Nace CP 1, Руководство по эксплуатации

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RP0285-2002
NACE International 13
(a) design criteria;
(b) locations of CP equipment;
(c) types of test facilities;
(d) types of CP installed; and
(e) proximity of foreign structures.
7.4.2 Prior to energizing any impressed current CP
system, notification shall be given to operators of
nearby utilities and pipelines.
7.4.3 Prior to energizing the CP systems, data and
information shall be collected to provide an initial base
line of items such as:
(a) tank-to-soil potentials;
(b) pipe-to-soil potentials;
(c) dielectric isolation, if present;
(d) foreign structure-to-soil potentials;
(e) test coupons, if present; and
(f)
permanent reference electrodes, if present.
7.4.4 Verification of the following details regarding CP
devices and hardware shall be made prior to energizing
the system:
(a) location of anodes;
(b) ratings of impressed current sources;
(c) location of test facilities; and
(d) location of CP system negatives.
7.4.5 All initial base line data shall be documented and
the records maintained for the life of the system. Any
deviations from the design or as-built documentation
shall be noted and included with the initial base line
data.
7.4.6 Current Adjustment
7.4.6.1 The exact operating level of CP systems
is determined by a series of tests at various
operating levels.
The specific operating level
depends on the criterion for CP used for the UST
system (see Section 5).
7.4.6.2 When adjusting the operating levels of CP
systems, it is necessary to consider stray current
effects on adjacent structures such as:
(a) piping separated from the tank(s) or high-
resistance fittings (e.g., threaded joints);
(b) buried electric facilities;
(c) buried fire protection piping;
(d) buried water piping;
(e) other adjacent tank systems; and
(f)
municipal or utility structures serving the
facility at which the tank(s) is (are) located.
7.4.7 Testing
7.4.7.1 The final operating levels of CP systems
shall be established to achieve the appropriate CP
criterion (see Section 5).
7.4.7.2 Documentation of all operating para-
meters, such as initial base line data, as-built
drawings, operating currents, locations of test
facilities, key monitoring locations, equipment
manuals, and ground water level, shall be done
after the system is energized.
7.4.7.3 All appropriate electrical parameters shall
be recorded and documented for future reference.
7.5 Records
7.5.1 Tank system information shall include the
following:
(a) dimension and capacity;
(b) layout of pipe system;
(c) date of installation;
(d) type of excavation and installation details;
(e) history of tank system performance and repairs;
(f)
history of previous corrosion system and per-
formance; and
(g) stored product.
7.5.2 Complete information about the design and
installation of CP systems shall include:
(a) power source capacity;
(b) number and location of anodes;
(c) anode material and design life;
(d) anode installation details;
(e) type,
quantity, and location of permanent
reference electrodes;
(f)
date of energizing and initial current and voltage;
(g) structure-to-soil potential measurements;
(h) results of continuity testing for all components
listed in Paragraph 6.3.2;
(i)
approved as-built drawings for final CP system
design; and
(j)
approved final commission report.
______________________________________________________________________
Section 8: Operation and Maintenance
8.1 General: This section recommends procedures and
practices for maintaining continuous, effective, and efficient
operation of CP systems on USTs.
8.1.1 Electrical measurements and inspection are
necessary to determine that protection has been
established according to applicable criteria and that
each part of the CP system is operating properly.