottom end of the ladder. Seven steps make up the assembled section. Insert 1/2- by 1-inch bolts through the ends of the step and the sections, in that order. Install a nut on each bolt protruding through the sections. Tighten the bolts after all of the steps are installed. Install the braces at the bottom of the section.

The leg with three bolt holes near each end of the braces is attached at the outside face of the vertical legs of the sections. Insert a bolt through the end bolt hole in the sections and the brace. Install the nuts on the bolts. Finger tighten the bolts. Install the handrails at the top of the sections. Insert the bolts through the horizontal legs of the sections and the rails, in that order. Install the nuts to the bolts. Tighten the bolts.

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.

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