This publication has been written to aid stakeholders in the process of transfer of knowledge from those responsible for the manufacture of equipment, assemblies and systems to the User/Owner and Competent Person, who are responsible under the Pressure Systems Safety Regulations 2000 (PSSR) for a Written Scheme of Examination (WSE). 

To draw up an effective WSE and enable effective examinations, inspections, repairs and modifications to the equipment once it enters service, the transfer of such information and knowledge is imperative. In the UK, it is illegal to operate pressure systems which fall under the PSSR without establishing Safe Operating Limits and having a suitable WSE in place.