Nace CP 1, Course Manual

Page: 315 / 535

RP0285-2002
NACE International 11
6.4.4 For galvanic anode CP systems, the test station
design shall permit disconnection of the anodes to
correct potential measurements for IR drop to evaluate
the protection level.
When desired, the test station
should also accommodate test leads from buried
reference electrodes.
6.4.5 The test station should be clearly marked,
accessible, and installed so that it is protected from
vehicular traffic.
6.4.6 All lead wires to the test station shall be
protected from damage by either a minimum 0.5-m (18-
in.) burial depth or a nonmetallic conduit.
6.5 Wire and Connections
6.5.1 Wire used for anode, reference electrode, and
monitoring connections requires insulation with the
following qualities:
(a) low moisture absorption;
(b) resistance to tank product spills;
(c) abrasion resistance; and
(d) sufficient breaking strength for the application.
6.5.2 Anode lead wires shall have the wire/anode
interface connection secured by soldering or brazing.
Weld-on anodes shall have a weldable steel core for
connection directly to the structure. Wiring attached to
the structure should be connected by exothermic weld,
weldable steel pressure wire connectors, or appropriate
mechanical
connectors, and should be able to
withstand an acceptable pull test. The area of the
connection shall be cleaned by scraping or brushing
prior to attachment.
The connector and connection
area shall be thoroughly coated after attachment.
6.6 Miscellaneous
6.6.1 Design Drawings and Specifications
6.6.1.1 Drawings shall be prepared to show the
overall layout of the structures to be protected, the
CP system, and associated appurtenances.
6.6.1.2 Specifications shall be prepared for all
materials and installation practices that are used in
construction of the CP system.
6.6.2 Spill protection, overfill protection, release
detection, vapor recovery measures, and electrical
grounding or internal linings should be considered in
the design of the CP system for the UST system.
______________________________________________________________________________
Section 7: Installation of Cathodic Protection Systems
7.1 General
7.1.1 All work shall be performed in accordance with
all applicable health and safety regulations.
7.1.2 Notifications
7.1.2.1 Coordinating Committees in the area
(such
as Underground Corrosion Control
Coordinating Committees [UCCCs]
(7)
) and utility
operators should be notified prior to construction
and installation of the CP system(s).
7.1.2.2 Prior to excavation, public or private utility
owners, as well as owners of other underground
structures in the immediate vicinity, shall be
notified. This provides the owners of underground
structures with time to locate any structures within
the
proposed construction zone to avoid
accidental physical damage.
7.2 Site Conditions
7.2.1 Pertinent as-built construction drawings from the
UST installation shall be reviewed prior to construction.
Although the location of most USTs can be determined,
the location of product piping, vapor recovery lines, and
vent lines can be difficult to determine.
The
underground structures at the facility include not only
the USTs
and associated piping, but also the
monitoring wells and sensors, tank pit liners, and
utilities that may be present.
7.2.2 Prior to installation of the CP system, certain
factors such as water table, vehicular and pedestrian
traffic,
and aboveground structures shall be
considered.
7.3 Installation Procedures
7.3.1 Although most installations do not normally
disrupt operations, installation shall be coordinated with
appropriate operations personnel to minimize any
disruption of services.
This work should also be
coordinated with any other construction at the facility.
___________________________
(7)
The NACE International Technical Activities Division may be contacted to determine whether a UCCC is registered in the area; Call +1
281/228-6200, or e-mail tcc@mail.nace.org.