Section II. ASSEMBLY AND INSTALLATION OF SIDE STAVES

TM 5-5430-209-12

Section II. ASSEMBLY AND INSTALLATION OF SIDE STAVES

NOTE

4-8. Assembly of Side Staves

a. General. This is a single ring tank. Place all

Stave assemblies for petroleum and

water storage tanks are all the same

center support ladder components and manhole dome

except for special fittings.

on tank bottom before laying out staves around the

b. Layout of Staves. Four special and six plain

perimeter of tank foundation. This is to avoid having to

staves make up the ring.

lift them over the tops of the staves later. Top and

(1) Place staves with openings and pipeline

bottom flanged edges of staves are called chimes; side

connections in proper position (fig. 4-6).

edges are called vertical seams. The staves have a

single row of boltholes in each seam.

6-INCH OUTLET STAVE

PLAIN STAVE

4-INCH OUTLET STAVE

2-INCH WATER DRAWOFF STAVE

CLEANOUT STAVE

Figure 4-6. Layout of staves around tank bottom.

Refer to paragraph 3-7 c and install the side staves.

(2) Lay out remaining staves around

NOTE

perimeter of tank bottom. Place staves with chimed

In paragraph 3-7 c (1), the first stave

side down so that each stave straddles a radial seam of

the bottom.

and all subsequent staves straddle a

NOTE

radial seam. In paragraph 3-7 c (3),

Staves have an offset at top and bottom

seven intermediate staves are installed.

The top is determined by looking at the

4-10. Scaffold

stave in a vertical position from the

outside. In proper position, offsets are

Before installation of the tank deck it is necessary to

at lower left and upper left corner

install a portion of the scaffold components, provided in

c. Dressing Staves. Refer to paragraph 3-7 b (2)

the storage tank erection outfit, around the top chime of

and dress the staves.

the staves. Follow the procedure outlined in paragraph

d. Preparing Outer Edge of Tank Bottom. Refer to

3-8.

paragraph 3-7 b (3) and prepare the outer edge of the

4-11. Dressing Top Chime

tank bottom.

4-9. Installation of Side Staves

Refer to paragraph 3-9 and dress the top chime.

Section III. ASSEMBLY AND INSTALLATION OF CENTER SUPPORT LADDER

4-12. Assembly of Center Support Ladder

b. Assembling Ladder.

a. General. The ladder consists of a bolted, steel

(1) Place ladder rails (1 and 2, fig.

4-7),

with

similar bolting legs facing each other, on top of several

angle section. Top of the ladder is fitted with a manhole

pieces of blocking. Blocking should be long enough to

dome. Bottom of the ladder is fitted with ladder braces

support both rails and wide enough apart to insert a

(flanged, flat, steel plates). The small ends of the deck

ladder step (4).

plates are bolted to the bottom flange of the manhole

dome.

4-6