Statutory Non-Destructive Test Inspections

Steam boilers are legally required to be examined by a Competent Person (CP) per a Written Scheme of Examination (WSE). Typically, this requires an annual inspection and working examinations. A Non-Destructive Test (NDT) must be carried out every 5 years. Dunphy can prepare any boiler to ensure it meets the expectations for these assessments, so you’re in the optimum position to pass regulations.

With over 50 years’ worth of experience in the heat and steam generation sector, you won’t find a more knowledgeable, professional team elsewhere. Our engineers have been assisting businesses with statutory boiler inspections and NDT’s for many years and understand the importance of proper boiler maintenance. Get in touch to learn more.

What does this service involve?

The inspection process will vary slightly depending on the age and model of your boiler, but generally, it involves the following steps:

  • Initial boiler risk assessment
  • Boiler and fitting stripped down to allow inspection by Dunphy and Competent Person for the “out of service” examination
  • Returning the boiler to service and completing the “in service” examination with the Competent Person, verifying the correct function of the boiler protective devices
  • Exposing and preparation of the internal and external welded seams of the boiler
  • Removing the brickwork and quarl to expose furnace tube welds
  • Welds and seam cleaning
  • Providing quotes for repairs or further testing if any faults are found
  • Replacing boilerhouse cladding and lagging
What is an annual inspection?

A statutory inspection / thorough examination by the CP is required by law and is a process that ensures that critical machinery and infrastructure is well maintained to avoid detrimental accidents. It generally comprises of:

  • An “out of service examination” where the boiler and its fittings are stripped down to allow close inspection by Dunphy and the CP.
  • An “in service” examination where the boiler is returned to service and the correct function of protective devices is verified. This is completed as soon as reasonably practicable after the out of service examination.

The protective devices that must be inspected and/ or tested include:

  • Pressure gauge;
  • Pressure controller;
  • Safety relief valve;
  • Pressure limit switch;
  • Water level controls/ limiters;
  • Flame detection device.
What is a Statutory Non-destructive Test (NDT) Inspection?

A Statutory Non-destructive Test (NDT) is an inspection that is required by law and it’s a process that ensures critical machinery and infrastructure is well-maintained to avoid detrimental accidents. In the case of boilers, it is a requirement for steam boilers to have a non-destructive test (NDT) generally every 5 years.

This entails exposing and preparing sections of the boiler construction in order that the following welded joints can be tested:

  • Shell-to-endplate;
  • Furnace-to-endplate;
  • Longitudinal seams.

The benefits of our statutory boiler inspection and non-destructive test (NDT) preparation services


Inspections from Dunphy's well-trained, BOAS qualified engineers


Our excellent customer service throughout the preparation process


Over 50 years of experience in the sector


Repairs from qualified Dunphy engineers


Genuine Dunphy part replacements (if required)


Bespoke quotes for your specific boiler-type


Improved regulatory compliance with PSSR


Increased safety and protection of workers and site visitors


Improved boiler efficiency

Why choose Dunphy?

We’re the leading provider of combustion equipment in the UK and have over 50 years’ worth of experience in the industry. This means there’s no better choice for your boiler house repairs. Get in touch with a member of our expert team to learn more.


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