Non-Conductive Or Insulated Pipeline; Figure 2-8. Outline Dimensions, Grounding Rings - ABB MINI-MAG 10D1475 Series Instruction Manual

10D1475 MINI-MAG MAGNETIC FLOWMETER INSTRUCTION MANUAL

2.4.3 Non-Conductive or Insulated Pipeline

For the Magnetic Flowmeter mounted in a non-conductive or liquid insulated pipeline (such as totally
plastic pipe, ceramic lined iron pipe, or cast pipe with internal bitumastic coating), perform the
grounding procedure outlined below. Refer to Figures 2-8 and 2-9 to supplement this discussion.
1. Grounding rings are required if the
meter is installed in non-conductive or
insulated pipe. If grounding rings and
gaskets were not specified at the time
the meter was ordered, they can be
ordered from Tables 6-1 and 6-2.
Grounding rings are available in vari-
ous corrosion resistant materials and
should be selected to be compatible
with the process liquid. When installed,
these rings are centered by the flange
bolts and therefore must be selected
according to the flange rating.
2. When installing the meter in the
pipeline, place a grounding ring at both
the inlet and outlet connections of the
Magnetic Flowmeter. Provide standard
gasketing between the face of the me-
ter liner and the grounding ring and the
adjacent pipe flange; i.e., four gaskets
required. Position the grounding rings
i n t he pi pe li ne s o t ha t t he meter
grounding straps (2) attached to the
meter ground post will easily reach the
ground strap connection bolt on the re-
spective grounding ring.
3. Clamp the free end of the two bond-
ing straps (shortest strap to down-
s t r e a m g r o u n d i n g r i n g ) t o t h e
applicable grounding ring; using hex
head bolt and external tooth lock-
washer (supplied with the grounding
rings when rings are ordered from the
manufacturer).
4. The user must supply a sufficient
length of grounding wire for connecting
the meter grounding post (ring nut sup-
plied) to a good electrical ground.
Number 12 AWG, or heavier, copper
wire may be used for this grounding
wire.
2-12
FIGURE 2-8. OUTLINE DIMENSIONS,
GROUNDING RINGS *
* For applications other than ANSI Class 150,
contact the manufacturer.
INSTALLATION