NB/T 47013.13-2015 PDF in English
NB/T 47013.13-2015 (NB/T47013.13-2015, NBT 47013.13-2015, NBT47013.13-2015)
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Nondestructive testing of pressure equipments - Part 13: Pulsed eddy current testing
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Standards related to (historical): NB/T 47013.13-2015
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NB/T 47013.13-2015: PDF in English (NBT 47013.13-2015) NB/T 47013.13-2015
NB
ENERGY INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 77.040.20
H 26
Nondestructive testing of pressure equipment –
Part 13. Pulsed eddy current testing
ISSUED ON. APRIL 2, 2015
IMPLEMENTED ON. SEPTEMBER 1, 2015
Issued by. National Energy Administration
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 General requirements ... 6
5 Testing procedures ... 13
6 Evaluation and processing of test results ... 15
7 Testing records and reports ... 16
Annex A (Informative) Recommended test point calibration examples ... 17
Annex B (Informative) Recommended partial test results correction
relationship ... 18
Foreword
This Standard NB/T 47013 Nondestructive testing of pressure equipment
consists of the following 13 parts.
- Part 1. General requirements;
- Part 2. Radiographic testing;
- Part 3. Ultrasonic testing;
- Part 4. Magnetic particle testing;
- Part 5. Penetrant testing;
- Part 6. Eddy Current Testing;
- Part 7. Visual examination;
- Part 8. Leak Testing;
- Part 9. Acoustic emission testing;
- Part 10. Ultrasonic Time of Flight Diffraction Technique;
- Part 11. Standard practice for X-ray digital radiography;
- Part 12. Magnetic flux leakage testing;
- Part 13. Pulsed eddy current testing.
This Part is the 13th part of NB/T 47013. Pulsed eddy current testing.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009.
Attention is drawn to the possibility that some of the elements of this Standard
may be the subject of patent rights. The issuing authority shall not be held
responsible for identifying any or all such patent rights.
This Part was proposed by and shall be under the jurisdiction of National
Technical Committee on Refractory Furnace Container of Standardization
Administration of China (SAC/TC 262).
The drafting organizations of this Part. China Advanced Institute for Research
and Development, Huazhong University of Technology, Hefei Commuter
Machinery Research Institute, Ai De Forest (Xiamen) Electronic Co., Ltd.,
Jiangxi Institute of Boiler and Pressure Vessel Inspection, Nanjing Municipal
Waste Container Research Center, Guangdong Special Equipment
Nondestructive testing of pressure equipment –
Part 13. Pulsed eddy current testing
1 Scope
1.1 This Part of NB/T 47013 specifies the inspection methods and
evaluation rules for even wall thickness reduction of magnetic materials such
as carbon steel, low alloy steel used for in-use pressure equipment due to
corruption, erosion or mechanical damage, without excluding the cover layer.
1.2 This Part is applicable to the inspection of the substrate base material
wall thickness reduction of pressure equipment with cover layer and with the
following conditions.
a) the metal protective layer thickness is not greater than 1 mm;
b) for stainless steel or aluminium protective layer, the cover layer
thickness is not greater than 200 mm; for iron protective layer, the cover
layer thickness is not greater than 100 mm;
c) base material thickness range is 3 mm ~ 70 mm;
d) tube or pipe fitting diameter is not less than 50 mm;
e) base material temperature range is -196°C ~ 500°C.
1.3 The inspection of in-use pressure equipment without cover layer can
refer to this Part.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including
any amendments) applies.
GB/T 12604.6, Non-destructive testing - Terminology - Terms used in eddy
current testing
GB/T 28705-2012, Non-destructive testing - Test method for pulsed eddy
current testing
4.2.2 Testing instrument
The testing instrument shall have the functions of pulsed eddy current signal
excitation, data acquisition, data processing, signal waveform display,
analysis and storage; and shall at least meet the following requirements.
a) the frequency of the excitation signal is adjustable and the falling edge is
not more than 3 ms;
b) the number of data acquisition hardware shall not be less than 16 bits,
and shall have synchronization function with signal excitation. For the
selected probe, when the reference value is set within the valid testing
range, the testing signal curve shall have a bending point;
c) it shall have a double logarithmic display function, while displaying the
reference signal and testing signal; with the waveform partial
amplification function;
d) the relative wall thickness of the workpiece to be tested shall be given as
a percentage;
e) it shall be able to continuously store more than 100 testing points of the
relative wall thickness and the corresponding testing signal waveform of
the original data;
f) it can be used in -5°C ~ 40°C environment, with on-site dust, vibration
and other properties.
4.2.3 Testing probe
a) it shall give the material, wall thickness, minimum diameter, cover
material and thickness, protective layer material and thickness and other
performance parameters applicable to test workpiece for each probe;
b) the probe shall be set with testing and overheat instructions;
c) in the case of ensuring the overall system function, sensitivity and
accuracy, the extension cable can be used to connect the probe and the
instrument host;
d) according to the coil placement, it can be divided into flat (vertical
magnetic field) and vertical (parallel magnetic field); according to the
excitation method, it can be divided into focus and non-focus.
4.2.4 Battery
The continuous power supply time of the battery shall not be less than 4h.
indicates that the instrument is normal.
4.2.7.3 During on-site testing, if the test results of the equipment are
suspected, it shall check and adjust the equipment functions and record the
results of each maintenance.
4.3 Testing process documentation
4.3.1 The testing process documentation includes process procedures and
instructions on operation.
4.3.2 In addition to the requirements of NB/T 47013.1, the process
procedures shall also at least contain.
a) environmental investigation requirements for testing product;
b) basic information and operation status of testing product;
c) requirements for system verification;
d) reference point selection and actual measurement requirements;
e) requirements for testing initial data record;
f) requirements for data analysis;
g) processing provisions on test results.
4.3.3 The procedures shall also specify the specific scope or requirement of
the relevant factors listed in 4.3.3.1. If the relevant factors change goes
beyond the provisions, it shall re-prepare or revise the process specifications.
4.3.3.1 The relevant factors involved in the process.
a) product range (workpiece shape, specifications, material, wall thickness,
cover layer, etc.);
b) reference norms and standards;
c) testing equipment and apparatus, as well as calibration, verification,
operation verification or inspection requirements;
d) testing process (probe configuration, testing methods, etc.);
e) pre-testing surface preparation requirements;
f) reference area;
g) analysis and interpretation of testing data.
difference between the physical properties or operating conditions, the test
results shall tend to have a certain deviation.
4.3.4 The preparation of operating instructions shall be based on the
contents of the process and the workpiece inspection requirements. In
addition to the requirements of NB/T 47013.1, its contents shall at least
contain.
a) testing object. design and operating parameters, cover layer type and
thickness, metal surface temperature, environmental conditions and
equipment vibration, temperature fluctuations, etc.;
b) testing equipment and apparatus. probe, signal line, preamplifier, cable,
instrument host, test data acquisition and analysis software and
calibration specimen, non-conductive pad, metal sheet, etc.;
c) calibration specimen;
d) system verification;
e) excitation field type;
f) reference point selection and actual measurement;
g) provisions on testing initial data record;
h) determination of testing results.
4.3.5 The instruction manual shall be validated for the first time. The
verification method can use comparison test block, simulated test block or the
actual testing object.
4.4 Safety requirements
This Part does not fully list all the safety requirements for testing. Users who
use this Part are obliged to establish appropriate safety and health guidelines
prior to testing. The basic safety requirements in the testing process are as
follows.
a) inspection personnel shall comply with the on-site safety requirements,
wear protective clothing and protective equipment as required;
b) during online inspection, it shall pay attention to the temperature status
of the test workpiece so as to protect the personnel and the probe, the
cable from burning or f...
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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