(4)(i)An adequate number of portable dry chemical powder or any other fire extinguisher capable of extinguishing oil fires shall always be kept in every storage shed and small Class B or C installations at strategic points and all persons employed at such locations shall be conversant with the use of such fire extinguishers.(ii)Scale of fire fighting provided in other areas of installation should be as per the requirement given to OISD Standard-117 for all installations approved by the Chief Controller after publication of the original standard OISD-117. For installations existing prior to the publication of the standard the fire fighting facilities shall be improved to the extent feasible (keeping this standard in mind) and approved by the Chief Controller.