海底双层保温管道系统最终压力测试接受标准的探讨

Discussion of Final Pressure Testing Acceptance Standard for Subsea Insulated Pipe-in-Pipe System

海底管道系统最终验收时间的长短直接关系到施工资源的投入和管道的投产时间,因此在保证管道建设质量的前提下,更快地完成海底管道的验收工作一直是施工方与油田方共同追求的目标。在最终验收的压力测试环节,随着我国海底管道工程向深水方向发展,海底管道的压力测试施工时间呈现出越来越长的趋势,海底双层保温管道压力测试施工的时间增加尤为显著。为缩短管道的压力测试时间,根据双层海管内介质温度与压力的变化关系,结合南海部分项目的实际压力测试情况,通过分析、对比温降和压降的变化情况,对现行的最终压力测试接受标准进行了探讨,提出了新的压力测试接受标准。

The time period for final acceptance of subsea pipeline system influences directly the involved construction resources and the pipeline official operation time, so completing the pipeline acceptance work in a shorter time is a common aim for client and contractor under the precondition of ensuring pipeline construction quality. As the development of subsea pipeline projects tends to deep water, the pipeline pressure test time in final acceptance work becomes longer, especially for pipe-in-pipe(PIP) system. However the practice proves that PIP system which has the normal pressure drop graph doesn’t leak. To shorten the pipeline pressure testing time, this paper, based on the relationship between temperature and pressure of the medium in PIP system and combined with the pressure test cases of some projects in South China Sea, discusses the present 'Final Pressure Testing Acceptance Standard' through analysis and comparison of the temperature drop and pressure drop, and suggests a new criterion.