NEN EN 14127 : 2011

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Measurement modes
5 General requirements
   5.1 Instruments
   5.2 Probes
   5.3 Couplant
   5.4 Reference blocks
   5.5 Test objects
   5.6 Qualification of personnel
6 Application of the technique
   6.1 Surface conditions and surface preparation
   6.2 Technique
        6.2.1 General
        6.2.2 Measurement during manufacture
        6.2.3 In-service measurement of residual wall thickness
   6.3 Selection of probe
   6.4 Selection of instrument
   6.5 Materials different from the reference
   6.6 Special measuring conditions
        6.6.1 General
        6.6.2 Measurements at temperatures below 0 degrees C
        6.6.3 Measurements at elevated temperatures
        6.6.4 Hazardous atmospheres
7 Instrument setting
   7.1 General
   7.2 Methods
        7.2.1 General
        7.2.2 Digital thickness instruments
        7.2.3 A-scan Instruments
   7.3 Check of settings
8 Influence on accuracy
   8.1 Operational conditions
        8.1.1 Surface conditions
        8.1.2 Surface temperature
        8.1.3 Metallic coating
        8.1.4 Non-metallic coating
        8.1.5 Geometry
   8.2 Equipment
        8.2.1 Resolution
        8.2.2 Range
   8.3 Evaluation of accuracy
        8.3.1 General
        8.3.2 Influencing parameters
        8.3.3 Method of calculation
9 Influence of materials
   9.1 General
   9.2 Inhomogeneity
   9.3 Anisotropy
   9.4 Attenuation
   9.5 Surface conditions
        9.5.1 General
        9.5.2 Contact surface
        9.5.3 Reflecting surface
        9.5.4 Corrosion and erosion
10 Test report
   10.1 General
   10.2 General information
   10.3 Inspection data
Annex A (informative) Corrosion in vessels and piping
      A.1 General
      A.2 Measurement of general corrosion
          A.2.1 Instrument
          A.2.2 Probes
          A.2.3 Setting of the instrument
          A.2.4 Measuring
      A.3 Measurement of corrosion with pitting
          A.3.1 Instrument
          A.3.2 Probes
          A.3.3 Setting of the instrument
          A.3.4 Measuring
Annex B (informative) Instrument settings
Annex C (informative) Parameters influencing accuracy
      C.1 Parameters influencing accuracy
      C.2 Methods of calculation
Annex D (informative) Measuring technique selection

Defines the principles for ultrasonic thickness measurement of metallic and non-metallic materials by direct contact, based on measurement of time-of-flight of ultrasonic pulses only.