G. Stability problems if no centerline bulkhead.

Problems if leakage in inner hull.

H. Explosion risk in double-hull spaces if vapor detection system not fitted.

Increased construction and maintenance cost.

Stiffer hull structure may lead to localized cracking.

Increased vigilance required to ensure integrity of double-hull spaces.

Increased port and insurance costs due to greater GRT.

I. Approximately 10 percent increase in cost.

L. Stability problems with center bulkhead.

Risk of fractures and oil leakage into SBT could create dangerous atmosphere.

Difficult to clean, gas free, and repair.

Possible risk of local steel wastage or loss of strength due to deteriorated coating.

N. Cleaning mud from ballast spaces a bigger problem than on SH ships.