Baker Hughes Panametrics Sentinel LCT8, User Manual

Page: 96 / 138

4.2.2 Servicing the sensor ports and transmitter connection
WARNING!
Before you open the sensor ports or the
transmitter connection, the system must be
completely de-pressurized!
The sensor ports contain the sensors and sensor wiring.
These ports should only be serviced by properly trained and
qualified service technicians. Modification or alteration in
any manner may degrade the performance of the system.
4.2.2.1 Required equipment
Before proceeding, ensure that the following tools
are available:
• 10 mm hex drive socket or wrench
• 12 mm hex drive socket or wrench
4.2.2.2 Checking for internal leaks
To relieve the system pressure, see Figure 90 below and
Figure 91 below to complete the following steps:
1. Locate the upstream “A” plane sensor quadrant. This
quadrant can be found by locating the tag plates on the
pressure vessel (see Figure 2 on page 4 ).
Port 1 DN
Partition lines
concurrent with pipe axis
Port 2 DN
Port 3 DN
Port 4 DN
Flow
direction
arrow
“A” plane
Port 1 UP
Port 2 UP
Port 3 UP
Port 4 UP
Figure 90: Upstream “A” plane sensor quadrant - top view
Pressure relief
plug location
Flow direction
Figure 91: Upstream “A” plane sensor Quadrant - side view
2. Relieve potential pressure build-up by loosening the
pressure relief plug on the bottom of the upstream “A”
plane sensor quadrant (see Figure 91 above), using a
10 mm hex drive socket or wrench. Slowly loosen the
pressure relief plug 2-3 full turns or until the plug bottoms
out on the built-in safety stop.
3. Listen to and observe the area near the pressure
relief plug:
a. If any hissing is heard, indicating air or gas release,
stop loosening the plug and wait for the hissing to
stop. If the hissing continues for more than 10 minutes,
re-tighten the plug and consult Panametrics.
b. If any liquid discharge is observed, stop loosening the
plug and re-tighten it completely.
WARNING!
If any liquid discharge is observed at the
pressure relief plug, then the process
pressure must be removed from the pipeline
prior to servicing the sensor ports or
transmitter connection.
c. If no hissing or discharge is observed and the plug
has been backed out to the safety stop, then any
pressure buildup has been released and the ports are
now serviceable.
4. Avoid servicing the equipment contained within
the sensor ports and transmitter connection, as it is
serviceable only by factory trained service technicians.
5. After the service work is complete, all sensor port plugs
and the pressure relief plug should be reinstalled and
tightened fully.
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