Figure 3-23. First deck plate installed

TM 5-5430-209-12

(2) Guide large end of plate and pull plate in

(5) Apply four equally spaced finger-tightened

place by means of haul line (9, fig. 3-22).

nuts to the bolts through large end of plate. One nut will

(3) Lower large end of plate over proper bolts

be sufficient to hold the small end in place. Do not

in top chime of the staves so it will straddle a vertical

tighten bolts.

seam.

(4) Small end of plate will drop over the

proper bolts (3, fig. 3-23). Release hooks.

GASKET

MANHOLE DOME

BOLT

FIRST DECK PLATE

PRESSURE VACUUM VALVE

Figure 3-23. First deck plate installed

(3) Left lap seam of last plate slips under

e. Installing Second Deck Plate.

right lap seam of first plate. Right lap seam of last plate

(1) Install gasket over bolts at left lap seam of

is placed over bolts in left lap seam of next-to-last plate

plate (4, fig. 3-23).

installed.

(2) Face small end of the plate. Install this

(4) Make necessary adjustments in the deck

plate and all remaining plates to left of first plate, or in a

if the last plate fails to fit properly.

counterclockwise direction around the tank.

(5) Remove nuts temporarily installed on all

(3) Raise the second plate and install it in

bolts in plate lap seams. Install a steel washer (4, fig.

accordance with procedures outlined in d above. Place

3-3), and nuts (5) on all bolts except on bolts in

right lap seam over bolts in left lap seam of first plate

top chime of staves. Install any missing nuts on chime

(4). and large end over proper bolts in top chime of

bolts. Make sure rounded head of nut is against the

staves.

plate and/or washer. Tighten the bolts.

(4) Install small end of plate following

(6) Remove the scaffold. Install washers and

procedures outlined in d above.

nuts on all bolts in vertical seams. Return brackets and

(5) Install nuts (5, fig. 3-21) on six equally

posts to the tank tool erection set. Remove gin pole (1.

spaced bolts in lap seam of plates. Install nuts on all

fig. 3-22) after all deck plates are installed.

bolts in the chime. Finger tighten all nuts.

NOTE

h. Installing Manhole Cover.

NOTE

Since the deck will have to be adjusted as plates are

If tank is used for water storage, omit emergency

Installed, do not tighten any bolts until deck is

vent valve (2, fig 3-24) Install manhole cover (1)

completely Installed Raise or lower center support

after installing manhole air intake.

ladder as required to fit plates in place

(1) Install a 28-bolthole gasket on top of

f. Installing Intermediate Deck Plates. There are

flange of dome (2, fig. 3-23).

three intermediate plates. The special plates remaining

(2) Insert bolts through flange and gasket, in

are installed to suit field conditions. Raise and install

that order. Gasket will hold the bolts down.

these plates following procedures outlined in (t and e

(3) Install manhole cover (1., fig. 3-24) over

above.

the bolts. Install washer and nut on all bolts. Install

g. Installing Last Deck Plate.

washer and nut as described in paragraph f (5) above.

Tighten the bolts.

(1) Raise last deck plate before next-to-last

plate is installed.

(2) Raise right lap seam of first plate.

3-20