Mechanical Installation 7828 Density Transmitter Technical Manual
2-10 78285000_AB
2.3.3 FREE STREAM INSTALLATION - WELDOLET
This is the preferred option where temperature variations are a critical factor. The
reduced thermal mass of the weldolet's taper-lock fitting renders it more able to track
rapid changes in temperature.
Conditions:
Flow: 0.3 to 0.5m/s (at the transducer)
Viscosity limit: Up to 20 000cP
Temperature: -50°C to 200°C
The weldolet has a 1.5" taper lock fitting, and is supplied to be welded on 4", 6", 8" or 10"
pipelines. Use of the weldolet ensures that the tines of the 7828 are orientated correctly
and are fully inserted into the fluid stream.
Before fitting the weldolet, the pipeline must be bored through at 52.5mm diameter to
accept the viscometer. The weldolet must be welded to the pipeline concentrically with the
pre-bored hole.
The view shown below is schematic to show the relevant dimensions.
52.5mm
min
254mm
Horizontal: 4” or larger
Vertical: 6” or larger
Weld
111mm
Free stream: 1.5” Swagelok fitting
Free stream weldolet
to suit pipe diameter
(4, 6, 8 or 10” N.B.)
The installation will conform generally to Schedule 40 pressure ratings. The weldolet
fabrication is rated to 100 Bar at ambient temperature.
Note: Correct installation and pressure testing of the fitting is the responsibility of
the user.
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