Figure 6-12. Assembling special deck plate

TM 5-5430-209-12

(4) Install pressure vacuum valve (3) over gasket

(1). Locate valve so that hinged side will be toward

small end of deck plate (2).

(5) Place steel recessed washer (4), cupped side

down, on each bolt. Install and tighten nuts (5).

6-15. Installation of Tank Deck

a. Deck Plates. Deck plates must be installed in

counterclockwise direction as viewed from the 'side

stave scaffold looking toward the center support. The

deck plates are lifted for installation by lowering the

tackle block with deck hooks (6, fig. 6-10) between the

rafter landing ring (1, fig. 6-8) and the side staves to

hook the inner end of the plate. Two men, each with a

rope and a deck hook, lift the outer end of the plate.

(1) First Deck Plate. The first plate installed is one

BOLT

assembled with a rafter under each lap seam.

CHANNEL

(a) Connect rope hooks to plate (1, fig. 6-14) and

DECK PLATE

lift it into position so that outer end is centered over a

RAFTER

stave seam with hangers (8, fig. 6-11) resting on the

stave chime and clips (7) resting on rafter landing ring

ME 5430-209-12/6-12

Figure 6-12. Assembling special deck plate.

(2) Install bolts and channels in each plate (3) from

bottom side, as shown in figure 6-12.

(3) Place blocking against boltheads and install 16-

hole gasket (1, fig. 6-13) over bolts on top side of plate

(2).

HATCH GASKET

DECK PLATE

PRESSUQ'E VACUUM VALVE

STEEL RECESSED WASHER

NUT

ME 5430-20912/6-13

Figure 6-13. Pressure vacuum valve installed.

6-14