Which monitoring device is expected to be found on tankers engaged in sour crude operations?

In operations involving sour crude oil, which contains hydrogen sulfide (H2S), it is essential to have a dedicated monitoring device for this toxic gas. A hydrogen sulfide monitor is critical for ensuring the safety of the crew and to prevent exposure to harmful levels of this gas, which can be produced during the handling of sour crude.

The presence of H2S in the atmosphere can pose serious health risks, including respiratory issues and potential fatality, thus monitoring systems must be in place to detect and alert personnel to any hazardous concentrations of the gas. This is especially important during loading, unloading, or transferring operations when the risk of H2S exposure increases.

While pressure sensors, temperature gauges, and ventilation systems are all important devices for monitoring various aspects of tanker operations, none address the specific safety concern of H2S exposure as effectively as an H2S monitor does in the context of sour crude operations. Therefore, the correct answer emphasizes the unique risks associated with handling sour crude oil and the importance of safety monitoring in those environments.