15.3 Fire pumps
Fire pumps are of simple robust construction to ensure high reliability when called upon to operate in an emergency. The pumpsets are usually self-contained packages driven by diesel engines with the start-up motors supplied from a local battery pack. Water for engine cooling is taken from the pump discharge. Shaft leakage is controlled by traditional soft-packed glands rather than the more sophisticated mechanical seals. This eliminates any risk of enforced shutdown which could arise from failure of a mechanical seal.