As an EN1 or ENC you will be responsible for handling battle casualties, you will have to know the location of isolating and cross-connecting valves, and recognize which of the valves are remotely controlled. As a general rule, personnel safety will be your first consideration in handling casualties.

Effective control of battle casualties depends on a good knowledge of the principal engineering piping systems and related equipment. This information may be found in the ships Engineering Casualty Control Manual, in the Damage Control Book, in the plans of the principle engineering systems, and in other applicable sources located aboard ship. In the event of a battle casualty to an engineering piping system, the damaged section must be isolated and the system should be cross-connected, when possible. Emergency or alternate equipment should be used, when provided, to restore service to vital systems. Whenever feasible, emergency repairs should be made and the system restored to normal operation. Special precautions should be taken to prevent additional damage which may result from any original casualty.