Buffing operations shall be located in a room separated from the remainder of the building housing the tire rebuilding or tire recapping operations by a 1-hour fire barrier.
Exception: Buffing operations are not required to be separated where all of the following conditions are met:
2. Buffing machines are connected to particle-collecting systems providing a minimum air movement of 1,500 cubic feet per minute (cfm) (0.71 m3/s) in volume and 4,500 feet per minute (fpm) (23 m/s) in-line velocity; and
Where the bulk volume of stored product is more than 150,000 cubic feet (4248 m3), storage arrangement shall be in accordance with the following:
2. Adjacent storage piles shall be considered a group, and the aggregate volume of storage piles in a group shall not exceed 150,000 cubic feet (4248 m3).
Separation between groups shall be at least 75 feet (22 860 m) wide.