Non Destructive Testing (NDT)

NDT covers a wide group of testing techniques used to evaluate the properties of a material, part, product, weld or system without causing damage.  NDT carried out at KLL includes:

  • Liquid Penetrant Testing (LPT) is used for the detection of surface breaking discontinuities on magnetic and non-magnetic metallic materials.
  • Fluorescent and colour contrast penetrants are available to be used in the following methods:-
  • Water washable
  • Solvent removable
  • Post emulsifiable
  • Magnetic Particle Inspection (MT/MPI) is used for the detection of surface breaking and slightly sub-surface (up to 2mm) discontinuities.
  • Bench type crack detectors and portable units are employed producing various waveforms (i.e. A.C, HWDC and induced magnetic flow) to give both circular and longitudinal magnetism.
  • On-site testing is carried out using electro magnetic yokes and permanent magnets producing induced magnetic flow.
  • Ultrasonic Flaw Detection (UT), also known as Ultrasonic Inspection, is used for the detection of volumetric discontinuities in ferrous and non-ferrous products (forgings and castings etc.), and welds in magnetic and non-magnetic materials.
  • UT is capable of penetrating metals, dependent on the material characteristics, up to 10m in length.
  • Some thickness and depth checks can also be carried out using ultrasound.
  • Radiography services are available through sub-contract booked in advance. Notice is required for on-site work.
  • Personnel are available at short notice for in-house or on-site work in the UK and overseas.
  • All inspectors undertaking non destructive testing (LPT, MT/MPI and UT) are qualified to, and meet a minimum of, PCN Level 2.
  • PCN Level 3 supervision is available in-house for LPT, MT/MPI, UT offering consultancy services including procedure writing and commentary, auditing of techniques and Level 3 Supervisor cover.
  • We can assist clients in product qualification, material testing, quality assurance and audit programmes.

Ancillary non-destructive processes are available at Keighley Laboratories, click on the link for further details: Ancillary NDT processes

  • Product is undamaged
  • Identifies defects that could prove disastrous
  • Reliability and repeatable – different testing methods available
  • Economic
  • Assurance of product integrity
  • Can be used on magnetic and non-magnetic material
  • Carried out on actual components or test samples.
  • Liquid Penetrant Testing (LPT)
  • For special applications dual penetrants (fluorescent and colour contrast) can be obtained as can thixotropic penetrants (those with variable viscosity) for use on critical areas of on-site components.
  • Testing can be undertaken both in-house and on-site, working to national and international specifications including BS EN ISO 3452-1.
  • Magnetic Particle Inspection (MT/MPI)
  • Indications of discontinuities are revealed using fluorescent and colour contrast detecting media.
  • Testing can be undertaken in-house or on-site, working to national and international specifications including BS EN ISO 9934-1.
  • Ultrasonic Flaw Detection (UT)
  • Undertaken using digital and analogue machines capable of ‘A’ scan display at frequencies up to 6MHz employing both normal (0 degree) and angle probes.
  • Ultrasonic flaw detection is capable of testing most metallic materials up to 10m in length, dependent on the material characteristics.
  • Tests in-house or on-site, working to National and International specifications including BS EN 10160, BS EN 1714, BS EN ISO 16810.

Matthew Mellor

Technical Services Director 

Carl Barker

Test House Manager

Roger Wheatley

Senior Technician NDT

Keith Blower

Technical Director

John Whitaker

Chief Chemist

Tom Varley

Chemical Analysis 

Graham Woodward

Chem Lab Supervisor

General Enquiries

Technical Services

Keighley Laboratories Ltd
Registered Office:
Croft House
South Street
West Yorkshire
BD21 1EG
Registered in England 164811
UK Tel: +44 (0)1535 664211

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