3 Mounting
If the meter's flow velocity is:
• Below 0.3 to 0.5 m/s, install the meter as a free-stream application.
• Above 0.3 to 0.5 m/s, install the meter as either a T-piece or flow chamber application.
As an alternative, if the pipework can be expanded to reduce the flow velocity to
between 0.3 to 0.5 m/s, install a free stream application.
3.1 Free stream applications
3.1.1 Mount in free-stream application (flanged fitting)
Prerequisites
• Free-stream (flanged) installations are recommended for processes with the following
conditions:
Flow 0.3 to 0.5 m/s at the meter
Viscosity
— Up to 500 cP with long tines
— Up to 20,000 cP with short tines
Temperature -58 °F (-50.0 °C) to 392 °F (200 °C)
-40 °F (-40.0 °C) to 392 °F (200 °C) in hazardous areas
Note
If temperature variations are a critical factor in your process, the reduced thermal mass
of the taper-lock fitting of the weldolet can track changes in temperature more
efficiently.
• Before fitting the weldolet, you must bore a 2.1 in (53 mm) diameter opening in the
pipeline to accept the meter. You must weld the weldolet to the pipeline concentrically
with the pre-bored hole.
Procedure
Use Figure 3-1 to mount a meter in a free-stream flanged fitting installation.
• Insert meter tines directly into the fluid flow.
• For both vertical and horizontal pipes, always install the meter on the side of the pipe.
For a horizontal pipe, never mount the meter on the top of the pipe.
Important
During installation, always position the meter so that the gap between the tines is vertical.
This position helps prevent the trapping of bubbles or solids on the meter – allowing the
solids to sink and the bubbles to rise. You can use the scribe mark on the spigot (located
between the flange and transmitter) as a reference for the tine orientation. Always orient
the meter so the scribe mark is at either the 12 o’clock or 6 o’clock position.
The gap between the fork tines must always be vertical so that:
Installation Manual
Mounting
MMI-20020989 May 2019
Installation Manual 17
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