Damage Assessment and Reparation Method for Injured Submarine Lined Pipes
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摘要: 复合管海底管道在铺设过程中发生破断后,316L/625衬管暴露于海水或含有泥沙的海水中,可能发生腐蚀破坏。根据316L/625材料的腐蚀速率、管壁厚度和允许的最大点蚀深度来预估复合管允许的浸泡期限。如果破损的管道能在允许的浸泡期限内完成修复作业,则该管道可视为累积损耗而非失效,修复后仍可继续服役。修复方法为,切除破损管段后,排出海底管道内的海水,用含(300—500)×10-6除氧剂、杀菌剂和缓蚀剂的淡水清洗316L/625管壁上残留的氯化物和溶解氧,清洗淡水的Cl-浓度宜小于200×10-6。并根据腐蚀与污损情况确定是否需要进行酸液清洗。
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关键词:
- 316L/625复合钢管 /
- 腐蚀 /
- 失效评估 /
- 修复
Abstract: Submarine pipeline was injured during the laying process, the 316 L/625 lined pipes was exposed to the seawater or seawater with sediment, and local corrosion probably happened. The corrosion rate, tube thickness and allowance pitting penetration of the 316 L/625 lined pipes were used to evaluate the allowance immersion time. If the pipeline was repaired before the deadline, the corroded 316 L/625 pipes was considered as accumulating loss, not damage. Reparation method:cut out the injured pipeline and release seawater. (300-500) × 10-6 inhibitor with oxygen scavenger and pesticide was immersed into fresh water, which was then used to wash the 316 L/625 pipes to clean the chloride and dissolved oxygen. The content of Cl- in the fresh water should be less than 200 ppm. The use of acid cleaning was dependent on the corrosion and fouling.-
Key words:
- 316L/625 lined pipe /
- corrosion /
- failure evaluation /
- reparation
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