Weld-On Adapter - ABB SensyMaster FMT230 Commissioning Instruction

12 SENSYMASTER FMT230, FMT250 THERMAL MASS FLOWMETER | CI/FMT230/250-EN REV. A
4.4.2

Weld-on adapter

Consider the following points when installing the welding dater
in the piping:
— After welding, the welding adapter must have a length of L
(see chapter 'Mounting dimensions – welding adapter with
flange and with and without ball valve' on page 13 and
'Assembly dimension - welding adapter with threaded
connection in accordance with DIN 11851' on page 14 ).

 
L h
1 2 /
L Length of the welding adapter
h Installation length of the sensor
D Outside diameter of the pipeline
— Shorten the length of the welding adapter as needed
before welding it on. After welding, the welding adapter
may protrude into the piping no more than 10 mm
(0.39 inch).
— Observe thickness of pipeline wall and degree of
shrinkage when welding!
— The distance h from the upper edge of the adapter
flange to the pipe central axis must be within a
tolerance of ± 2 mm (0.08 inch).
— Maintain a right angle to the pipe axis (max. tolerance 2°).
— The adapter centering pin must be aligned with the pipe
axis in the flow direction (outflow side, behind the
measuring point).
— Once welding is complete, there must be free clearance of
at least 28 mm (1.10 inch) to install the sensor; drill to create
clearance as needed.
Change from two to one column


D
Additional instructions for welding adapter with ball valve
DANGER
Danger to life due to improper installation!
During welding, the gaskets in the ball valve may overheat.
This can lead to the measuring medium escaping in an
uncontrolled manner. This can result in severe injuries or
death.
Remove the ball valve before welding.
Versions featuring a ball valve enable the flowmeter sensor to
be installed and disassembled at low gauge pressures in the
pipeline with minimal gas leakage.
The design with ball valve is installed as described above, but
the following indications must be observed in addition:
— To install the sensor, the ball valve must be opened
completely. Then, the flowmeter sensor can be installed
along with the appropriate gasket and screwed into place.
— Before disassembling the sensor, make sure that the
pipeline has been depressurized. Then, you can release the
screws on the flange, remove the flowmeter sensor and
close the ball valve.
NOTICE
Damage to the sensor.
Closing the ball valve before you remove the sensor can
seriously damage the protective cage or the sensor elements.
Do not close the ball valve until the flowmeter sensor has been
removed.