Turbine lagging pads must be verified as non-asbestos using what guidance?

The correct choice for verifying that turbine lagging pads are non-asbestos is NSTM 635. This Manual describes the specific materials and practices related to shipboard insulation, including guidelines on verifying the asbestos content of lagging materials. It emphasizes the importance of safety procedures and material handling protocols that are essential to ensure compliance with environmental and health standards.

Using NSTM 635 for this purpose helps to ensure that all insulation materials on board are safe for use and comply with established safety regulations, thereby protecting personnel from the hazards associated with asbestos exposure. This aligns with the Navy's commitment to minimizing exposure to hazardous materials and ensuring a safe working environment for all personnel involved in maintenance and repair operations on board ships.

The other options, while relevant to various safety and operational standards, do not specifically cover the verification of asbestos content in turbine lagging pads like NSTM 635 does, making it the authoritative source for this specific need.