Manhole Air Intake

TM 5-5430-209-12

6-18. Manhole Air Intake

manhole dome (1) so that the inner ring tits outside the

bolt circle of the dome.

a. General. The manhole air intake is used on

(5) Place dust restrictor over the assembled screen

water storage tanks and installed on the manhole dome.

and rings.

It consists of the following components: insect screen,

(6) Working through the opening in the dust

inside screen ring, outside screen ring, dust restrictor,

restrictor, install sleeve spacers between the restrictor

manhole cover, flange bolts, and sleeve spacer.

and manhole dome at alternate bolt holes. Aline the

b. Installation.

holes.

(1) Remove nuts (4, fig. 6-18) and manhole cover

(7) Install the manhole cover on the dust restrictor.

(3) from dome (1). Remove the bolts (2) and gasket.

Insert flange bolts through all holes from the top side.

(2) Wrap the insect screen around the outside of

Install a nut on each bolt and tighten securely.

the inside screen ring. Join the ends of the screen with

6-19. Water Drawoff Valve

copper wire weave.

a. General. The water drawoff valve (7, fig. 6-

(3) Install an outside screen ring around the insect

21), installed in special stave (3), is a 2-inch antifreeze-

screen at the top and bottom. Make sure the screen is

type valve. It is used to drain water from petroleum

properly positioned on the inside ring. Tighten the bolts

storage tanks. A 2-inch flange set (4) and 11/2-inch

and nuts on the outside rings.

steel nipple (6) are used with the valve.

(4) Install the assembled screen and rings on

ME 5430-209-12/6-21

1. GASKET

2. BOLT

3. STAVE

4. OUTSIDE FLANGE HALF

5. NUT

6. STEEL NIPPLE

7. WATER GRAWOFF VALVE

Figure 6-21. Water drawoff valve installed.

b. Installation

(b) Cut fort 1-hole gaskets (1, fig. 6-22) from

(1) Flange Set

strip gasket. Place one gasket under the head of each

(a) Dissemble flange set by removing nuts and

bolt (2).

bolts

6-23