Compression fitting
nut
Process adapter
fitting
Ball valve
Compression fitting
F1
F2
F3
F4
i
i
Removal of the Meter
Follow these instructions for safe removal of the meter from the pipe.
WARNING! SYSTEM MAY BE UNDER HIGH PRESSURE.
Do not attempt to remove meters with the standard process adapter fitting from a pipe
pressurized above 60psig without first relieving pressure in the pipe.
Do not attempt to remove any meter with the high pressure process adapter fitting and cable
assembly from a pipe pressurized above 100 psig without first relieving pressure in the pipe.
WARNING! When removing the flow meter, be sure to hold the electronics enclosure
firmly by hand before unscrewing the compression fitting nut. Failure to do this will allow
the pressure in the pipe to suddenly and rapidly force the meter from the pipe potentially
causing serious injury. The meter could also be damaged resulting in a loss of gas from the
pipe. The force required to hold the meter will be 0.44 times the pipe pressure. If you are
unsure of your ability to hold the meter for any reason, do not loosen the compression fitting
nut.
Procedure:
1. Slowly unscrew the compression fitting nut
while maintaining a firm grip on the enclosure
to counteract the effect of pressure in the pipe.
2. Once the nut is fully disengaged from the
threads, the meter will be free to move.
Carefully withdraw the flow meter stem from
the pipe until the sensor head is fully inside the
process adapter fitting.
3. After the meter is completely withdrawn, slowly
close the valve to isolate flow.
NOTE
:
At this point, the flow meter is isolated
from the pipe, but the process adapter fitting
will contain a small volume of process gas
under pressure.
4. After the valve is completely closed, slowly
unscrew the compression fitting from the
top of the process adapter fitting leaving the
adapter fitting on the ball valve.
NOTE
:
As the compression fitting is removed, pressure will be vented from the ball
valve.
5. For meters provided with the high pressure process adapter fitting, disconnect the safety
cable at the bottom by removing the capture nut (refer to Fig. 2.7b). Be sure to fully re-
attach the nut to the cable once the meter is removed from the pipe.
11451 Belcher Road South, Largo, FL 33773 • USA • Tel +1 (727) 447-6140 • Fax +1 (727) 442-5699 • [email protected]
F-5500 Thermal Mass Flow Meter Manual 06/17 - 2030 / 107023
Page 25
Model F-5500
INST
ALL
A
TION
Installation: Insertion Type
Removing
the Meter
