The standard specifies five nondestructive testing methods and defects classification methods covering ray detection, ultrasonic detection, magnetic particle testing, penetration detection and eddy current testing.
All sorts of nondestructive testing methods specified in the standard are applicable to raw material, spare parts and welding seam of metallic pressure vessel.
Part 1 General Provisions
1 Subject and Aspects Covered
2 Normative References
3 Terms
3.1 A cluster of Defects
3.2 Loss of Back Reflection Caused by Defects BG/BF (dB)
3.3 Detection Cross Chapter
3.4 Tandem Reference Line
3.5 Reference Line
3.6 Horizontal Rectangle Tandem Scanning Detection
3.7 Longitudinal Rectangle Tandem Scanning Detection
4 General Requirements
4.1 Selection Principle
4.2 Detection Responsibility of Manufacturer
4.3 Detection Personnel
4.4 Responsibility of Nondestructive Testing Responsible Personality
4.5 Acceptance Stamp
Part 2 Welding Seam Radiation Trans-illumination Detection
5 General Requirements
5.1 Detection Range
5.2 Safety Protection
5.3 Detection Personnel
5.4 Radiation Trans-illumination Equivalent Coefficient
5.5 Trans-illumination Mode
5.6 Surface Requirement
5.7 Location Marking and Identification Marking
5.8 Image Quality Indicator
5.9 Radiation Transillumination Quality Grade
5.10 Film and Intensifying Screen
5.11 Geometrical Condition
5.12 Selection of Ray Energy
5.13 Shielding of Useless Radiation and Scattered Ray
5.14 Exposure
5.15 Film Treatment
5.16 Film Quality
5.17 Film Observation
5.18 Report and Acceptance Stamp
6 Welding Seam Radiation Transillumination Defect Grade Estimation
6.1 Transillumination Defect Grade Estimation for Steel Pressure Vessel Butt-jointed Seam
6.2 Steel Pipe Circumferential Seam Transillumination Defect Grade Estimation
6.3 Grade Estimation for Aluminium Pressure Tight Seam Transillumination Defect
6.4 Grade Estimation for Titanium Pressure Tight Seam Transillumination Defect
Part 3 Ultrasonic Detection
7 General Requirements
7.1 Detection Range
7.2 Detection Personnel
7.3 Defectoscope, Probe and System Performance
7.4 General Method of Ultrasonic Detection
7.5 Calibration
7.6 Test Block
7.7 Report and Acceptance Stamp
8 Ultrasonic Detection for Pressure Vessel Raw Material and Spare
8.1 Pressure Vessel Steel Plate Ultrasonic Detection
8.2 Ultrasonic Detection for Pressure Vessel Forgings
8.3 Ultrasonic Detection for Pressure Vessel Clad Steel Plate
8.4 Ultrasonic Detection for Steel High Pressure Seamless Pipe
8.5 Ultrasonic Detection for High-voltage Screw Bolt
8.6 Ultrasonic Detection for Pressure Vessel Austenitic Steel Forging
9 Ultrasonic Detection for Pressure Vessel Welding Seam
9.1 Ultrasonic Detection for Steel Pressure Vessel Welding Seam
9.2 Ultrasonic Detection for Stainless Steel Overlay
9.3 Ultrasonic Detection for Aluminum Pressure Vessel Welding Seam
10 Ultrasonic Measurements for Pressure Vessel Thickness
10.1 Measurement Range
10.2 Acoustic Speed Scope of Primary Materials
10.3 Instrument and Probe
10.4 Adjustment Test Block
10.5 Couplant
10.6 Instrumental Correction
10.7 Measurement Preparation
10.8 Measuring Method
10.9 Disposal to Abnormity of Measured Value
10.10 Report
Part 4 Surface Detection
11 Magnetic Particle Testing
11.1 Detection Scope and General Requirement
11.2 Testing Personnel
11.3 Equipment and Magnetic Particle
11.4 Magnetization Method
11.5 Electric Current Mode and Selection
11.6 Surface Preparation
11.7 Measuring Occasion
11.8 Magnetization Specifications
11.9 Magnetic Particle Application
11.10 Demagnetization
11.11 Magnetic Mark Evaluation and Record
11.12 Rechecking
11.13 Defect Grade Estimation
11.14 Report
12 Penetrance Testing
12.1 Testing Scope and General Requirements
12.2 Detection Personnel
12.3 General Requirements
12.4 Classification and Selection of Penetrance Testing
12.5 Operating
12.6 Classification for Defect Displaying Marks
12.7 Defect Displaying Mark Grade Estimation
12.8 Report
13 Eddy Current Testing for Pipe workpiece
13.1 Detection Range and General Requirements
13.2 Testing Personnel
13.3 Testing Equipment
13.4 Standard Sample
13.5 Testing Condition and Procedure
13.6 Defect Grade Estimation
13.7 Report
Appendix A
Appendix B
Appendix C
Appendix D
Appendix E
Appendix F
Appendix G
Appendix H
Appendix I
Appendix J
Appendix K
Appendix L
Appendix M
Appendix N
Appendix O
Appendix P
Appendix Q
Appendix R
Additional Explanation
The standard specifies five nondestructive testing methods and defects classification methods covering ray detection, ultrasonic detection, magnetic particle testing, penetration detection and eddy current testing.
All sorts of nondestructive testing methods specified in the standard are applicable to raw material, spare parts and welding seam of metallic pressure vessel.
Contents of JB 4730-1994
Part 1 General Provisions
1 Subject and Aspects Covered
2 Normative References
3 Terms
3.1 A cluster of Defects
3.2 Loss of Back Reflection Caused by Defects BG/BF (dB)
3.3 Detection Cross Chapter
3.4 Tandem Reference Line
3.5 Reference Line
3.6 Horizontal Rectangle Tandem Scanning Detection
3.7 Longitudinal Rectangle Tandem Scanning Detection
4 General Requirements
4.1 Selection Principle
4.2 Detection Responsibility of Manufacturer
4.3 Detection Personnel
4.4 Responsibility of Nondestructive Testing Responsible Personality
4.5 Acceptance Stamp
Part 2 Welding Seam Radiation Trans-illumination Detection
5 General Requirements
5.1 Detection Range
5.2 Safety Protection
5.3 Detection Personnel
5.4 Radiation Trans-illumination Equivalent Coefficient
5.5 Trans-illumination Mode
5.6 Surface Requirement
5.7 Location Marking and Identification Marking
5.8 Image Quality Indicator
5.9 Radiation Transillumination Quality Grade
5.10 Film and Intensifying Screen
5.11 Geometrical Condition
5.12 Selection of Ray Energy
5.13 Shielding of Useless Radiation and Scattered Ray
5.14 Exposure
5.15 Film Treatment
5.16 Film Quality
5.17 Film Observation
5.18 Report and Acceptance Stamp
6 Welding Seam Radiation Transillumination Defect Grade Estimation
6.1 Transillumination Defect Grade Estimation for Steel Pressure Vessel Butt-jointed Seam
6.2 Steel Pipe Circumferential Seam Transillumination Defect Grade Estimation
6.3 Grade Estimation for Aluminium Pressure Tight Seam Transillumination Defect
6.4 Grade Estimation for Titanium Pressure Tight Seam Transillumination Defect
Part 3 Ultrasonic Detection
7 General Requirements
7.1 Detection Range
7.2 Detection Personnel
7.3 Defectoscope, Probe and System Performance
7.4 General Method of Ultrasonic Detection
7.5 Calibration
7.6 Test Block
7.7 Report and Acceptance Stamp
8 Ultrasonic Detection for Pressure Vessel Raw Material and Spare
8.1 Pressure Vessel Steel Plate Ultrasonic Detection
8.2 Ultrasonic Detection for Pressure Vessel Forgings
8.3 Ultrasonic Detection for Pressure Vessel Clad Steel Plate
8.4 Ultrasonic Detection for Steel High Pressure Seamless Pipe
8.5 Ultrasonic Detection for High-voltage Screw Bolt
8.6 Ultrasonic Detection for Pressure Vessel Austenitic Steel Forging
9 Ultrasonic Detection for Pressure Vessel Welding Seam
9.1 Ultrasonic Detection for Steel Pressure Vessel Welding Seam
9.2 Ultrasonic Detection for Stainless Steel Overlay
9.3 Ultrasonic Detection for Aluminum Pressure Vessel Welding Seam
10 Ultrasonic Measurements for Pressure Vessel Thickness
10.1 Measurement Range
10.2 Acoustic Speed Scope of Primary Materials
10.3 Instrument and Probe
10.4 Adjustment Test Block
10.5 Couplant
10.6 Instrumental Correction
10.7 Measurement Preparation
10.8 Measuring Method
10.9 Disposal to Abnormity of Measured Value
10.10 Report
Part 4 Surface Detection
11 Magnetic Particle Testing
11.1 Detection Scope and General Requirement
11.2 Testing Personnel
11.3 Equipment and Magnetic Particle
11.4 Magnetization Method
11.5 Electric Current Mode and Selection
11.6 Surface Preparation
11.7 Measuring Occasion
11.8 Magnetization Specifications
11.9 Magnetic Particle Application
11.10 Demagnetization
11.11 Magnetic Mark Evaluation and Record
11.12 Rechecking
11.13 Defect Grade Estimation
11.14 Report
12 Penetrance Testing
12.1 Testing Scope and General Requirements
12.2 Detection Personnel
12.3 General Requirements
12.4 Classification and Selection of Penetrance Testing
12.5 Operating
12.6 Classification for Defect Displaying Marks
12.7 Defect Displaying Mark Grade Estimation
12.8 Report
13 Eddy Current Testing for Pipe workpiece
13.1 Detection Range and General Requirements
13.2 Testing Personnel
13.3 Testing Equipment
13.4 Standard Sample
13.5 Testing Condition and Procedure
13.6 Defect Grade Estimation
13.7 Report
Appendix A
Appendix B
Appendix C
Appendix D
Appendix E
Appendix F
Appendix G
Appendix H
Appendix I
Appendix J
Appendix K
Appendix L
Appendix M
Appendix N
Appendix O
Appendix P
Appendix Q
Appendix R
Additional Explanation