Installing C.P. Components 8:9
CP 1 – Cathodic Protection Tester Course Manual
© NACE International, 2000
07/01/04
INSULATING WASHERS
STEEL STUD
STEEL WASHER
NUT
INSULATING SLEEVE
INSULATING GASKET
Figure 8.8 Isolating Flange
Other types of isolation devices include dielectric materials to maintain
separation between pipelines and casings. In some situations, structural
members are isolated from supports using sheet type dielectric material and
insulating sleeves and washers. A properly isolated casing is shown in Figure
8.9.
Vent Pipe
Casing Insulating Spacers
Insulating End-
Seal Secured to
Pipe and Casing
Dynamic
Load
Figure 8.9 Properly Isolated Casing
Service conditions can vary greatly on different systems. In selecting an
electrical isolating device, be certain that the materials of constructions meet
the service requirements, both from the standpoint of temperature and
mechanical properties.
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