What is the standard profile requirement for submarines?

The standard profile requirement for submarines is set at 2 mils. This specification is critical as it pertains to the thickness of the paint application. A 2 mil profile ensures adequate surface protection against corrosion and environmental stresses, which is especially significant for submarines due to their unique operating conditions underwater.

The 2 mil requirement aligns with industry standards aimed at providing a sufficient barrier against corrosion while maintaining flexibility and durability in the coatings used. Adhering to this standard also helps optimize the performance of the submarine's hull coating under the varying pressures and conditions experienced during operation.

In the context of other options provided, the thickness levels of 1 mil, 3 mil, and 1.5 mil do not meet the specific requirements set forth for submarine coatings. A 1 mil profile may be insufficient for protection in such demanding environments, and while 3 mil offers increased thickness, it could lead to other complications, such as weight addition and potential application issues. The 1.5 mil thickness can also fall short of providing the necessary protective barrier, reinforcing why 2 mil is the established standard.