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H.
Rotate
clockwise until pressure starts
to flow past plug. Purge air
through bleeder valve. After
air is completely purged, close
bleeder
retracting the plug to zero
mark on body tube.
4.0 Preventive
Maintenance
4.1
Preventive
Checklist
Maintenance of existing PIG-SIG
IV Scraper Passage Indicators is
important to continued proper
operation. If your PIG-SIG is not
working properly (indicating Pig
passage) or has worked but is not
working
currently,
installation procedures in this
instruction manual.
Below is a checklist of items to
consider
during
scheduled
inspections.
1. Is
the
properly? – When looking at
the TDW flag, the flag should
be turned down ¼ turn
clockwise. This is the proper
position before Pig passage.
Once the Pig has passed, the
flag should be standing up.
The flag will need to be reset
before the next Pig passage.
2. If the PIG-SIG is electrical,
is the indicator properly
wired? Are the wires still
handle
counter-
valve.
Continue
Maintenance
refer
regularly
maintenance
flag
positioned
connected to the terminals in
the microswitch?
3. Check
ensure
properly.
A. Remove the cover on the
B. Is the pin in the cam
C. Are the set screws in the
D. Loosen
to
E. Using a screwdriver, turn
4. Is
26
the
indicator
it
was
indicator.
setting between the legs
of the torsion spring? The
legs of the spring should
be crossed and on each
side of the pin in the hex
cap.
spring retainer and cam
tightened to the shaft?
the
screws
in
the
retainer. Remove it and
the top torsion spring.
Loosen
the
screws in the cam.
the shaft in the center of
the cam. The shaft should
rotate freely at least 90
degrees.
the
plug
(flapper)
properly?
i. For
uni-directional
plugs, turn the shaft
counterclockwise until
it comes to a stop.
Tighten the two set
screws in the cam. This
is
the
position
trigger should be in
before the Pig passes.
The springs will reset
to
installed
two
set
spring
two
set
trigger
positioned
the
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