On a tanker, immediately before or on arrival at the terminal to load or discharge cargo, the ship's fire hoses should be connected to the fire main, one forward and one aft of the ship's manifold. If practicable, a pump should maintain pressure on the ship's fire main while cargo or ballast is being handled. If this is not possible, the fire pump should be in a stand by condition and ready for immediate operation. In cold weather, freezing of fire mains and hydrants should be avoided by continuously bleeding water overboard from hydrants at the extreme end of each fire main. Alternatively, all low points of the fire main may be kept drained.