Any person, firm or corporation desiring to store or keep in the city for any period of time any form of poisonous or flammable gas or liquefied petroleum gas, or add to, enlarge or replace any facility used for the storage of such gases, must first get permission from the City Council. The City Council shall require the name of the gas, the place of storage and the amount of gas stored. If permission is granted, the City Council shall prescribe such rules, regulations and precautionary actions as may be deemed necessary. Permit requirements for the initial construction or location of storage facilities shall not apply to those facilities in existence on the effective date of this article; provided, any such present use that is discontinued for a period of 60 days shall not be revived without a permit.