Section IV. ASSEMBLY AND INSTALLATION OF TANK DECK

TM 5-5430-209-12

Section IV. ASSEMBLY AND INSTALLATION OF TANK DECK

8-17. Assembly of Deck Sections

and one plate is fitted with a liquid level indicator.

(3) One deck truss is assembled on 36 sections.

a. General.

Two deck trusses are assembled on the remaining

section. This section is identified as the first deck

(1) The assembled deck section consists of 74

section. The center deck section, assembled with the

tapered, flat, steel plates. There are 37 inner plates, all

manhole dome assembly, completes the assembly.

interchangeable, and 37 outer plates, also

interchangeable. The two plates are bolted together and

b. Layout and Assembly of Plates.

are then treated as 37 one-piece sections.

(1) Lay one inner plate (1, fig. 8-47) and one

(2) Six of the 37 outer plates are special plates.

outer plate (2) on the tank bottom.

Three plates are assembled with blind flanges, two

plates are assembled with a pressure vacuum valve,

Figure 8-47. Assembling inner and outer deck plates

(2) Place bolting channel under inner joining

joining seam of outer plate (2).

seam of outer plate (2). Insert 1/2 -by 1/4-inch bolts

(6) Install steel recessed washer 16), cupped

(3) through all except the end boltholes (5) of

side down, and nut (7) on each bolt (3). Tighten all

plate and channel. Make sure bolt heads set square in

bolts.

c. Assembling First Deck Section.

channel.

(3) Place a bolt retaining board under the

(1) Place blocking on tank bottom to support the

channel.

deck section. Locate blocking lengthwise to section so

(4) Install strip gasket (4) along the full length of

that it will not obstruct the boltholes in the lap seams.

joining seam. Allow a 2-bolthole overlap at each end.

(5) Joining seam of inner plate (1) overlaps

8-28