ABB TB404, Operating Instruction, Page: 33 / 40

PURPOSE/SCOPE
PR5 - 1
PROCEDURE PR5 - REMOVING SENSOR FROM HOT TAP
ASSEMBLIES
PURPOSE/SCOPE
This procedure explains how to remove the sensor from hot tap assemblies.
Parts
Tools None
SAFETY CONSIDERATIONS
PROCEDURE
R
1. Firmly grasp the insertion rod assembly and loosen the compression fit-
ting (Fig.
PR5-1 ).
R
2. Slowly retract the sensor until it is fully extended.
R
3. Close the ball valve.
R
4. Relieve the internal pressure in the compression fitting body or extrac-
tion housing (Fig.
PR5-1 ) by opening one of the two ¼-inch flushing ports.
R
5. Flush the internal chamber if required, and drain the extraction housing.
5 min.
Number Qty Description
4TB8006-0025 A/R Silicone grease
4TB8006-0045 A/R Anti-seize compound
Customer-supplied A/R Pipe sealant
WARNING
1. Firmly hold the insertion rod when loosening the compres-
sion fitting. When the compression rod is loosened, the pres-
sure against the sensor assembly will cause the insertion rod
to retract from the ball valve assembly with great velocity. This
could injure personnel standing in the path of the retracting
insertion rod. Allow only properly trained personnel to handle
these types of sensor assemblies.
2. Open one of the flushing ports after the sensor is retracted
and the ball valve is closed. If a continuous stream of liquid
exists, damage to the ball valve or components can occur or
may have already occurred. This condition can cause a hazard
to personnel upon removal of the insertion rod.
W1
W2
A/R = as required