What type of manuals are referred to in NSTM CH 631?

The reference to NSTM (Naval Ship's Technical Manual) Chapter 631 specifically pertains to technical manuals for ship preservation. This chapter is crucial for ensuring the proper maintenance, protection, and longevity of naval vessels through adequate preservation practices. The guidelines established in this chapter directly relate to the application of coatings, surface preparation, and other protective measures necessary to maintain the integrity of the ship's structure and systems. Understanding these preservation techniques is essential for maintaining the operational capability and safety of naval ships in various environments.

In contrast, the other options focus on different aspects of naval operations, such as weaponry, navigation, and engine performance, which are covered under separate manuals and not under NSTM Chapter 631. This chapter uniquely addresses the preservation needs of ships, making it essential knowledge for paint inspectors working within the naval framework.