Focus NDT Ltd


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Focus NDT Ltd

Established in July 1993, Focus NDT is a recognised leader in Non-Destructive Testing (NDT) and inspection activities. With Offices in Rotherham and Aberdeen we provide quality services for Engineering, Transport, Petrochemical, Gas, Nuclear, Manufacturing and Aerospace.

With a full-time staff of qualified technicians and inspectors, Focus NDT prides itself on its Rapid Response and is committed to providing complete customer satisfaction, through the utilization of some of the most advanced NDE methods available including : Magnetic Particle Inspection (MPI), Ultrasonic Inspection (UT), Liquid Penetrant Inspection (LPI) Radiography (RT) & Eddy Current (EC).

Ultrasonic Inspection

This method of testing for flaws utilises sound waves which are introduced into the component via an ultrasonic source, as the sound travels through material reflections or echoes occur from the back surface. In addition any internal discontinuity will reflect the sound wave and generate a signal into the receiver. The time lags of the echoes are measured to determine the thickness of the material and the distance to the discontinuity.

Services Available:

  • Manual Ultrasonic with Digital Sets
  • Immersion system
  • Cassette system for bar inspection in developement
  • Site services for forged, cast or welded products
  • Approved procedures for control checks
  • Approved procedures to specific industry standard
  • Inspectors qualified to PCN, EN 473, SNT-TC 1A , NAS 410
  • Written Practise to SNT-TC 1A & , NAS 410
  • 24hr in house service

Magnetic Particle Inspection

Magnetic particle inspection (MPI) can be used for the detection of surface and near-surface flaws in ferromagnetic materials. Using a permanent magnet, electromagnet, flexible cables or hand-held prods a magnetic field is applied to the item under test. If a flaw is present the magnetic flux is distorted and 'leaks'. Fine magnetic particles, (normally in spray form in carrier fluid) can be applied to the surface of the specimen, are attracted to the area of flux leakage creating a visible flaw indication. It is recommended that the inspection surface is magnetised in at least two perpendicular directions at 90° to each other, due to lack of disturbance to the magnetic field if the crack runs parallel to the magnetic field.

Common Methods include:

  • White contrast paint with black (or sometimes red) magnetic particle ink
  • Dry powder - as an alternative to wet inks
  • The most sensitive technique - fluorescent particles viewed under UV (black) light

Services Available:

  • 6000-15000 amp bench units
  • Multiple technique fluorescent and colour contrast In-house and On-site Inspection
  • Approved procedures for control checks
  • Approved procedures to specific industry standard
  • Inspectors qualified to PCN, SNT-TC 1A , NAS 410
  • Written Practise to SNT-TC 1A & , NAS 410
  • 24hr in house service

Liquid Penetrant Inspection

This method involves applying a visible or fluorescent dye to the surface. After application by immersion or spray the dye enters any discontinuities via capillary action. The component is wiped dry and any subsequent seepage from fissures is detected by drawing the liquid out into a white absorbent coating applied after drying off (See Diagrams Below). This method is suitable for any non ferrous components or material that is non absorbent. Typical applications are forged, cast or welded products.

Services Available:

  • Fluorescent Liquid Penetrant line for small components
  • Fluorescent Penetrant line for medium sized components
  • Fluorescent Penetrant system for large components
  • Site services visible red for welds and rectified areas of components etc.
  • Approved procedures for control checks
  • Approved procedures to specific industry standard
  • Written Practise to SNT-TC 1A & , NAS 410
  • 24hr in house service

Eddy Current Inspection

Eddy Current can be used in two different manners, Firstly for finding surface and subsurface flaws, and Secondly for determining different metallurgical characteristics. Eddy current is based on the principle of measuring changes in the impedance of an electromagnetic coil as it is scanned over a surface of conductive material.

An alternating current in the coil produces a magnetic field that is induced in the material. To counter the coil's primary magnetic field, eddy currents are produced in the material. Eddy currents produce a secondary magnetic field H'B to oppose the coil's primary magnetic field HB. When the coil is scanned over a discontinuity, the secondary magnetic field is distorted, thereby changing the loading on the coil. Changes in coil loading directly affect the coil impedance, these changes are signified on the trace as a (possible) flaw.

Services Available:

  • Portable and On - Site in laboratory metal sorting

Radiographic Inspection

A source of ionising radiation positioned at on one side of item to be inspected, and a photographic film placed in close proximity to the other side. The radiation is partly absorbed during transmission and differences in material thickness or absorption qualities are recorded on the film giving a full-size image showing internal detail. The higher the Material density more radiation absorbtion will occur.

Processed films are called radiographs, Industrial radiography requires X-rays or gamma rays to reveal hidden flaws in solid objects. X-ray radiography is generated electrically by means of a high voltage X-ray tube. Gamma rays are produced by the natural disintegration of nuclei in a radioactive isotope. Common types being Iridium 192 and Cobalt 60. Radiography's main benefits are that it provides a non-destructive method of detecting hidden flaws in materials and fabrications and provides a permanent record. Radiography is particularly good at detecting volumetric flaws such as voids, gas pores and solid inclusions, It is also good at determining the nature and dimensions (length and width) of flaws - however it cannot be used to measure through-thickness of defects.

Services Available:

  • Raytech Super X2000 9MeV Linear Accelerator Manipulator mounted giving total flexibility during examination, capable of penetrating section thickness up to 610mm
  • 2 off Tech Ops 120 curie Cobalt 60 isotope
  • 1 off Tech Ops 120 curie Iridium 192 isotope
  • 2 off Rigaku Portable 300 Kva panoramic X-ray Set.
  • 6 off Rigaku Portable 300 Kva Directional X-ray Set.
  • 4 off Philips 300 Kva Directional X-ray Set
  • 2 off Philips 200 Kva Directional X-ray Set
  • 4 off 40' Transportable darkrooms
  • 2 Radiography Bays configured with Cobalt 60 up to 120 curies, Ir 192 up to 120 curies and our latest acquisition a 9MeV LINAC capable of penetrating up to 610mm.
  • Both bays are equipped with heavy lifting equipment and the main storage area is also equipped with a 30 ton capacity overhead crane, transfer boogies in to the bays plus a forklift for loading and unloading.
  • A large storage area (60m x 30m) within the building. Large access door to the building allow vehicles in to the storage area for ease of loading and unloading

Hardness Testing

BRINtronic Automatic Brinell Microscopes

Calibrated according to clauses 4.4.2 of ISO 6506-2 and 15.1.3 of ASTM E10. Measures indentations in the authentic optical manner and is UKAS certified to ISO6506 and ASTM E10. Fully automatic - no measurement by the operator and no operator influence on the results. Fast - displays test results in HBW and mm in tenths of a second. For use on normal industrial hand prepared surfaces as well as mirror finish reference blocks, nothing special required. Suitable for both shop floor and laboratory use, and ideal for settling disputes. A modular construction allowing the user to replace components on site and featuring a 4.6M armoured cable, steel bodied microscope unit with military style connectors, free standard software upgrades, and simple change over of all components, even a new laptop can be fitted on site and a special securing foam supplied (BRINtronic-LT). The microscope unit features internal logic to ensure that the correct calibration data is used for every test regardless of the microscope unit used (where more than one is available). Results provided in HBW and mm, and available to 2 decimal places (HBW) and 4 decimal places (mm). Measures indentations made with 2.5mm/5mm or 5mm/10mm indenters (depending on microscope unit).

Software features include:

  • Print out batch summary (batch size, batch mean, standard deviation, no. of high and low rejects), with or without individual test results. Bespoke software available.
  • User interface in a wide variety of languages including Chinese, Japanese, Korean, Russian, as well as European script
  • Fully networkable - can communicate with a remote computer and download/upload batch data if so required
  • Automatically saves test results to hard disk, option to save images
  • Facility to interrupt batch testing to make individual tests and then resume batch without data corruption
  • Software signals if batch limits are violated, batch range, and standard deviation of results
  • Information parameters can be user defined including annotation of individual results

Test Block Calibration

Calibration Blocks

Calibration/Reference/Standard blocks are available for Compression, Angle beam and Thickness calibrations of common materials. Blocks can be manufactured from steel, stainless steel, or aluminium commonly, although other materials may be used. Please Note these may require special quotes for price and delivery, feel free to contact us for more information regarding materials not listed, blocks not listed, or custom blocks. All blocks are checked dimensionally using measuring equipment IAW - EN, ASTM, ANSI, API Specs(Custom Blocks/Alternative specs catered for.) For the most commonly required calibration blocks please

click here.

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