Scaffold

TM 5-5430-209-12

(4) Install remaining bolts (3) in chime of the bottom

and install nuts (5, fig. 8-26). In the first row of the

seam bolt holes, in every other stave, install -by 1 -

inch bolts in the third and twentieth boltholes counted

down from the top chime. These are the scaffold

mounting bolts. Install remaining bolts (2, fig. 8-27) in

all seams. Install steel recessed washer, cup side down,

on all seam bolts. Install nuts, rounded face down, on

all bolts.

(5) Tighten all bottom chime bolts uniformly.

Remove blocking (1, fig. 3-15) placed under the bottom

chime. Use heavy long timber (2) as a lever and short

timbers (3) as a fulcrum to lift the chime. Tighten all

seam bolts.

(6) Apply sealing compound to the inside perimeter

of bottom chime (3, fig. 3-16) of the staves.

8-11. Scaffold

a. General. Before installing second ring staves, it is

necessary to install a portion of the scaffold

components, provided in the storage tank erection outfit,

around the top chime of first ring staves.

b. Installation. Refer to paragraph 3-8 and install the

SECOND RING STAVES

STRIP GASKET

scaffold.

WEDGE GASKET

NOTE

BOLT

Build as many temporary ladders as necessary to reach

OPEN BOLT HOLE

the various heights of the scaffold at strategic points

ME 5430-209-12/8-31

around the tank.

8-12. Dressing the Top Chime

Figure 8-31. Dressed top chime of first ring staves

a. Install strip gasket (2, fig. 8-31) to cover all bolt

b. Insert wedge gasket (3) under strip gasket (2) at

holes. When one roll of gasket material is exhausted

each lap formed by adjoining staves.

and a new roll is started, the overlap should extend over

two bolt holes. Apply sealing compound at each end of

overlap.

8-17