4888. A pump room is suspected of accumulating gases after a ventilation machinery breakdown. Where should the combustible gas indicator case be placed when testing the pump room atmosphere for combustible gases?

The combustible gas indicator case should be placed on the deck outside the pump room to maintain a safe, gas-free environment for the instrument and operator while drawing samples via a sampling hose. This practice minimizes ignition sources and allows for testing from a known safe location, adhering to SOLAS regulations and standard tanker safety procedures.