This standard specifies the classification and marking, requirements, test methods, inspection rules, marking, packaging, transportation and storage of marine manhole covers (referred to as manhole covers). This standard applies to the design, manufacture and acceptance of manhole covers for steel ships.
CB/T 4392-2014 Referenced Document
GB 712-2011 Ship and ocean engineering structural steel
GB/T 8923.1-2011 Preparation of steel substrates before application of paints and related products.Visual assessment of surface cleanliness.Part 1:Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coa