A key elements of the offshore protective system is the fixed fire suppression system. These are made up of a number of cylinder points that will release the suppressant agent when a fire incident is detected. One of the key challenges with fixed fire suppression systems has been monitoring the individual cylinder points liquid level. Cylinder points can suffer from leakage and accidental discharge over time. Often, cheap systems only minimally comply with the regulations and there are very few qualified engineers who may be considered experts on the subject matter. Routine maintenance is liable to be overlooked because it is difficult, the crew are unqualified to test and may be given insufficient attention by the rig owners. No longer necessary to use the laborious weighing method to monitor the contents of suppressant agents, now ultrasonic technology offers a better method. The Portasteele® Calculator is an advanced calculator application, that converts the liquid level height of CO2 & marine CO2 systems, NOVEC™ 1230 and FM-200® liquefied gaseous extinguishant agent readings taken on an ultrasonic non-destructive liquid level indicator device into the agent weight/mass. The cylinder database function means often tested cylinder types, such as 45kg CO2, commonly found on supply vessels, rigs and platforms, can be recalled reducing testing time, providing an incredibly quick to use tool. Plans to incorporate additional functionalities, such as agent type indication, are already in their final planning stages. In the long term, the acquisition of Portasteele® Calculator into offshore platforms, oil tankers etc. will improve overall Safety Management Systems and reduce cost associated with the maintenance of fire suppression systems. When these fire systems are properly maintained, the cost associated with fire damage is likely to reduce dramatically as we know fire damages on these hazardous offshore environments are generally catastrophic to lives, asset, environment and company reputation.