Section V. ASSEMBLY AND INSTALLATION OF TANK ACCESSORIES

TM 5-5430-209-12

g. Installing Last Deck Section.

plate (1, fig. 8-55) in that order. Install nut on bolt and

tighten.

(1) Raise last deck section (3, fig. 8-55) before

(6) Remove nuts temporarily installed on all

the next-to-last section (4) is installed.

bolts in the deck lap seams. Install steel recessed

(2) Install two wedge gaskets (5) in the deck

washer, cup side down, and nut on all bolts (5, fig. 8-

opening on top chime of third ring. Follow procedure

55), except on bolts in the top chime of the third ring.

described in paragraph 8-4d (1) and shown in figure 8-

Make sure rounded head of nut is against the washer.

16.

Tighten the bolts.

(3) Install last section (3, fig. 8-55) by placing its

h. Install Center Deck Plate.

lap seams over the lap seams of adjacent sections (2

(1) Insert 1/2-by 1 1/4-inch bolts (6, fig. 8-55)

and 4). The large end fits over the bolts in the top

through small end of sections forming the outer bolt

chime of the third ring. If the last section does not fit the

circle of center deck plates.

adjacent sections and the inner support properly, raise

(2) Apply strip gasket (7) to bolts (6). Install

or lower the center support, c above, until the proper fit

wedge gasket (5) under strip gasket (7) at lap seam of

is obtained.

every deck section.

(4) Remove boom (3, fig. 8-52) and lower to

(3) Place center deck plate (1, fig. 8-56), over

ground. Disassemble the boom and return the items to

bolts (6, fig. 8-55). Install steel recessed washer, cup

the storage tank erection outfit.

side down, and nut on each bolt protruding through the

(5) Install step plate (1, fig. 8-55) at top of top

plate. Make sure rounded head of nut is against

center support (1, fig. 8-44). Aline bolt holes and insert

washer. Tighten all bolts.

a 1-by 9-inch bolt through the support (1) and

Section V. ASSEMBLY AND INSTALLATION OF TANK ACCESSORIES

8-19. Manhole Dome

b. Installation.

a. General. The manhole dome consists of one-

(1) Place manhole cover gasket (7, fig. 8-56)

over the cover flange of dome (6). Insert bolt (8)

piece, flanged, tubular, steel sheet. It is attached to the

through all bolt holes in the dome flange and gasket (7)

hatch in the center deck plate. The deck flange has 30

in that order. The gasket will hold the bolts in place.

bolt holes. The cover, or vent flange, has 28 bolt holes.

b. Installation.

(2) Install the flange of vent (9) over bolts (8).

Install steel recessed washers, cup side down, and nuts

(1) Place deck gasket (5, fig. 8-56) over the

on each bolt (2).

hatch boltholes in center deck plates (1). Insert bolts (2)

through all bolt holes in the plates (1) and gasket (5) in

8-21. Access Ladder

that order. The gasket will hold the bolts in place.

a. General. The access ladder consists of three

(2) Install wedge gasket (4) under the gasket (5)

at the lap seam of the plates (1).

bolted, steel angle rails. The top section of the ladder is

(3) Install the 30-bolt hole flange of dome (61

attached to the deck by two fabricated, steel handrails.

over bolts (2). Install a steel recessed washer, cup side

Bolted, steel angle braces support the ladder at the

down, and a nut, rounded head down, on each bolt (2)

remaining stave chimes.

b. Assembling Bottom Section.

protruding through the flange of dome (6).

(1) Place two ladder rails (1 and 2, fig. 8-57)

8-20. Emergency Vent

with similar bolting legs facing each other, on top of

a. General. The vent is a one-piece, round, cast

several pieces of blocking sufficiently long to support

both rails spaced wide enough apart to install a ladder

steel body fitted with a lifting handle and hinge lugs.

step (3).

The vent comes attached to the flanged body by hinges,

and seals the deck opening.

8-36