2.5.3 Non-Conductive or Electrically Insulated Pipeline
If the flowmeter is included as part of a non-conductive or liquid insulated pipeline (such as totally
plastic pipe, ceramic lined iron pipe, or cast pipe with internal bitumastic coating), the following
grounding procedures apply. Refer to Figure 2-21 to supplement the following text.
1) For this service, the meter requires the use of grounding rings. The grounding rings
should be installed between the meter flanges and the mating flanges of the pipeline
as shown in Figure 2-21. A gasket is required on both sides of the grounding ring. If
the meter is supplied with a grounding ring/protector plate fastened to the meter
flange,only one gasket is required between the grounding ring/protector plate and the
pipeline flange. Proper gasket locations are shown in Figure 2-19.
NOTE
When using grounding rings and gaskets, add 1/8 inch per end (1/4 inch
total) to the overall meter installation length (dimension "L" in Figures
2-3 through 2-16) to allow for the added thickness of these items.
2) Attach the bonding wire and ground wire to the tab of the grounding ring. Use
internal tooth lockwashers and hex head nut and bolts as shown in Figure 2-21. The
ground wire should be #12 AWG, or heavier, copper wire.
Note that the flowmeter shown in this illustration is not the meter described in this
instruction bulletin.
FIGURE 2-20. GROUNDING PROCEDURE; CONDUCTIVE PIPELINE
Series 10DX3000 Magnetic Flowmeter Instruction Manual
2-25
