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Installation and Configuration Manual 11
Installation (Short Stem)
Installation (Short Stem) Electrical ConnectionsInstallation (Long Stem)Introduction
The pocket geometry must be consistent with 2" schedule 40 tube in both internal diameter and
minimum wall thickness, such as:
• Internal diameter: 2" (52.5 mm)
• Wall thickness: minimum 0.15" (3.912 mm)
Weld neck or slip-on flanges may be used, according to the flange rating selected. However, for
higher rated flanges, only slip-on flanges may give the necessary clearances.
2.3.4 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 0.5 m/s (at the meter)
• Viscosity: 0.5 to 12,500 cP
• Temperature: -50 °C to 200 °C (–58 °F to 392 °F)
[-40 °C to 200 °C (-40 °F to 392 °F) in hazardous areas]
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 7827 meter are orientated correctly and are fully
inserted into the fluid stream.
Before fitting the weldolet, the pipeline must be bored through at 2.1" (52.5 mm) diameter to accept
the viscometer. The weldolet must be welded to the pipeline concentrically with the pre-bored hole.
The view shown below is a schematic to show the relevant dimensions.
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4” or larger;
horizontal
6” or larger;
vertical
2.75”
(70 mm ±2 mm)
7.75”
(197 mm)
Free Stream; flanged
2” (52.3 mm)
wall thickness
at least
0.15” (3.912 mm)
2” Schedule 40
4.37”
(111 mm)
0.47” (12 mm)
PTFE
ring
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PTFE
ring
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PFA
ring
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