How can a cargo tank atmosphere be tested for explosive gases?

Using an explosimeter is the correct method for testing a cargo tank atmosphere for explosive gases. An explosimeter is a specialized instrument designed to detect the presence of flammable gases in an environment. This device is capable of measuring the concentration of various gases in the air and providing reliable readings that indicate whether the atmosphere is safe or poses an explosion hazard.

The explosimeter works by sampling the air and using sensors to detect specific gas concentrations. When the readings exceed safe thresholds, it alerts personnel to the potential danger, allowing for appropriate safety measures to be taken before any maintenance or cargo operations commence.

In contrast, measuring pressure with a gauge does not provide information about gas concentrations or their potential explosiveness. Visual inspections can be useful for identifying hazards or leaks, but they cannot accurately assess the composition of the atmosphere. Checking temperature may indicate certain conditions but offers no direct insight into the presence or concentration of explosive gases. Therefore, employing an explosimeter is essential for ensuring safety in environments where flammable atmospheres may exist.