Testing of pressure vessels

NDT methods generally used for ispection of pressure vessels.

Detection of surface defects

  • Visual testing (VT)
  • Eddy current testing (ET)
  • Magnetic particle testing (MT)

Detection of internal defects

  • Ultrasonic testing (UT)
  • Radiographic testing (RT)


minimum maximum units
Outside Diameter *) 120 406 mm
Length *) 400 1700 mm
Wall Thickness (cylindrical part) *) 3.0 12 mm
Overlap 10 %

*) These parameters are subject of agreement with a customer.

Parameters of ultrasonic testing equipment

  • Multi-channel ultrasonic system
  • Testing frequency range 2 to 15 MHz
  • Testing sensitivity from 1 mm FBH
  • Automatic visual/acoustic signalization of test results for line control ??“ sorting device
  • 5 transducers combined in each one testing head
  • Simultaneous operation with 2 to 5 testing heads in one equipment



Configuration of ultrasonic transducers in testing head


Testing line assembly


First equipment for off-line UT of small pressure vessels


Reference piece pressure vessel with defined artificial defects


Pressure vessel ultrasonic testing in progress


Testing line in Poland (MILMET)


Testing line in Poland (MILMET)

testing-pressure-vessels-12 testing-pressure-vessels-13 testing-pressure-vessels-14


A-Scan – longitudinal notch in reference piece


A-Scan – thickness measurement


Database of ultrasonic testing


Examples of settings

Advantages of automated ultrasonic testing equipment for pressure vessels

  • Ultrasonic testing system is equipped with modern computer technique, enabling fully automatic operation without presence of operator;
  • Automatic manipulation with pressure vessels;
  • Short time for testing of one pressure vessel;
  • Simple control and adjustment of the system via user friendly software;
  • Possibility of remote system diagnostics;
  • Immediate information/signalization about rejected and good vessels;
  • Immediate documenting and archiving of test results, including data transfer to company’s central information system;
  • Generating test reports for separate vessels and/or for whole order;
  • Statistic data processing based on chosen criteria;
  • Parameters and functions of test are saved on HD.