The Pressure Systems Safety Regulations 2000 cover the safe design and use of pressure systems and aim to prevent serious injury from the hazard of stored energy (pressure) as a result of the failure of a pressure system or one of its component parts. The PSSR ACOP and guidance (L122) is aimed at duty-holders who are involved with pressure systems used at work: users, owners, competent persons, designers, manufacturers, importers, suppliers and installers of pressure systems used at work.