Shipbuilding; Manholes with bolted covers

This technical specification addresses the design and construction requirements for access openings secured by bolted covers in shipbuilding applications. It establishes precise geometric dimensions, material specifications, and assembly procedures necessary to ensure watertight integrity and structural reliability throughout the vessel's service life. The document outlines the necessary tolerances for flange surfaces and bolt holes, detailing the sequence for tightening fasteners to achieve uniform clamping forces. By defining standard interfaces between the cover and the hull or bulkhead structure, it facilitates interchangeability of components across different manufacturing facilities and shipyards worldwide. Adherence to these guidelines ensures that access points meet consistent safety and performance benchmarks regardless of the specific vessel type or construction location. The text focuses exclusively on the technical attributes of the opening and its securing mechanism, providing a foundational reference for engineers and fabricators involved in creating durable marine structures.