To minimize calamity in the case of a fire on board a ship or in an offshore plant, ship classification societies are strengthening the fire resistance designs for critical ship compartments to keep the blaze from being spread to other compartments. Particularly in critical compartments where structural integrity should be maintained in the case of a fire, such as the A-0 class division, the fire resistance design of a piece passing through a bulkhead compartment is subject to resolution MSC.307(88), which is the international code for application of fire test procedures. This study identified the fire resistance characteristics of an enhanced bulkhead penetration piece designed for an A-0 class compartment using coupled heat transfer and thermal structure analyses based on the finite element method. To verify the numerical analysis results, an actual fire resistance test was carried out in accord with the test procedure prescribed for the MSC regulations.