ISO 16858:2013 pdf download.Ships and marine technology一Loose gear of lifting appliances on ships-Pulleys.
ISO 16858 specifies the structural types, basic parameters, technical requirements, test methods, inspection rules, marking, storage, and transportation of sheaves, loose gear of lifting appliances on ships.
This International Standard is applicable to hot-rolled sheaves of lifting appliances on ships.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
5.2 Ranges
For the ranges of sheaves, see Annex A.
5.3 Process
5.3.1 Rims and web
The rims and web of sheaves shall be manufactured from a single steel piece, with groove produced by hot rolling process.
5.3.2 Welding and weld
5.3.2.1 Welding materials used for sheaves shall match the strength of welded materials, in accordance with International Standards.
5.3.2.2 The rims and hubs of sheaves shall be welded with groove weld, with double groove preferred. The types of weld shall be in accordance with the related provisions of ISO.
5.3.2.3 The appearance shall have no quality defects such as steel pits, splashes, slag, undercuts, and surface cracks after welding.
5.3.2.4 After welding of rims and hubs, and before machining of sheaves, the sheave weld shall be adequately stabilized through thermal or vibratory stress relief, to ensure dimensional stability.
5.3.3 Surface treatment
5.3.3.1 The surface roughness of rope grooves shall not be less than 12,5; their surface hardness shall be HB260 minimum.
5.3.3.2 Machining positions of sheaves and open positions such as spacer sleeves shall be painted with antirust oil to prevent corrosion; non-machining positions shall be painted with antirust paint after the surface removal of rust.
5.4 Assembly requirements
5.4.1 Components can be assembled only after they pass tests.
5.4.2 Rolling bearings shall be cleaned before assembly, with clean, rustless, and burr-free contact surface.
5.4.3 The fit between outer rings of rolling bearings and hubs of sheaves is N7; the fit between inner rings and shafts is n6.
5.4.4 After assembly, sheaves can turn flexibly around the shaft without blocking, when manually moved.
5.5 Accuracy requirements
5.5.1 For the requirements on the limit deviation of outside diameter D1, see Table 2.ISO 16858 pdf download.