船舶入级(classification)是评定船舶技术状态的重要手段，海上营运船舶必须入级。国际著名船级社包括德国GL、英国LR、法国BV、美国ABS、挪威DNV、日本NK、韩国KR、印度IRS、中国CCS、意大利RINA、俄罗斯RS等。
‘船级’是指：上文提到的船舶入级符号。
目前民用船舶结构设计主要是依据船舶入级与建造规范进行的。
At present, civil ship structures are mostly designed by the rules.
其合同（涉及所有船舶）日期和船舶建造工程号（如船厂编号）应由申请建造入级的申请方向入级船级社提出书面声明。
This date and construction iers (i e Hull Numbers) of all vessels include the contract are to be declared to the classification by the party applying assignment of class for a new building.
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