Tank

TM 5-6640-213-14

Pump assembly includes: . . . . . . . . . . . Positive-negative pump, motor,

positive and negative gages, and

outlet filter silencers

2. Tank. The air suge tank ensures a continuous

air flow. A relief valve, located on the air surge tank, is set to

open at 25 psi (1.76 kg/sq cm). A T-fitting and a gate valve located

in the air pressure line provide the option of delivering pressure

either to the manometer or to the tabletop-mounted air stopcock for

other operations. The manometer, located in the left-hand corner of

the laboratory, reads the line pressure. A pressure regulator is

placed in the pressure line in a position where it can be adjusted by

a technician while he observes the manometer, or while he checks a

Reid vapor pressure (RVP) gage connected to the end of the air

pressure line. The vacuum outlet on the pump is connected directly

to a tabletop-mounted stopcock located to the left of the sink.

(b) Operating Instructions.

Make sure that the pressure regulator is set for

zero pressure before turning on the pump.

1. To supply air pressure to the tabletop-

mounted stopcock (8), proceed as follows:

(a) Close the needle valve (3, fig. 2-4) in

the line downstream of the T-fitting leading to manometer (9).

(b) Set the ON-OFF switch, located in wire

mold to the left of the sink, in the ON position.

the tank.

(d) Open and close the tabletop-mounted air

"Air," as needed

stopcock marked

NOTE

The 25 psi relief valve (4) relieves the pressure

when 25 psi (1.76 kg/sq cm) pressure is reached in

the tank. Do not operate the pump needlessly.

2. To supply air pressure to the manometer for

calibrating RVP gages, proceed as follows:

2-12