Fire protection pipes to be used in case of fire will be allowed within and without buildings subject to this section. When the owner of a building desires, or when the building code calls for a certain size pipe to supply water to a wet or dry sprinkler system without hose connections, such pipe or pipes may be served by a U.L. Approved “Fire Meter” or a detector check or as approved by the City Engineer to include a Oregon State approved backflow device. The owner or owner’s agent of such building shall make written application and agree in writing that water supplied through this service will not be used for any purpose except for extinguishing a fire. If at any time it is found that hose connections have been added to the system or that registration is recorded on the meter or detector check, the immediate installation of a meter will be required by the city at the owner’s expense.