The rules and regulations of Portland Fire & Rescue will be promulgated by the Fire Chief, subject to approval by the City Administrator, and the Fire Chief has authority to issue general and special orders that are administrative in nature and are in addition to or supplemental to the rules and regulations as promulgated by the Chief Engineer and approved by the City Administrator. The rules and regulations and the general or special orders will govern the conduct of the members of Portland Fire & Rescue and will be designed for the efficient and effective functioning of the Bureau.