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NB/T 47013.13-2015 English PDF (NBT47013.13-2015)

NB/T 47013.13-2015 English PDF (NBT47013.13-2015)

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NB/T 47013.13-2015: Nondestructive testing of pressure equipments - Part 13: Pulsed eddy current testing
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.
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...
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