Test methods

Types of monitoring and control – using UT, VT methods:

1. Ultrasonic testing – UT

 

A conventional ultrasound method – UT (UT-Conventional), TOFD contemporary ultrasonic method (UT-TOFD), Phased Array (UT-PA): These methods use ultra-sound waves (longitudinal, lateral, superficial, etc.) for detection and sizing of internal and surface imperfections in the rolled iron, welds, etc. (cracks, lack of fusion for making alloys, slag inclusions, gas pores, stratification and non-metallic inclusions and general external and internal corrosion).

The Guide Wave Method is used for fast diagnosis of corrosion and other defects in long stretches of underground and on-ground pipelines, risers, pipes with an insulation coating.

Calibration, settings and the imperfections found on-site are recorded and then transferred to a computer for archiving.

The company applies procedures for obtaining non-destructive testings of the mechanical properties of pipelines and tanks using ultrasonic measurements.

 

2. Visual Testing – VT

 

VT applies methods and means for inspection of surface imperfections of materials and products using visual observation and evaluation of the type and size of detected flaws in dark and hard to access areas of the tested equipment.

3. Magnetic Testing

 

 

Magnetic flux leakage (MFL) is a magnetic method of non-destructive testing used to detect corrosion and pitting in steel structures, most commonly pipelines and storage tanks. The basic principle is that a powerful magnet is used to magnetize the steel. At areas where there is corrosion or missing metal, the magnetic field “leaks” from the steel. In an MFL tool, a magnetic detector is placed between the poles of the magnet to detect the leakage field. Analysts interpret the chart recording of the leakage field to identify damaged areas and hopefully to estimate the depth of metal loss.