A written scheme of examination is a document containing information about selected items of plant or equipment which form a pressure system, operate under pressure and contain a ‘relevant fluid’. The term relevant fluid is defined in the Regulations and covers compressed or liquefied gas, including air, at a pressure greater than 0.5 bar (approximately 7 psi) above atmospheric pressure; pressurised hot water above 110 °C; and steam at any pressure. 


Typical contents of a written scheme of examination include:

  • Identification of the items of plant or equipment within the system

  • those parts of the system which are to be examined

  • the nature of the examination required, including the inspection and testing to be carried out on any protective devices

  • the preparatory work needed for the item to be examined safely

  • where appropriate, the nature of any examination needed before the system is first used

  • the maximum interval between examinations

  • the critical parts of the system which, if modified or repaired, should be examined by a competent person before the system is used again

  • the name of the competent person certifying the written scheme of examination

  • the date of certification

If you do not currently have a WSE document for your system, we can arrange for a Qualified Engineer to collate the relevant information and produce this for you at a very reasonable cost. The document generally lasts for three years, after which it should be re-validated to account for any changes to your system.

If you do have a current document, we have the competent personnel to carry out the annual checks/tests.



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