Norway, Oct. 23 -- DNV has recently identified cases where CO? fireextinguishing systems had multiple depleted CO? cylinders, potentially compromising fire safety and vessel integrity. More about this below.DNV has identified two primary contributors to this issue:1. Incorrect use of ultrasonic liquid level gaugesLevel gauging at temperatures exceeding the manufacturer's instructions on maximum temperature (CO? cylinder temperature) gives unreliable readings. At elevated temperatures, CO? converts into a supercritical fluid state, and the cylinder no longer has a liquid level to measure. 2. Bursting disc materialThe second issue relates to the material used in the CO? cylinder valve bursting disc, to date an issue only observed in systems s...