institute classification clause meaning in English

协会船级条款

Essel should not be more than 15 years of age and is subject to institute classifications clauses
译文：以（英国伦敦）学会船级条款为条件，船只不应该超过15年船龄。
Vessel should not be more than 15 years of age and is subject to institute classifications clauses
译文：以（英国伦敦）学会船级条款为条件，船只不应该超过15年船龄。
A certificate issued by the carrier of issuer of the transport document ( b / l ) certifying that the carrying vessel per institute classification clause and is plying on a regular liner service
出具提单的承运人签发证明,证明船只符合分级要求,一直从事固定航线服务
Certificate from the shpping company that the vessel is registered with an approved classification society as per the institute classification clause and class maintained equivalent to lloyds 100 a1
证明船舶已在经批准的船舶定级机关依照船级条款和等同于劳氏规范100a1 .船级保持条款注册的船公司证明。