深水FPSO的牺牲阳极阴极保护系统设计  

Design of Cathodic Protection System Using Sacrificial Anode for Deep Water FPSO

作　　者：张美荣[1] 徐田甜 高德欢 梁健[1] ZHANG Meirong;XU Tiantian;GAO Dehuan;LIANG Jian(China Offshore Oil Engineering Company,Tianjin 300451,China;Tianjin Branch,CNOOC(China)Limited,Tianjin 300452,China;CNOOC Safety Technology Service Co.,Ltd.,Tianjin 300452,China)

机构地区：[1]海洋石油工程股份有限公司,天津300451 [2]中海石油(中国)有限公司天津分公司,天津300452 [3]中海油安全技术服务有限公司,天津300452

出　　处：《腐蚀与防护》2023年第5期83-90,95,共9页Corrosion & Protection

摘　　要：浮式生产储卸油装置(FPSO)的船体阴极保护系统是确保结构安全的重要系统。以某深水FPSO船体阴极保护系统为例,介绍其所属石油公司企业标准对海上浮式装置的牺牲阳极阴极保护的技术要求。FPSO总体设计采用了油舱段被“干式安全带”围绕保护的设计理念,减少FPSO船舱内部阳极的用量。基于DNV规范和企业标准要求,考虑腐蚀环境影响、阴极极化过程、阳极消耗、防腐蚀涂层破损和船舱内有限布置空间等因素,选定铝合金牺牲阳极的成分和尺寸;计算FPSO船体和水下悬挂设施所需的保护电流密度,确定FPSO船舱内部和舷外的阳极用量和布置,以满足FPSO船体28 a全寿命期内不进坞维修的设计要求。The cathodic protection system is important for ensuring safety of floating production storage and offloading(FPSO)hull structure.Taking the cathodic protection system of a deep water FPSO hull as an example,the technical requirements of cathodic protection system using sacrificial anode for offshore floating units was introduced in the oil company′s general specifications.The general design of the FPSO incorporated the concept that the oil tank section was embraced and protected by a“dry safety belt”for reducing the consumption of anodes in FPSO tank.The composition and size of aluminum alloy sacrificial anode were selected considering the influence of corrosion environment,cathodic polarization process,consumption of sacrificial anode,breakdown of coating and limited arrangement space in tank based on the DNV rules and oil company′s general specifications.In order to meet the design requirement of FPSO hull without dock maintenance during it whole life of 28 a,the protection current density required by FPSO hull and underwater hanging facilities was calculated to determine the amount and arrangement of sacrificial anodes in the FPSO tank and outboard shell.

关 键 词：浮式生产储卸油装置 原油舱 压载水舱 阴极保护 牺牲阳极 

分 类 号：U672.72[交通运输工程—船舶及航道工程] TG174[交通运输工程—船舶与海洋工程]