What type of gas indicator must be provided on manned tank barges and tankships?

On manned tank barges and tankships, it is essential to have a combustible gas indicator. This device is critical for ensuring the safety of the crew and the vessel by monitoring the levels of combustible gases in the atmosphere. Since these vessels often transport flammable liquids, the presence of a combustible gas can pose serious risks, including the potential for explosion or fire.

A combustible gas indicator continuously measures and alerts the crew when gas concentrations reach dangerous levels, allowing for immediate action to mitigate risks. This is essential in maintaining a safe working environment and complying with regulatory requirements.

In contrast, an oxygen level indicator primarily monitors oxygen levels rather than combustible gases, which may not be sufficient for addressing the specific hazards associated with flammable cargo. General gas detectors may encompass a broader range of gases but might not focus specifically on combustibility, diminishing their utility in this context. Similarly, proximity gas sensors are typically used for different applications and do not provide the detailed continuous monitoring necessary for safety on tank barges and tankships. Thus, having a dedicated combustible gas indicator is paramount for safety in these operations.