Site Considerations for Equipment Installation, Grounding, and Wiring Manual
D301452X012
September 2019
Grounding and Isolation 15
▪
All conductive tubing that runs between the pipeline and mounting valve manifold and/or the
unit’s multivariable pressure transducer.
▪
All conductive connections or tubing runs between the flow computer and turbine meter,
pulse transducer, or any other device that is mounted on the pipeline.
▪
Any Temperature Transducer, Pressure Transmitter, etc. and their mount/interface to the
pipeline.
Figure 3-9: Direct Mount Installation (with Cathodic Protection)
The ground conductor connects the ground lug and a known good earth ground. If present,
connect the cases of temperature transducers or pressure transmitters to the known good earth
ground. If the mounting 2-inch pipe is in continuity with the pipeline, it must be electrically isolated
from the flow computer. Use a strong heat-shrink material (such as Raychem
®
WCSM 68/22 EU
3140). This black tubing easily slips over the 2-inch pipe and then after uniform heating (as with a
rose-bud torch) it electrically insulates and increases the strength of the pipe stand.
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