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NB/T 47013.14-2016 (NB/T47013.14-2016)

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NB/T 47013.14-2016: PDF in English (NBT 47013.14-2016)

NB/T 47013.14-2016
ICS 77.040.20
J 26
Nondestructive testing of pressure equipment -
Part 14. X-ray computed radiographic testing
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 ... 9
5 Testing technology and its selection ... 14
6 Testing result evaluation and quality grading ... 30
7 Testing records and reports ... 31
Annex A (informative) Test method for minimum grey value ... 33
Annex B (normative) Determination of spatial resolution ... 35
Annex C (normative) Determination of normalized signal-to-noise ratio ... 38
This Standard, NB/T 47013 “Nondestructive testing of pressure equipment”, consists
of the following 14 parts.
- Part 1. General requirements;
- Part 2. Radiographic testing;
- Part 3. Ultrasound 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;
- Part 14. X-ray computed radiographic testing.
This Part is Part 14 of NB/T 47013. X-ray computed radiographic testing.
This Part is drafted according to the rules given in GB/T 1.1-2009 “Directives for
standardization - Part 1. The structure and drafting of standards”.
This Part is proposed by and shall be under the jurisdiction of China Standardization
Technical Committee National on Boilers and Pressure Vessels (SAC/TC 262).
Drafting organizations of this Part. China Special Equipment Inspection and Research
Institute, Special Equipment Safety Supervision and Inspection Institute of Jiangsu
Province, China Nuclear Power Engineering Co., Ltd., Fong’s National Engineering
(Shenzhen) Co., Ltd., Shanghai Crown Domain Testing Technology Co., Ltd., De Hua
Materials Testing Co., Ltd., Emerson Process Management Flow Technologies Co.,
Ltd., Beijing Hangxing Technology Development Co., Ltd., General Electric Inspection
Nondestructive testing of pressure equipment
- Part 14. X-ray computed radiographic testing
1 Scope
1.1 This Part of NB/T 47013 specifies the technical and quality grading requirements
for fusion-welded joints of pressure-bearing metal parts of pressure equipment using
X-ray computed radiographic testing below 450 kV (hereinafter referred to as “CR
1.2 This Part applies to the CR testing for fusion-welded joints of steel, copper and
copper alloys, aluminum and aluminum alloys, titanium and titanium alloys, nickel and
nickel alloys. The type of welded joints is butt joint weld (hereinafter referred to as “butt
weld”) of a plate or tube.
1.3 The CR testing for the welded joints of other materials, supports and structural
parts of pressure equipment may refer to this Part.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the dated edition cited applies. For undated
references, the latest edition of the referenced document (including all amendments)
GB 11533 Standard for logarithmic visual acuity charts
GB/T 12604.2 Non-destructive testing - Terminology - Terms used in radiographic
GB 18871 Basic standards for protection against ionizing radiation and for the
safety of radiation sources
GB/T 21356 Non-destructive testing - Qualification and long-term stability of
computed radiology systems
GB/T 23901.5 Non-destructive testing - Image quality of radiographs - Part 5. Image
quality indicators (duplex wire type) - Determination of image unsharpness value
GBZ117 Radiological Protection Standards for Industrial X-ray Detection
The quality certificate of the IP shall include at least the main performance parameters
such as type and specification, dynamic range, excitation response time, chemical
composition of IP. Users shall use and store (IP) at the manufacturer's recommended
temperature and humidity conditions and avoid unnecessary exposure. For workpiece
under test with smaller thickness, it shall choose IP with slower photographic speed;
For workpiece under test with larger thickness, it may choose IP with faster
photographic speed. Scanner
The quality certificate of the laser scanner shall include at least the main performance
parameters such as specification, scanning size, input voltage, scanning resolution,
laser beam focal spot size and scanning step speed, and the functions and
performances of the laser scanner shall meet at least the following requirements.
a) the scanner shall have scanning and erasing functions. The grey value of residual
latent image after erasing shall not be higher than 5 % of the maximum grey
value of the system;
b) the scanning laser power shall meet the requirements of signal acquisition;
c) the PMT voltage or gain, scanning resolution of the scanner shall be adjustable;
d) the laser beam shall be free from chatter and free from artifacts and missing scan
lines. Display
The following minimum requirements shall be met.
a) the minimum brightness is 250 cd/m2;
b) the display is at least of 256 grey level;
c) the minimum light intensity ratio is 1. 250;
d) display at least 1M pixels, and the pixel size is less than 0.3 mm. System-specific software
It shall include at least the following functions.
a) measurement functions. including grey level measurement, spatial resolution
measurement, signal-to-noise ratio measurement, geometric dimension
measurement, etc.;
b) adjustment functions. including grey level transformation, contrast adjustment,
4.3.5 In the CR testing of pressure equipment, if some conditions of testing cannot
meet the requirements of AB-level testing technology, it is agreed by both parties to
the contract that under the premise of taking effective compensation measures (such
as increasing the exposure or selecting a system with higher signal-to-noise ratio), A-
level testing technology may be used, but it shall also use other non-destructive testing
methods for supplementary testing.
4.4 Testing process documents
4.4.1 Test process documents include process instructions and operating instructions.
4.4.2 In addition to meeting the requirements of NB/T 47013.1, the process
specification shall also specify the specific scope or requirements of the following
relevant factors. If the relevant factors change beyond the provisions, the process
specification shall be redeveloped or revised.
a) applicable structure, material type and thickness;
b) ray source energy range and focus size;
c) testing technology level;
d) trans-illumination method;
e) type and model of IP;
f) model of wire-type image quality indicator and duplex-wire-type image quality
g) type and thickness of metal screen;
h) model and parameter settings of scanner;
i) digital image display.
4.4.3 The operating instructions shall be developed according to the contents of the
process specification and the testing requirements of the tested workpieces. The
content of the operating instructions shall, in addition to meeting the requirements of
NB/T 47013.1, at least include.
a) testing equipment. ray source (focus size), IP, metal screen (type and thickness),
image quality indicator (type and model), backscatter shield lead plate, mark,
scanner and observation equipment;
b) testing technology and process. testing technology, trans-il...
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.