Assembly of Special Plates

TM 5-5430-209-12

3-15. Assembly of Special Plates

(2)

Drop open bottom of gin pole (1) over a bolt (6). With

the pole standing as near vertical as possible, apply lashing

WARNING

(7) to pole and rail. Locate lashing near the bottom and top of

If tank is to be used for water storage, omit the pressure

rail.

vacuum valve. Install blind hatch flange set in place of

pressure vacuum valve.

a. Pressure Vacuum Valve.

(1)

Install a pressure vacuum valve (5, fig. 3-23)

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

and insert bolts through the plate. Place blocking under bolt

heads to hold them in place while installing gasket.

(2)

Install a 16-hole gasket over the bolts.

(3)

valve over bolts.

(4)

Apply nuts to bolts and tighten.

(5)

Remove blocking used in step (1) above.

b. Blind Hatch Flange Set. Install blind hatch flange set

on the water inlet opening deck plate. Use the same bolts.

channels, and gasket as in steps a (1) and (2) above. Follow

above procedures.

c. Level Indicator. The level indicator deck plate (1, fig.

3-20) is installed, with level indicator fittings as received.

3-16. Installing Deck Plates

a. Layout of Assembled Plates. As plates are

assembled, raise them up and stand them against the scaffold

(fig. 3-20); move in a counterclockwise direction. Place each

plate so that it straddles a vertical seam of the side staves in

its approximate installation position.

b. Adjustment of Center Support Ladder.

(1)

Check and adjust ladder (fig. 3-19) to the

correct height before installing deck plates. Distance from top

of the tank bottom to outer face of top flange of the dome (7)

is 9 feet, 1/8 inch. Raise or lower ladder as required.

(2)

Place a jack under one of the ladder steps (4).

Adjust ladder so that in its final position, one set of holes in

the bottom of rails (1 and 2) lines up with holes in brace (8).

Lock the jack.

(3)

Insert bolts (3) through the rails (1 and 2) and

brace (8). Apply nuts (5) to bolts (3); tighten the bolts.

(4)

Unlock and remove jack.

NOTE

When all deck plates have been installed on tank check height to

outer face of top flange of manhole dome above the top of the

tank bottom. If it is not the required height. adjust ladder until It Is

the correct height. Insert bolts (3. fig. 3-19) in alined bolt holes

GIN POLE

and tighten nuts (5).

LADDER RAIL

c. Gin Pole. To install deck plates (fig. 3-20), remove

MANHOLE DOME

BLOCK AND TACKLE

and assemble gin pole components, less the foot spike, that

HEAD BLOCK EYE

are provided in the storage tank erection outfits.

LAP SEAM BOLT

(1)

Raise the pole (1, fig. 3-22) alongside one of

LASHING

the ladder rails (2). As the top of the pole (1) passes through

ROPE DECK HOOK

the dome (3), attach block and tackle (4) to head block eye

HAUL LINE

(5).

Figure 3-22. Gin pole installed

d. Installing First Deck Plate. The first plate installed is

the plate with the pressure vacuum valve (2. fig. 3-20).

(1)

Attach two rope deck hooks (8. fig. 3-22) to

small end of plate (4, fig. 3-23) while it stands against the

scaffold.

3-19