Yes. In order to perform pressure piping manufacture, installation, or repairs, as well as handling boiler and pressure vessels, you must have a Certificate of Authorization from The Technical Standards and Safety Authority. The TSSA certification ensures that your technician is trained on fuel safety. In addition, if the technician needs to handle refrigerants, they will also need to obtain an Ozone Depletion Prevention certificate to buy and handle refrigerants in refrigerators and air conditioning units.