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The correct chapter that addresses safety protocols for confined spaces in OPNAVINST 5100.23 Series is Chapter 27. This chapter specifically outlines the requirements, procedures, and safety practices necessary when working in confined spaces to minimize the risks and hazards associated with these potentially dangerous areas. It covers critical topics such as hazard identification, ventilation requirements, personal protective equipment, and emergency procedures, which are essential for ensuring the safety of personnel entering or working within confined spaces.

Understanding the content of this chapter is crucial for compliance with safety regulations and for protecting the well-being of workers. Confined spaces can pose serious risks, including oxygen deficiency, harmful atmospheres, and the potential for engulfment or entrapment. Therefore, thorough training and adherence to the guidelines in Chapter 27 are vital components of an effective safety program in environments where confined spaces are present.