Exceptionally, short lengths of the emergency fire pump suction and discharge piping may penetrate the machinery space if it is impracticable to route it externally provided that the integrity of the fire main is maintained by the enclosure of the piping in a substantial steel casing.
Izjemoma lahko kratki deli sesalnih in izpustnih cevi zasilne požarne črpalke vodijo v strojnico, če bi jih bilo nepraktično speljati zunaj nje, če se celovitost glavnega požarnega voda ohrani tako, da se cevi zavarujejo z debelo jekleno oblogo.