Code of Federal Regulations Title 33. Navigation and Navigable Waters § 33.154.530 Small discharge containment

(1) Each hose handling and loading arm area (that area on the facility that is within the area traversed by the free end of the hose or loading arm when moved from its normal stowed or idle position into a position for connection);

(2) Each hose connection manifold area;  and

(3) Under each hose connection that will be coupled or uncoupled as part of the transfer operation during coupling, uncoupling, and transfer.

(1) Two barrels if it serves one or more hoses of 6–inch inside diameter or smaller, or loading arms of 6–inch nominal pipe size diameter or smaller;

(2) Three barrels if it serves one or more hoses with an inside diameter of more than 6–inches, but less than 12 inches, or loading arms with a nominal pipe size diameter of more than 6 inches, but less than 12 inches;  or

(3) Four barrels if it serves one or more hoses of 12–inch inside diameter or larger, or loading arms of 12–inch nominal pipe size diameter or larger.