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River Crossing Inspections-Balancing Risk with the Need to Obtain Advanced Pipeline Condition Assessment Data

机译：河流横穿检查 - 平衡风险需要获得先进的管道条件评估数据

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Increasing regulatory pressure to prevent inadvertent spills of both chlorinated water and wastewater to the environment has resulted in a drive by municipalities across North America to inspect and quantify the condition of their river crossing inventory. Estimating remaining service life requires the use of both structural assessments and deployment of advanced condition assessment technologies, including sonar, closed circuit television (CCTV), and advanced electromagnetics tools. River crossings pose a unique challenge for condition assessment programs as they are highly critical assets subject to unique operating conditions and are often difficult to access for both inspection and repair. Deploying inline inspection tools can require extensive system modifications and are often located in environmentally, geotechnical, and socially sensitive areas such as river banks and mature neighborhoods. As a result, developing a river crossing inspection program requires extensive planning, assessments of system hydraulics, pipelines access, geotechnical conditions, and contingency planning. Lack of system redundancy often makes removal from service difficult, if not impossible and planning system modifications and inspections requires reviewing system operations as a whole in addition to localized flow control requirements. Inspection of both gravity and pressure pipelines requires review of a myriad of potential operations to permit both system modifications and the inspection work itself. These include: upstream system storage, lift station shutdowns, pressure drops, and flow reversals in looped water systems, etc. As a result, extensive hydraulic modeling and coordination with system operators is required to develop flow control plans permitting necessary system modifications and tool deployment. This paper outlines the authors approach to developing advanced river crossing inspection programs addressing pressure and gravity system hydraulics, system modifications, tool deployment, and procurement of inspection and support contractors.
机译：增加监管压力，以防止氯化水和废水对环境的无意中的泄漏导致北美市政当局推动，以检查和量化河流过境库存的状况。估算剩余的服务生活需要使用结构评估和部署先进状态评估技术，包括声纳，闭路电视（CCTV）和高级电磁工具。河流交叉对条件评估计划构成了独特的挑战，因为它们是以独特的操作条件而受到独特的关键资产，并且往往难以接受检查和维修。部署内联检查工具可能需要广泛的系统修改，并且通常位于环境，岩土和社会敏感区域，如河岸和成熟社区。因此，开发河流过境检验计划需要广泛的规划，系统液压，管道访问，岩土工程和应急计划的评估。缺乏系统冗余通常会使服务困难，如果不是不可能和规划系统的修改和检查，还需要在局部流量控制要求中审查系统操作。检查重力和压力管道需要审查无数的潜在行动，以允许系统修改和检查本身。这些包括：上游系统存储，升降站停机，压降和环状水系统中的流量倒塌等，因此，需要广泛的液压建模和与系统运营商的协调开发流量控制计划允许必要的系统修改和工具部署。本文概述了提出先进河流交叉检查计划的作者方法，解决压力和重力系统液压，系统修改，工具部署以及检验和支持承包商采购。

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