Complete Fire Safety can conduct the mandatory 5 yearly hydrostatic test and refill of Carbon Dioxide gas cylinders at our offices in Goodwood. CARBON DIOXIDE (CO2) FIRE EXTINGUISHERS. In addition to regular 6 monthly fire extinguisher servicing, Australian Standard 1851 states that fire extinguishers shall have a hydrostatic pressure test carried out on them every 5 years. In addition to … Continue reading CO2 Cylinder Refills