; (D) commercial vessel characteristics, such as engine room size, layout, or a lack of installed piping; (E) electric power generating capacity aboard the commercial vessel; (F) the safety of the commercial vessel and crew; and (G) any other factor that the Secretary determines appropriate. (4) Consideration of petitions (A) Determinations The Secretary shall approve or deny a petition for an extension of a compliance deadline submitted by an owner or operator under this subsection. (B) Deadline If the Secretary does not approve or deny a petition referred to in subparagraph (A) on or before the last day of the 90-day period beginning on the date of submission of the petition, the petition shall be deemed approved. (5) Period of use of installed ballast water management system (A) In general Subject to subparagraph (B), an owner or operator shall be considered to be in compliance with the ballast water discharge standard if— (i) the ballast water management system installed on the commercial vessel complies with the ballast water discharge standard in effect at the time of installation, notwithstanding any revisions to the ballast water discharge standard occurring after the installation; (ii) the owner or operator maintains the ballast water management system in proper working condition, as determined by the Secretary; and (iii) the ballast water management system continues to meet the ballast water discharge standard applicable to the commercial vessel at the time of installation, as determined by the Secretary. (B) Limitation Subparagraph (A) shall cease to apply with respect to a commercial vessel after— (i) the expiration of the service life of the ballast water management system of the commercial vessel, as determined by the Secretary; (ii) the expiration of the service life of the commercial vessel, as determined by the Secretary