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Figure 4-5. Adjusting installed bottom plates
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TM-5-5430-209-12 Tank Steel Vertical Boted Knockdown Sealed Openings Standard Bottom and Roof Gasoline Oil or Water Manual
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Figure 4-7. Center support ladder assembled
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.
1.
6-INCH OUTLET STAVE
2.
PLAIN STAVE
3.
4-INCH OUTLET STAVE
4.
2-INCH WATER DRAWOFF STAVE
5.
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

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