Section IV. ASSEMBLY AND INSTALLATION OF TANK DECK

TM 5-5430-209-12

b. Determine which end of rails (1 and 2) will be

long enough to support both rails and wide enough apart

to insert ladder step (4).

the bottom. Install steps (4) from bottom toward top of

the ladder.

c. Insert /2-by 1-inch bolts (3) through ends of step

(4) and rails (1 and 2) in that order. Secure bolts with

nuts (5). Tighten bolts after installing all steps.

d. Face the 28-bolthole flange of the manhole

dome (7) and slide dome over top of rails. Use drift pin

and aline the three boltholes at top of rails with similar

holes in side of dome. Insert 1/2 -by 11/4 -inch bolts (6)

through rails and dome in that order. Secure the bolts

with washers and nuts; tighten the bolts.

e. Install a 30-bolthole gasket on the inside face of

the bottom flange of dome. Insert /-by 11/4-inch bolts

through flange and gasket. Gasket material will hold

bolts in place.

3-12. Installation of Ladder

a. Raise ladder assembly (fig. 3-19) and set front

legs of rails (1 and 2) against the inside face of the

vertical leg of brace (8).

b. Insert bolts (3) through the rails and brace in

that order.

c. Install nuts (5) on bolts (3). Tighten the bolts.

LEFT LADDER SUPPORT RAIL

RIGHT LADDER SUPPORT RAIL

BOLT

LADDER STEP

NUT

BOLT

MANHOLE DOME

LADDER BRACE

Figure 3-19. Center support ladder assembled.

Section IV. ASSEMBLY AND INSTALLATION OF TANK DECK

3-13. General

valve, one is assembled with a blind flange, and the

remaining plate is fitted with a liquid level indicator.

The assembled deck consists of six, tapered, flat, steel

All plates are interchangeable.

plates (1, fig. 3-20). There are three special plates: one

plate is fitted with a pressure vacuum

3-17