This document establishes the mandatory safety requirements for the closing of openings in hulls and watertight bulkheads on merchant ships to ensure vessel integrity. The regulations were issued by the government of Great Britain to standardize safety protocols across the merchant fleet. The text provides the legal framework for structural maintenance and operational procedures regarding watertight integrity in accordance with international maritime safety conventions.

This text serves as a foundational regulatory document for maritime engineers and shipping compliance officers. Experts highlight the technical precision of the language as necessary for maintaining legal and safety standards within the industry.