157.19—Cargo tank arrangement and size.
(2)
A U.S. vessel that is delivered before January 1, 1977, for which the building contract is awarded after January 1, 1972, or, if there is no building contract, the keel is laid or the vessel is at a similar stage of construction after June 30, 1972; and
(3)
A foreign vessel that is delivered before January 1, 1977, for which the building contract is awarded after January 1, 1974, or, if there is no building contract, the keel is laid or the vessel is at a similar stage of construction after June 30, 1974.
(b)
As determined in accordance with the procedures contained in appendix A of this part, each cargo tank must be of such size and arrangement that:
(1)
The hypothetical outflow for side damage (Oc) or for bottom damage (Os) anywhere within the length of the vessel must not exceed OA (30,000 cubic meters or (400)×(3√ DWT) whichever is greater, limited to a maximum of 40,000 cubic meters);
(2)
The volume of each wing tank and center tank is less than the allowable volume of a wing tank (VOLW) and the allowable volume of a center tank (VOLC) respectively; and
(c)
If a cargo transfer system interconnects two or more cargo tanks, the system must have valves to segregate the tanks from each other.
(d)
If a line of piping that runs through a cargo tank in a position less than tc from the vessel's side or less than vs from the vessel's bottom as defined in appendix A of this part, has a branch, that branch must have a stop valve:
(2)
Outside each tank into which the branch opens in a location that is immediately adjacent to the point at which the branch enters the tank.
(1)
Fitted with valves located at the point of connection to the tank served to prevent oil outflow in the event of damage to the piping; and