Section IV. ASSEMBLY AND INSTALLATION OF TANK DECK

TM 5-5430-209-12

Section IV. ASSEMBLY AND INSTALLATION OF TANK DECK

4-14. General

d. Place angle (3) against inside of flange. Insert

four bolts (4), equally spaced, through the angle and

The assembled deck consists of 10 tapered, flat, steel

flange. Install and tighten nuts (5) on bolts (4).

plates (2, fig. 4-8). There are three special plates: two

e. Turn plate over with flange down. Install gasket

are fitted with a pressure vacuum valve, and the third

with a liquid level indicator.

All plates are

(6) along full length of right lap seam. Allow 2-bolthole

interchangeable.

overlap at each end.

4-15. Layout and Assembly of Deck Plates

4-16. Assembly of Special Plates

WARNING

a. Lay plates around the outer perimeter of tank

If this tank is to be used for water

foundation.

b. Place blocking on ground spaced to fit inside the

storage, omit the two pressure

vacuum valves. Install blind hatch

confines of the plate. Lay plate on blocking with flange

flange sets in place of pressure

up.

c. Place channel (1, fig. 4-9) on right lap seam at

vacuum valves.

the flange. Insert bolt (2) through all except the end

a. Pressure Vacuum Valve. Install a pressure

boltholes of plate and channel. Make sure bolt heads

vacuum valve on the pressure vacuum valve opening

set square in the channel.

deck plate (2, fig. 3-20) and (2, fig. 4-8) as follows:

(1) Insert 1/2 by 1-1/2-inch bolts through eight

two-bolthole channels. Work through the 8-inch hole

and insert bolts through plate. Place blocking under bolt

heads to hold them in place while installing the gasket.

(2) Install a 16-hole gasket over the bolts.

(3) Install valve over bolts.

(4) Install nuts on bolts and tighten bolts.

(5) Remove blocking used in step (1) above.

b. Level Indicator. The level indicator deck plate is

installed with the level indicator fittings as received.

4-17. Installation of Deck Plates

a. Layout of Assembled Plates. As plates are

assembled, raise them up and stand them against the

scaffold (fig. 3-20). Place each plate so that it straddles

a vertical seam of the side staves in its approximate

installation position, counterclockwise.

b. Adjustment of Center Support Ladder.

(1) Check and adjust ladder (fig. 4-7) to the

correct height before installing deck plates.

The

distance from top of tank bottom to outer face of top

flange of the dome (7) is 9 feet, 3 13/32 inches. Raise

or lower the ladder as required.

DECK PLATE CHANNEL

(2) Place a jack under one of the ladder steps

BOLT

RAFTER BOLT RETAINING ANGLE

(4). Adjust ladder so that in its final position one set of

BOLT

holes in bottom of the rails (1 and 2) lines up with holes

NUT

in the brace (8). Lock the jack.

STRIP GASKET

(3) Insert bolts (3) through the proper bolt

holes in brace (8) to match the top holes in rails (1 and

Figure 4-9. Deck plate assembly.

2). Install nuts (5) on bolts (3); tighten the bolts.

4-9