What types of equipment are used for fire detection on ships?

The correct answer identifies key equipment used for fire detection on ships, which includes heat detectors, flame detectors, and smoke detectors. Each of these devices plays a crucial role in identifying the presence of fire or conditions indicative of fire.

Heat detectors are designed to respond to changes in temperature within the environment, triggering an alarm when predetermined temperature thresholds are reached. This function is vital in alerting crew members to potential fire hazards before flames are visibly present.

Flame detectors are specialized devices that detect the infrared or ultraviolet radiation emitted by flames, allowing for quicker detection of a fire compared to other devices. This is particularly important in areas prone to fast-developing fires, as they can activate alarms within seconds of detecting flames.

Smoke detectors work by sensing smoke particles in the air, which is one of the first signs of a fire. Their early detection capabilities help initiate firefighting measures and evacuation procedures sooner, potentially saving lives and reducing damage to the vessel.

The other options highlight equipment that either does not serve the primary function of detecting fires or pertains to dealing with emergencies after fires have been detected. For instance, while sound alarms are present in the context of alerts and emergency lighting is essential for safety in dark conditions, they are not specifically categorized as fire detection tools.