High pressure vessels can present a variety of hazards due to their pressure and /or contents. Statutory pressure vessels such as steam boiler, steam receiver, air receiver, refrigerant plant pressure receiver and cast-iron underfired vulcaniser need to apply for approval before they are brought into use.  For details as well as information on how to apply for approval, please visit the website at http://www.mom.gov.sg/FAQs/OSHD/HazardousEquipment.htm and send email to the School Safety Officer scbesafety@ntu.edu.sg. As for other high pressure equipments not classified under the statutory equipment above, you are advised to carry out a suitable risk assessment to identify the hazards in operating such equipment and to develop appropriate measures and control systems to address the risks in consultation with the Safety Officer.  For guidelines on risks assessment and management, please visit the website at http://www.mom.gov.sg/OSHD/Resources/Guides/Guidelines/index.htm.