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Pipes’ chamfer testing for detection of detachments

MPI equipment for testing pipes’ chamfer to detect detachments. Standards of American Petroleum Institute (API) prescribe NDT of front chamfer of transversally welded pipes of petroleum assortment to detect detachments.

Defects is possible to detect by using wet magnetic particle fluorescent method, when end parts of the pipe are magnetized by core, fluorescent suspension is applied and the surface is inspected under UV illumination.

PTS Josef Solnař, s.r.o. company developed and produced semiautomatic MPI equipment which makes it possible to magnetize pipe ends during their rotation around the axis with simultaneous application of fluorescent suspension on the tested surface. Testing personnel perform testing in the closed cabine, which prevents penetration of sunlight, inspecting the tested pipe surface of chamfer part to detect flaws of detachment type under powerful ultraviolet illumination. Upon completion testing the equipment automatically demagnetizes pipes’ ends.

On the pictures below you can see installed line for pipe control at one of pipe plants in Ukraine where two sets of MPI equipment (for testing both ends of pipes) are used; appearance of control and pipe magnetization mechanics, watering device. There is 400 W UV lamp above the equipment, it is also produced by our company. Control panel allows to set automatic testing mode as well as manual control mode for simple functions.

MPI equipment consists of the following main parts:

  • main electric board
      is intended to switch on/off the equipment and its main parts, to set and control magnetizing current value, to adjust time of magnetization and watering the pipe
  • magnetizing circuit
      circuit is intended for magnetization of chamfer part of a pipe by AC magnetic field and consists of magnetizing coil and polepieces
  • bench
      with a magnet mounted on it is intended for mechanical orientation of a magnet relative to a pipe with the help of manipulation equipment with electric drive for lifting and lowering of the bench according to diameter of the tested pipes and electropneumatic drive for moving the bench to the left, to the right and to lift a magnet
  • suspension preparation system
      is intended to supply magnetic suspension to the testing place and includes watering device, pump and reservoir of 40 l volume
  • control panel
      controls all technological operations and indicates working modes
  • UV illumination
      with the help of stationary UV lamp (400 W, λ = 365µm) and handheld UV lamp (100 W, λ = 365µm) is needed for illumination of the tested pipe surfaces




  • power supply: 3x 380 (400) V 50 Hz
  • power supply of operative circuits: 24 V AC
  • power consumption: 10 kVA
  • pneumatic power: compressed air system with pressure 6 bar min.
  • amount of current in magnetizing circuit: max. 10 A
  • working mode: manual, automatic
  • load factor of coil: 30%
  • main dimensions:
  main electric board 1600 x 305 x 800mm
  magnetizing circuit 150x300x300
  bench 1000x900x1100
  • suspension preparation and circulation system 1100x700x700
  • control panel 140 x 220 x 440mm
  • UV illumination 360x300x310
  • weight: circa 800kg


The equipment was manufactured and supplied to customer in Ukraine within 33 weeks in a high-quality condition that was proved by reaching all required testing parameters.
mpi ukosu1
Control panel, bench, magnet
Main electric board
Equipment assembling


mpi ukosu2
Equipment set in testing cabine
mpi ukosu3
Pipe testing
Magnetic particle inspection line
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Address: PTS Josef Solnař s.r.o.
  U Hrůbků 170
  709 00 Ostrava Nová Ves
  Czech Republic
Phone: +420 596 744 163-164
Mobile: +420 777 175 174