TB/T 2340-2012 (TBT 2340-2012)

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TB/T 2340-2012
TB
RAILWAYS INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 45.120
S 23
Replacing TB/T 2340-2000, TB/T 2634-1995
Ultrasonic testing detector for rail
ISSUED ON. MARCH 01, 2012
IMPLEMENTED ON. JULY 01, 2012
Issued by. Ministry of Railways of the People's Republic of China
Table of Contents
1 Scope ... 6 
2 Normative references ... 6 
3 Terms and definitions ... 7 
4 Technical requirements ... 10 
4.1 General rules ... 10 
4.2 Probe ... 11 
4.2.1 General rules for probes ... 11 
4.2.2 Probe performance ... 12 
4.2.3 Operating ambient temperature ... 13 
4.3 Instruments ... 13 
4.3.1 Pulse repetition frequency ... 13 
4.3.2 Attenuator ... 14 
4.3.3 Dynamic range ... 14 
4.3.4 Amplifier frequency response ... 14 
4.3.5 Error of time base (horizontal) linearity ... 14 
4.3.6 Linearity of vertical display error ... 14 
4.3.7 Blocking range ... 14 
4.3.8 The effects of inhibition state on measuring results ... 14 
4.3.9 The effects of operation voltage on the wave height of detector echo
and the sensitivity of detection (alarm) ... 14 
4.3.10 Digital detector... 14 
4.4 Combination property ... 15 
4.4.1 Sensitivity margin ... 15 
4.4.2 Distance-amplitude characteristic ... 15 
4.4.3 Signal-to-noise ratio ... 15 
4.4.4 Defect detection capability ... 16 
4.5 Electromagnetic compatibility ... 16 
4.6 Operation ambient temperature ... 16 
4.7 Temperature stability ... 16 
4.8 Vibration performance ... 16 
4.9 Drop performance ... 16 
4.10 Sealing performance ... 16 
4.11 Safety performance ... 17 
5 Inspection methods ... 17 
5.1 Inspection conditions ... 17 
5.2 Probes ... 17 
5.2.1 Physical properties ... 17 
5.2.2 Echo frequency ... 17 
5.2.3 Relative error of echo frequency ... 18 
5.2.4 Refraction angle error ... 18 
5.2.5 Acoustic-axis offset angle ... 18 
5.2.6 Relative deviation of combined probe ... 19 
5.2.7 Attenuation value of protective boot (film) ... 19 
5.2.8 Resolution ... 19 
5.2.9 Sensitivity margin ... 20 
5.2.10 Width of acoustic-beam N ... 21 
5.2.11 Wedge echo amplitude ∆S ... 21 
5.2.12 Temperature applicability of working environment ... 22 
5.3 Instrument ... 22 
5.3.1 Pulse repetition frequency ... 22 
5.3.2 Attenuator ... 22 
5.3.3 Dynamic range ... 22 
5.3.4 Amplifier frequency response ... 22 
5.3.5 Time base (horizontal) linearity error ... 24 
5.3.6 Vertical linearity error ... 25 
5.3.7 Blocking range ... 25 
5.3.8 The influence of inhibitory state on the measurement results ... 25 
5.3.9 The influence of working voltage on the echo height of flaw-detector
and the flaw-detection (alarm) sensitivity ... 26 
5.3.10 Digital flaw-detector ... 26 
5.4 Comprehensive performance ... 28 
5.4.1 Sensitivity margin ... 28 
5.4.2 Distance amplitude characteristic ... 29 
5.4.3 Signal-to-noise ratio ... 29 
5.4.4 Flaw-detection capability ... 29 
5.5 Electromagnetic compatibility ... 30 
5.6 Ambient temperature test ... 30 
5.7 Temperature stability ... 30 
5.8 Vibration performance ... 30 
5.9 Drop performance ... 31 
5.10 Sealing performance ... 31 
5.11 Safety performance ... 31 
6 Inspection rules ... 31 
7 Mark, packaging, transportation, storage and accompanying documents ... 33 
7.1 Mark ... 33 
7.2 Packaging ... 33 
7.3 Transportation ... 33 
7.4 Storage ... 33 
7.5 Accompanying documents ... 33 
Annex A ...