Services
Offshore services such as Eddy Current Testing, Magnetic Particle Testing & Ultrasonic Thickness Testing
Magnetic Particle Iinspection on Liners
Magnetic Particle Inspection
Magnetic Particle Inspection of Ship Tail Shaft

Non Destructive Testing Services

Sonometric Inspection has a long standing relationship with many Clients all over the world as a result of our high quality reports. All reports are generated by our experienced report coordinators on our custom designed reporting system or the Classification Society reporting software along with our detailed and accurate CAD drawings.

 

Click on the images to enlarge them.

 

EDDY CURRENT INSPECTION - ET (WELD INSPECTION)

eddy-current-ndt-inspectionEddy current is good for detecting surface-breaking defects, can detect defects through fairly thick coatings (up to 2 mm), and can be used on wet surfaces, but several scans of an individual weld must be performed to
ensure a defect is not missed.

As eddy current is best used for detecting surface-breaking cracks, its most practical applications relate to the in-service inspection of welded structures that are subject to a cyclical loading that can lead to fatigue crack propagation in critical welded areas.

 

ULTRASONIC FLAW DETECTION - UT

ultrasonic-flaw-detection-on-tierodsUltrasonic testing uses the transmission of high frequency sound waves into a material to detect imperfections within the material or changes in material properties. The most commonly used ultrasonic testing technique is pulse echo wherein sound is introduced into the test object and reflections (echos) are returned to a receiver from internal imperfections or from geometrical surfaces of the part or tube.

 

ULTRASONIC THICKNESS MEASUREMENTS - WT

digital wall thickness measurement on hull of vesselDigital wall thickness measurement is used to determine the thickness of different items and detect corrosion that may have occurred on a part that is not open to other types of inspection. Our equipment allows us to efficiently inspect your project and compile detailed reports and CAD drawings.

As one of the world leaders in ultrasonic thickness measurement services, we have extensive experienced and competent technicians to provide high quality services in accordance to the   Classification Societies and/or the Client's requirements.

Sonometric Inspection has a long standing relationship with many Clients all over the world as a result of our high quality reports. All reports are generated by our experienced report coordinators on our custom designed reporting system or the Classification Society reporting software along with our detailed and accurate CAD drawings.

 

MAGNETIC PARTICLE TESTING - MT

 magnetic-particle-inspection-of-connecting-rodHigh Sensitivity Crack Detection Testing on ferrous-magnetic components and welds with AC or permanent magnet portable yokes, Fluorescent and Colour Contrast Inks and powder for low and high temperature conditions.

Magnetic particle testing is done by inducing a magnetic field in a ferro-magnetic material and dusting the surface with iron particles (either dry or suspended in a liquid). Surface imperfections will allow the magnetic field to leak out of the part, distort the magnetic field and concentrate the iron particles near imperfections, thus indicating their presence. Magnetic Particle Testing uses magnetic leakage fields to detect surface and subsurface cracks and discontinuities.

We can provide the inspection service both in the field and at our head office with high volume processing of many different parts using both fluorescent and visible, wet or dry methods.

 

LIQUID PENETRANT TESTING - PT

liquid-penetrant-inspection-on-propeller-bladeLiquid Penetrant testing is probably the most widely used NDT method. The test object or material is first cleaned and then coated with a visible or fluorescent dye solution. After a pre-selected time interval (Dwell time), the excess dye is removed from the surface, and then a developer is applied. The developer acts like a blotter and draws penetrant out of imperfections which are open to the surface. With visible dyes, the color contrast between the penetrant and the developer makes the "bleedout" easy to see. With fluorescent dyes, an ultraviolet lamp is used to make the "bleedout" fluoresce brightly, thus allowing the imperfection to be seen readily.

With a wide variety of penetrant chemicals and our fluorescent penetrant inspection system, we can provide the inspection service both in the field and at our head office with high volume processing of many different parts using both fluorescent and visible penetrants methods.

 

RADIOGRAPHIC EXAMINATION - RT 

  eddy-current-tube-inspection-64px Radiography involves the use of gamma or x radiation to examine parts for flaws that could be detrimental to their intended use. A radioactive isotope or a x-ray machine is used as a source of radiation dependant on the material, accessibility. Radiation is directed through a part onto a film.
When the film is processed, a negative-like picture is obtained that shows the internal characteristics of a part. Possible imperfections show up as density changes in the film. Our Level II radiographers and appointed ASNT Level III radiographer are experienced in many different specialty techniques involving geometrically challenged parts.

 

HARDNESS TESTING

Hardness testing is used on welds, heat affective zones and base materials to detect hardness. Hardness is a characteristic of a material, not a fundamental physical property. It is defined as the resistance to indentation, and it is determined by measuring the permanent depth of the indentation. More simply put, when using a fixed force (load)* and a given indenter, the smaller the indentation, the harder the material. - Brinnell, Shore, Rockwell or Vickers.

 

EDDY CURRENT TUBE INSPECTION - ECT

Eddy current is a noncontact method used to inspect non ferromagnetic tubing. In this technique, the probe, which is excited with an alternating current, induces eddy currents in the part that is under inspection. Any discontinuities or material property variations that change the eddy current flow in the part are detected by the probe as a potential defect. This technique is suitable for the detection and sizing of metal discontinuities
such as corrosion erosion , wear, pitting, baffle cuts, wall loss, and
cracks for nonferrous materials including austenitic stainless steel such as SS304/SS316, brass, copper-nickel, titanium, copper, finned, and others.
For tube inspections, multi frequency eddy currents can locate and size defects under support plates and at the tube sheet. Eddy current equipment is perfectly suited for the inspection of condensers, feed water heaters, air conditioners, and surfaces.

 

REMOTE FIELD APPLICATIONS - RFT

Remote field testing (RFT) probes are being used to successfully inspect ferromagnetic tubing such as carbon steel or ferritic stainless steel. They are very sensitive for detecting and measuring volumetric defects resulting from erosion, corrosion, wear, and baffle cuts. Sensitivity to pitting has been further improved with the new design of the remote field probe. The
remote field probe is a low- frequency variant of the exciter- (driver) pickup eddy current probe, characterized by a exciter- pickup distance of at least 2.5 to 3 times the tube OD. This distance is necessary and critical in order to have the pickup coils sense the "remote" magnetic field rather than the "direct" field.
Olympus remote field probes and equipment are used successfully around the world to inspect heat exchangers, feedwater heaters, and boiler tubes. RFT is a through-wall transmission technique. The basic probe is made of one exciter coil and two pickup coils. Two magnetic fields are present: the direct field, in the vicinity of the exciter coil, is rapidly attenuated with distance, while the indirect field is diffused outward through the tube wall. The near field then propagates along the tube axis and is then rediffused back through the tube wall. The zone where the indirect field is dominant is called the remote field. This zone is present at a distance greater than 2 tube diameters. All remote field probes have their pickup
coils set at 2.5 to 3 times the tube OD to ensure that only the indirect field is picked up. All Olympus RFT probes have a set of circumferential pickup coils that can be operated simultaneously in absolute and differential mode.

 

MAGNETIC FLUX LEAKAGE - MFL

The magnetic flux leakage (MFL) technique is based on the magnetization of the material being inspected. The magnetization is provided by a strong magnet located inside the probe. As the probe encounters a wall reduction or a sharp discontinuity, the flux distribution varies around that area and is detected either with a hall-effect transducer or with an inductive pickup coil.
MFL measures the magnetization of the tube to detect irregularities such as corrosion and steam erosion. MFL is recommended for the inspection of aluminium-finned carbon steel tubes because the magnetic flux is not affected by the presence of fins.
The MFL technique is also suitable for the detection of circumferential cracks: a type of flaw that is not detected by RFT or IRIS inspections. For better results, the TFB series probes should be used with the TF-ADP-001 adaptor.

 

INTERNAL ROTARY INSPECTION SYSTEM - IRIS

The internal rotary inspection system (IRIS) is an ultrasonic technique well- suited for petrochemical and balance-of-plant (BOP) tube inspections. This technique uses an ultrasonic beam to scan the internal surface of the tube in helicoidal patterns, ensuring that the full length of the tube is tested. Olympus tube inspection systems monitor the front-wall and back-wall echoes in order to measure the tube wall thickness. The internal rotary inspection system probe operates in pulse- echo mode to measure wall
thickness, material loss, and defect orientation within the range of 0.5 in. to 3 in. ID. The IRIS probe consists of an ultrasonic transducer firing in the axial direction of the tube. A mirror mounted on a water- propelled turbine deflects the ultrasonic beam in order to obtain a normal incidence wave on the internal wall of the tube. Because the mirror revolves about the axis, the entire circumference of the tube is examined. A complete IRIS
probe includes the cable, a centering unit, a turbine, and a transducer.
This equipment was designed for optimum results on various applications such as tube and shell heat exchangers, air coolers, and boilers tubes.

 

DIGITAL PHOTOGRAPHY AND CLOSE-UP SURVEY (TANKERS) 

 digital-photography-64pxDigital photography is carried out with, as a minimum, a 10 mega pixel camera and a 18 – 55mm lens. The final report is compiled in detailed and printed in high image quality and supplied with compact disc containing the final report in a PDF file format.

 

ANCHOR CHAIN CALIBRATION

anchor-chain-calibration-64pxAnchor chain links to be visually inspected along the full length and calibrated in four position per link (two fwd and two aft of the link), or as stipulated by the relevant Client or Classification Society

 

 

ROPE ACCESS

 rope-access-rigging-on-oil-rig with-ndt-of-welds-64pxWith rope access, our team is able to access almost any structure that is difficult or expensive to get to with other techniques.

 Our rope access services are done in conjunction with our rope access partners.

 

 

 

Radiography involves the use of gamma or x radiation to examine parts for
flaws that could be detrimental to their intended use. A radioactive isotope
or a x-ray machine is used as a source of radiation dependant on the
material, accessibility. Radiation is directed through a part onto a film.
When the film is processed, a negative-like picture is obtained that shows
the internal characteristics of a part. Possible imperfections show up as
density changes in the film.

 

Contact US

     Call: +27 21 511 6792

 

Ultrasonic Testing Applications

 

  •  Casting, Forgings and Extrusions
  •  Welds and structural steel assemblies

Digital Wall Thickness Applications

 

  •  Plating on all vessels including ESP vessels and Oil Rigs
  •  Mapping of pitting
  •  Mapping and monitoring of corrosion
  •  Steel condition assessment
  •  

Digital Wall Thickness Applications

 

  •  Casting, Forgings and Extrusions
  •  Rolled plate and bar material
  •  Extrusions
  •  Boiler internal inspections
  •   Springs, gears, studs, bolts, nuts, and washers
  •  Welds and structural steel assemblies
  •  Paper mill components such as roll gears, dryer roll heads, and internal baffles
  •  Induction fan blade weldments at power plants
  •   Valve and pump bodies
  •  High pressure header stud welds
  •  Vessel domes
  •  Both seamless and welded pressure vessels
  •   Blades pressure steam turbines and diaphragms
  •  Valve stem

Liquid Penetrant Testing Applications

 

  •  Welds and structural assemblies
  •  Plastics and Glass
  •  Machined parts
  •  Leak test
  •  Paper mill suction pressure rolls
  •  Retaining bands on generator rotors
  •  Valve and pump bodies and seats
  •  Non-magnetic impellers for vessels and hydro-electric power plants
  •  Press fit connections

Radiographic, Casting, Forgings and Extrusions Testing Applications

 

  •  Electronic components
  •  All types of welds and bridge structures
  •  Oil Tankers and Bulk Carriers
  •  Valve and pump bodies
  •  Water and petrochemical above ground storage tanks
  •  Hydro power generation facilities
  •