IN-SITU NDT Services

Description of Specific Services

All main Nondestructive Testing (NDT) methods for structural integrity characterization are performed by NNDT, as mentined below:

    • Ultrasonic examinations (UT) including Phased Array (PAUT) and Timeof Flight Diffraction (TOFD);
    • X-ray and Gamma – ray penetrant radiation testing (RT-X & RT-Gamma)
    • Ultrasonic thickness measurements (UT-thickness);
    • Magnetic particle examinations (MT), liquid penetrant examinations (PT);
    • Eddy current (ET) for heat exchanger tubing and welds, including automotive and aviation industry;
    • Eddy current (ET) for welds and various components, in automotive, aviation, chemical and nuclear industry;
    • Leak testing (LT) by helium mass spectrometry, or bubble gas technique using special bubble forming liquids and high diffusive gases;
    • Visual examinatios (VT) and Digital Video endoscopy (DVT) corroborated with dimensional characterization by optical instrumentation for examinations and measurements;
    • Dimensional Characterization for pipes (DCP), respectively for pressure vessels and tanks (DCVT);
    • Determination of protection layers thickness (DPT) e.g., corrosion protection paint layers;
    • Acoustic Emission testing of piping, pressure vessels and storage or transportation tanks.

These examinations are performed in conformity with the requirements of ASME Code, European (EN) normes, ISO or API standards, according to national standards indicated by Client, or following NNDT specific and validated procedures.

Special methodologies are also included in the NNDT capability to perform on-site materials investigations, like the followings:

    • Metalographic Analysis (Ambulant Metallography) by replica technique (MRT) or by direct optical examination using a portable digial microscope (MDM);
    • Hardness Testing (HT) using ecotip or Vickers portable instruments;
    • Chemical Analysis (PMI or CCA ) using portable X-ray fluorescence spectrometer, or mobile optical emission spectrometer

NDT application capabilities of NNDT in industial services are presented below:

– Direct examination or using optical devices;

– Stereomicroscopic examination, especially on fracture surfaces or affected areas of damaged parts;

– Endoscopic inspection, including examination with camera and computer image acquisition & analysis, including endoscopy of axial bore of rotors, piping sistems, pressure vessels;

– Visual Inspection based on chemical attack (etching)

– Liquid penetrant examination (PT);

– Magnetic powder examination (MT) using various methods for magnetization (AC / DC yokes, permanent magnet yokes, magnetizing by electrodes, high current magnetizing machines using cables or direct current flow;

– Ultrasonic testing using surface and / or guided wave techniques in the case of thin components (UT-surface);

– Manual Eddy Current examination using surface probes (ET-surface) for base materials and welds

– Manual or semi-automatic normal beam and angle beam examinations of castings, forgings, laminated products (plates, tubing, pipes, fittings, etc.), welded structures, nodular iron castings, etc.

– Automatic boresonic examination of forged rotors;

– Automatic immersion ultrasonic testing (including erosion / corrosion) of large diameter heat exchangers tubing;

– Manual or semi-automatic Phased Array and Time Of Flight Diffraction techniques for welds and various components

– X-ray or Gamma-ray testing of welds, castings and specific components;

– Eddy Current Testing of non-magnetic heat exchangers tubing by multifrequency bobbin coil techniques;

– Eddy Current Testing of ferromagnetic heat exchangers tubing by RFT or partial saturation technique

– Manual measurements using ultrasonic gauges;

– Automatic immersion ultrasonic measurements (corrosion maps)

– Ambulant Metallographic examination (by replica technique & direct optical microscopy examination);

– Sulfur prints (Baumann) according to ASTM E1180;

– Hardness Testing (Brinell, Vickers, Rockwell);

– Chemical analysis (optical emission or X-ray fluorescent spectrometry);

– Measurement of internal stresses (tensiometric method);

– Bolting torque strength (ultrasonic time of flight technique);

– Gas pressure testing, combined or not with bubble technique, using high diffusive gases;

– Helium mass spectrometry technique;

– Hydrogen detection technique – stage: implementation study;

– Measurements of length, diameters, ovality, curvature radius, gaping etc.;

– Gauging for correct shape: sag, bending angle, parallel / perpendicular planes

– Measurements of paint thickness;

– Measurement of metallic coatings by metallographic examination (destructively, on witness samples);

– Characterization of metallic coatings (by Eddy Current or ultrasonic techniques);

– Measuring of Adhesion of paint layers;

– The high accuracy and reliable AMSY- 6 equipment from Vallen Systeme GmbH – Germany are used for both structural condition monitoring during plant operation or for AE examination during pressure testing