NB/T 47013.10-2015 PDF English
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NB/T 47013.10-2015: Nondestructive testing of pressure equipments - Part 10: Ultrasonic time of flight diffraction technique
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H 26
PROFESSIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Replacing JB/T 47013.10-2010
Nondestructive Testing of Pressure
Equipments - Part 10. Ultrasonic Time of
Flight Diffraction Technique
Issued on: APRIL 2, 2015
Implemented on: SEPTEMBER 1, 2015
Issued by the National Energy Administration of the People's Republic of
China
NB
Table of Contents
Foreword ... I
1 Scope ... 1
2 Normative References ... 2
3 Terminologies and Definitions ... 2
4 General Requirements ... 6
5 Selection and Setting of Testing Process Parameters ... 15
6 Testing ... 19
7 Analysis and Explanation of the Testing Data ... 21
8 Flaw Evaluation and Quality Classification ... 24
9 Testing Record and Report ... 26
Appendix A (Informative) Testing of Workpieces with Unequal Thickness ... 27
Appendix B (Normative) Requirements for Performance Indexes of TOFD Testing
Instrument and Probe ... 30
Appendix C (Informative) Measurement Method of the -12 dB Sound Beam Spread Angle
of Instrument and Probe Combination ... 32
Appendix D (Normative) Reference Blocks of Other Structure Types ... 33
Appendix E (Informative) Typical TOFD Images ... 36
Foreword
This Standard "Nondestructive Testing of Pressure Equipments" (NB/T 47013)
comprises 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 Testing;
- 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 Radioscopy;
- Part 12. Magnetic Flux Leakage Testing;
- Part 13. Pulsed Eddy Current Testing.
This Part is Part 10 of NB/T 47013. Ultrasonic Time of Flight Diffraction Technique.
This Part was drafted according to the rules given in "Directives for Standardization -
Part 1. Structure and Drafting of Standards" (GB/T 1.1-2009).
This Part supersedes "Nondestructive Testing of Pressure Equipments - Part10.
Ultrasonic Time of Flight Diffraction Technique" (NB/T 47013.10-2010); compared with
NB/T 47013.10-2010, this Part has the following main technical changes.
- The relevant content of the chapter "Scope" was modified;
- Normative references were modified;
- Terminologies and definitions were added;
- Sequence of parts of the chapters and sections was adjusted;
- Testing standards, testing requirements and testing parameters of testing instrument
and probe were specified;
- The quantity of reference blocks was reduced, and the requirements of reference
blocks given in the former standard were kept;
- The test blocks for height of scanning surface dead zone and spread angle of sound
beam were added;
- The use and operating requirements of simulating test block were adjusted;
- The requirements for calibration, checking, operation checking and inspection of
testing equipments and apparatuses were added;
- The requirements for the technical level of TOFD testing were added, and
suggestions on selection of testing methods for scanning surface dead zone, back
wall dead zone and transverse flaw were provided;
- Safety requirements were added;
- The requirements of testing area were modified;
- Part of content in "selection of scanning mode" was adjusted;
- The determination method of dead zone height was added;
- The requirements of "confirmation of overall setting of testing system" were added;
- Part of content in quality classification was modified;
- The requirements of testing records were added;
- Informative Appendix A - "Testing of Workpieces with Unequal Thickness" was
added;
- Informative Appendix C - "Measurement Method of the -12dB Sound Beam Spread
Angle of Instrument and Probe Combination" was added;
- Informative Appendix E - "Typical TOFD Images" was added.
This Part was proposed by and is under the jurisdiction of National Technical Committee
on Boilers and Pressure Vessels of Standardization Administration of China (SAC/TC 262).
Drafting organizations of this Part. China Special Equipment Inspection and Research
Institute, Hefei General Machinery Research Institute, Shanghai Morimatsu Pressure Vessel
Co., Ltd., Special Equipment Safety Supervision Inspection Institute of Jiangsu Province,
China First Heavy Industries Group Dalian Hydrogenation Reactor Manufacturing Co. Ltd.,
Guodian Science and Technology Research Institute and Huludao Special Equipment
Supervision and Inspection Institute of Liaoning Province.
Chief drafters of this Part. Zheng Hui, Yan Changzhou, Jiang Yanshan, Qiang Tianpeng,
Zhou Fengge, Yang Qi, Wang Xiaomei, Hu Xianlong and Tian Guoliang.
The previous edition of the standard superseded by this Part is as follows.
- NB/T 47013.10-2010.
Nondestructive Testing of Pressure Equipments -
Part 10. Ultrasonic Time of Flight Diffraction Technique
1 Scope
1.1 This Part of NB/T 47013 specifies the methods and quality classification requirements
of ultrasonic time of flight diffraction technique (hereinafter referred to as "TOFD") adopted
for pressure equipments.
1.2 This Part is applicable to such welded joints meeting the following conditions at the
same time.
a) The material is low carbon steel or low alloy steel;
b) Butt joint of full-penetration structure type;
c) Nominal thickness of workpiece, t. 12mm≤t≤400mm (excluding weld reinforcement;
when the base metal on both sides of weld is different, the nominal thickness of the
thinner side shall be taken).
1.3 As for the stainless steel-steel clad plate, titanium-steel clad plate, aluminum-steel clad
plate and nickel-steel clad plate used for such pressure equipments with the nominal thickness
of base metal (of low carbon steel or low alloy steel) greater than or equal to 12mm, TOFD
testing over the butt joint of base metal carried out from the side of base metal may refer to
this Part; if TOFD testing over the butt joint of base metal is carried out from the side of
cladding metal, it may also refer to this Part, but the area where ultrasonic sound beam may
pass through shall be tested with normal probe according to the requirements of NB/T
47013.3 and it shall be free from any unbonding with flat bottom hole equivalent diameter
greater than or equal to φ2mm.
1.4 As for the pressure equipments with the nominal thickness of base metal (of low carbon
steel or low alloy steel) greater than or equal to 12mm and with clad layer of austenitic
stainless steel, nickel alloy or other materials, the TOFD testing over the butt joint of base
metal carried out from the side of base metal may refer to this Part.
1.5 As for the support members and structural members relevant to pressure equipments, the
TOFD testing may refer to this Part; as for metallic materials with isotropic fine grain and low
acoustic attenuation, the TOFD testing may also refer to this Part, but the change of acoustic
characteristics shall be considered; as for the fillet joint of insertion type connection pipe, the
TOFD testing may refer to this Part when the testing conditions required in this Part are met.
1.6 When the nominal thickness of base metal on both sides of welded joint is unequal, the
testing may be carried out by making reference to Appendix A.
2 Normative References
The following documents for the application of this document are essential. Any dated
reference, just dated edition applies to this document. For undated references, the latest
edition (including any amendments) applies to this document.
GB/T 12604.1 Non-destructive Testing -Terminology - Terms Used in Ultrasonic
Testing
GB/T 27664.1 Non-destructive Testing - Characterization and Verification of
Ultrasonic Test Equipment - Part 1. Instruments
GB/T 27664.2 Non-destructive Testing - Characterization and Verification of
Ultrasonic Test Equipment - Part 2. Probes
NB/T 47013.1 Nondestructive Testing of Pressure Equipments-Part 1. General
Requirements
NB/T 47013.2 Nondestructive Testing of Pressure Equipments-Part 2. Radiographic
Testing
NB/T 47013.3 Nondestructive Testing of Pressure Equipments- Part 3. Ultrasonic
Testing
NB/T 47013.4 Nondestructive Testing of Pressure Equipments-Part 4. Magnetic
Particle Testing
NB/T 47013.5 Nondestructive Testing of Pressure Equipments-Part 5. Penetrant
Testing
NB/T 47013.6 Nondestructive Testing of Pressure Equipments-Part 6. Eddy Current
Testing
JB/T 8428 Non-destructive Testing - General Specification for Ultrasonic Test
Block
JB/T 9214 Non-destructive Testing - Test Methods for Evaluating Performance
Characteristics of A-scan Pulse-echo Ultrasonic Testing Systems
JB/T 10062 Testing Methods for Performance of Probes Used in Ultrasonic Flaw
Detection
3 Terminologies and Definitions
For the purpose of this Part, the terminologies and definitions defined in GB/T 12604.1
and NB/T 47013.1 as well as the following ones apply.
3.1
Coordinate definition
Define the meaning of the reference starting point O of testing and the meaning of
coordinates X, Y and Z, see Figure 1.
Note.
O - the set reference starting point of testing;
Y - the coordinate in the width direction of weld;
X - the coordinate in the length direction of weld;
Z - the coordinate in the thickness direction of weld.
Figure 1 Coordinate Definition
3.2
TOFD Time of flight diffraction
TOFD is a kind of ultrasonic testing method to detect and determine the flaw position
and size in a receiving-transmitting probe pair working mode by mainly utilizing the
diffracted wave signal at flaw end.
3.3
Scanning surface
The workpiece surface on which probe is placed to scan.
3.4
Back wall
The surface on the opposite side of the scanning surface of workpiece.
3.5
Later...
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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