Numerical analysis of cathodic protection of a Q355ND frame in a shallow water subsea Christmas tree

IF 2.4 4区材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Testing Pub Date : 2024-07-15 DOI:10.1515/mt-2023-0394

Shaodong Ju, Yuming Liu, Qishuai Yin, Xing Wang, Shiqiang Wang, Zitao Jiang, Siyao Deng

引用次数: 0

Abstract

This study develops a 3D model of a Christmas tree using cathodic protection technology and conducts numerical simulations on the Q355ND framework of a shallow Christmas tree. The boundary element method is employed for modeling, examining the distribution of protection potentials under varying corrosion layer breakage rates, anode numbers, and positions. The influence of sacrificial anode parameters on the cathodic protection effect of the Christmas tree is also investigated. The findings reveal that when the breakage rate of the anticorrosion layer reaches 35 % during Christmas tree operation, the sacrificial anode fails to provide complete protection. However, if the coating breakage rate is 10 %, reducing the number of anodes by six can still achieve a protection potential of −850 mV. Thus, it is imperative for Christmas trees to maintain a corrosion protection layer breakage rate below 35 %. Beyond this threshold, sacrificial anodes exhibit minimal effectiveness in preserving their integrity.

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浅水海底圣诞树中 Q355ND 框架的阴极保护数值分析

本研究利用阴极保护技术开发了圣诞树的三维模型，并对浅层圣诞树的 Q355ND 框架进行了数值模拟。采用边界元法进行建模，研究了不同腐蚀层断裂率、阳极数量和位置下的保护电位分布。此外，还研究了牺牲阳极参数对圣诞树阴极保护效果的影响。研究结果表明，在圣诞树运行过程中，当防腐层破损率达到 35% 时，牺牲阳极无法提供完全保护。然而，如果涂层破损率为 10%，减少 6 个阳极仍可达到 -850 mV 的保护电位。因此，圣诞树必须将防腐层破损率保持在 35% 以下。超过这个临界值，牺牲阳极在保持其完整性方面的效果就微乎其微了。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Testing 工程技术-材料科学：表征与测试

CiteScore

4.20

自引率

36.00%

发文量

165

审稿时长

4-8 weeks

期刊介绍： Materials Testing is a SCI-listed English language journal dealing with all aspects of material and component testing with a special focus on transfer between laboratory research into industrial application. The journal provides first-hand information on non-destructive, destructive, optical, physical and chemical test procedures. It contains exclusive articles which are peer-reviewed applying respectively high international quality criterions.