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Nondestructive testing and automation systems

Tested pipes

ParameterValue
Outside diameter 73.0–280.0 mm
Wall thickness 4.0–35.0 mm
Length 5,000–14,620 mm
Permissible ovality max. 0.45 %
Wall thickness tolerance in accordance with API and GOST standards
Overall straightness tolerance of the pipe body 1:2000 of pipe length
Straightness tolerance of pipe ends (1100 mm section) 1:1000 of pipe length

Testing parameters

ParameterValue
Testing methods pulse-echo method
back-wall echo attenuation (mirror-shadow) method
multiple back-wall echo attenuation method
combinations thereof
Operating frequency range (longitudinal and transverse defect testing system) 2.5–5.0 MHz
Testing sensitivity (longitudinal and transverse defect testing system) through hole 1.6 mm in diameter
notch with a depth of 5 % of wall thickness
Sensitivity margin in the testing zone – signal-to-noise ratio (longitudinal defect testing system) at least 24 dB
Permissible wall thickness measurement error ±0.05 mm