What is the main focus of NSTM associated with hull fittings?

The main focus of NSTM (Naval Ships' Technical Manual) associated with hull fittings is structural integrity. Hull fittings are critical for maintaining the stability and strength of a vessel, ensuring that it can withstand various stresses encountered during operation. This includes the stress from water pressures, impacts, and dynamic loads that occur while the ship is in motion or at rest. Proper attention to structural integrity helps prevent dangerous situations, such as leaks or structural failures, which can lead to significant risks for the ship and crew.

Focusing on structural integrity involves not just understanding the materials and designs used for hull fittings but also ensuring that these components are installed correctly and maintained throughout the ship's life. This is essential for operational safety and longevity of the vessel. While surface treatment, sealing components, and operational guidelines are important aspects of hull maintenance and function, they serve more as supportive elements to the overarching goal of maintaining the integrity of the ship’s structure.