PIPE SCANNER

AUTOMATIC RADIOLOGICAL MONITORING SYSTEM FOR PIPES

The system is designed to perform a complete and accurate scanning of both the internal and external surfaces of pipes, e.g coming from decommissioning of Nuclear Power Plants.

The measurement cycle is totally automatic, carried out by the PLC sequences, which are managed by the software installed on the host PC. The user interface of the management software allows the operator to set the input parameters, the measurement settings, and to start the automatic cycle by a simple command on the touch-screen display. The system status is shown both on the display and on the alarm beacon.

After loading the pipe the system runs a series of preliminary tests through optical devices: actual diameter and length measurement, and roughness check. When all the preliminary checks are carried out, the measurement cycle starts: the pipe is automatically divided in portions to be scanned by the detectors, according to its length, and for each section the system acquires the radiometric data. The system can also detect “hot spots” of contamination. At the end of the scanning a report is produced, with the reading of the surface contamination. Safety devices and a perimeter infrared barrier prevent any dangerous man/machine interaction.

The mechanical structure is composed by a rail line, on which are mounted two lodging stations for the pipes and the detection station.

 
The lodging stations are two robust support structures, manually movable on the railway; through the manual brakes installed on them, they can be fastened in a proper position along the railway, depending on the length of the pipe they have to sustain. In each support stations there is a pair of compass rollers: when the work cycle is started, they close and lift up the pipe and put it in rotation around its axis, at a proper speed depending on its diameter.

The plastic scintillators are installed by pairs in the tip of two poles, mounted on a support vertical column.

The detectors in the two poles face each other, in order to “see” both the pipe’s surfaces, internal and external; depending on the diameter, the poles are positioned at the upper or the lower side of the cylinder.

Moving the support station along the railway through PLC commands, the poles are inserted in the pipe allowing the scanning of each section of the surfaces.


Additional Info

  • Main features:
    • Detectors: two pairs of plastic scintillators (250x45x20 mm)
    • Detectors installed in two horizontal poles, scanning the internal and external surfaces of the pipe
    • Pole support movable along the vertical direction
    • Poles support truck movable along the railway toward the pipe and back to load position
    • Movable support stations: pipe lodging and rotation devices
    • Optical devices: determination of diameter and length of the pipe, as well as surface roughness check
    • Control panel: interaction between operator and system, parameters setting, automatic measurement cycle management
    • Safety devices preventing collisions between the movable parts of the system or damages to the structure and to the operators when the measurement cycle is activated
    • MDA (60Co): fino a 0.14 Bq/cm2 (1 min)
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