4-70. JET LEVEL SENSOR REPLACEMENT (Con't).
d. INSTALLATION OF JET LEVEL SENSOR TUBING AND FITTINGS
When working inside tank, always provide adequate forced air ventilation
at the manhole opening with air directed into compartment where work
is being performed. Forced air ventilation allows for removal of any ex-
plosive quantities and contaminants resulting from the type of work be-
ing done, and serves to prevent oxygen deficiency. Failure to follow this
warning may result in death to personnel.
NEVER work alone inside a tank; a second person must be stationed at
the manhole opening. The person inside the tank must have a safety line
and harness on in case of emergency for rescue operations. In the event
a rescue operation is required, summon assistance IMMEDIATELY. DO
NOT attempt a rescue until assistance has arrived.
All male threads of fittings should be coated with antiseize tape if not
already factory-coated with an antiseize compound.
Install nipple, bushing, and tee (17) to pilot valve (18). Install straight adapters (15 and 16) to
Install nipple (28), coupling (29), and straight adapter (30).
Install tubing (14) between straight adapters (16 and 30).
Install nipple (21), coupling (20), and straight adapter (19).
Use caution when securing tubing (4 and 11) under clips (13). Improper
handling of clips will cause them to break.
Position tubing (4 and 11) between emergency valve (12) and jet level sensor (6). Allow a
6-12 in. (15.2-30.5 cm) slack loop in tubing at emergency valve and jet level sensor.
Secure tubing with clips (13). Use a soft-faced hammer to gently tap clips back into position.
Install all tubing at jet level sensor (6), emergency valve (12), and strainer
assembly (24) as tagged.
At emergency valve (12), connect tubing (4 and 11) to straight adapters (15 and 19).