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首页> 外文会议>Proceedings of the ASME India oil and gas pipeline conference 2013 >INTEGRITY ASSESSMENT OF NON-PIGGABLE PIPELINE THROUGH DIRECT ASSESSMENT
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INTEGRITY ASSESSMENT OF NON-PIGGABLE PIPELINE THROUGH DIRECT ASSESSMENT

机译：通过直接评估非管道的完整性评估

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Managing the integrity of pipeline system is the primary goal of every pipeline operator. To ensure the integrity of pipeline system, its health assessment is very important and critical for ensuring safety of environment, human resources and its assets. In long term, managing pipeline integrity is an investment to asset protection which ultimately results in cost saving. Typically, the health assessment to managing the integrity of pipeline system is a function of operational experience and corporate philosophy. There is no single approach that can provide the best solution for all pipeline system. Only a comprehensive, systematic and integrated integrity management program provides the means to improve the safety of pipeline systems. Such programme provides the information for an operator to effectively allocate resources for appropriate prevention, detection and mitigation activities that will result in improved safety and a reduction in the number of incidents. Presently GAIL (INDIA) LTD. is operating & maintaining approximately 10,000Kms of natural gas/RLNG/LPG pipeline and HVJ Pipeline is the largest pipeline network of India which transports more than 50% of total gas being consumed in this country. HVJ pipeline system consists of more than 4500 Kms of pipeline having diameter range from 04" to 48", which consist of piggable as well as non-piggable pipeline. Though, lengthwise non-piggable pipeline is very less but their importance cannot be ignored in to the totality because of their critical nature. Typically, pipeline with small length & connected to dispatch terminal are non-piggable and these pipelines are used to feed the gas to the consumer. Today pipeline industries are having three different types of inspection techniques available for inspection of the pipeline. 1. Inline inspection 2. Hydrostatic pressure testing 3. Direct assessment (DA) Inline inspection is possible only for piggable pipeline i.e. pipeline with facilities of pig launching & receiving and hydrostatic pressure testing is not possible for the pipeline under continuous operation. Thus we are left with direct assessment method to assess health of the non-piggable pipelines. Basically, direct assessment is a structured multi-step evaluation method to examine and identify the potential problem areas relating to internal corrosion, external corrosion, and stress corrosion cracking using ICDA (Internal Corrosion Direct Assessment), ECDA (External Corrosion Direct Assessment) and SCCDA (Stress Corrosion Direct Assessment). All the above DA is four steps iterative method & consist of following steps; a. Pre assessment b. Indirect assessment c. Direct assessment d. Post assessment Considering the importance of non-piggable pipeline, integrity assessment of following non piggable pipeline has done through direct assessment method. 1. 30 inch dia pipeline of length 0.6 km and handling 18.4 MMSCMD of natural gas 2. 18 inch dia pipeline of length 3.65 km and handling 4.0 MMSCMD of natural gas 3. 12 inch dia pipeline of length 2.08 km and handling 3.4 MMSCMD of natural gas In addition to ICDA, ECDA & SCCDA, Long Range Ultrasonic Thickness (LRUT-a guided wave technology) has also been carried out to detect the metal loss at excavated locations observed by ICDA & ECDA. Direct assessment survey for above pipelines has been conducted and based on the survey; high consequence areas have been identified. All the high consequence area has been excavated and inspected. No appreciable corrosion and thickness loss have observed at any area. However, pipeline segments have been identified which are most vulnerable and may have corrosion in future.
机译：管理管道系统的完整性是每个管道运营商的主要目标。为了确保管道系统的完整性，其健康评估对于确保环境，人力资源及其资产的安全非常重要且至关重要。从长远来看，管理管道完整性是对资产保护的投资，最终可以节省成本。通常，对管道系统完整性进行管理的运行状况评估是运营经验和公司理念的函数。没有一种方法可以为所有管道系统提供最佳解决方案。只有全面，系统和集成的完整性管理程序才能提供改善管道系统安全性的方法。这样的程序为操作员提供了信息，以有效地将资源分配给适当的预防，检测和缓解活动，从而提高安全性并减少事故数量。现为盖尔（印度）有限公司。正在运营和维护约10,000公里的天然气/ RLNG / LPG管道，HVJ管道是印度最大的管道网络，其运输的天然气总量占该国消耗量的50％以上。 HVJ管道系统由超过4500 Kms的管道组成，直径范围从04“到48”，包括可清管和不可清管。虽然纵向不可固定的管道非常少，但是由于它们的关键性，它们的重要性不能被整体忽略。通常，长度短且连接到调度终端的管道是不可固定的，这些管道用于将天然气输送给用户。如今，管道行业拥有三种不同类型的检查技术可用于管道检查。 1.在线检查2.静水压测试3.直接评估（DA）在线检查仅适用于可清管的管道，即具有清管装置的管道，连续运行的管道不能进行静水压测试。因此，我们只剩下直接评估方法来评估不可固定管道的运​​行状况。基本上，直接评估是一种结构化的多步骤评估方法，可使用ICDA（内部腐蚀直接评估），ECDA（外部腐蚀直接评估）和SCCDA来检查和识别与内部腐蚀，外部腐蚀和应力腐蚀裂纹有关的潜在问题区域（应力腐蚀直接评估）。以上所有DA是四个步骤的迭代方法，包括以下步骤：一个。预评估b。间接评估c。直接评估d。事后评估考虑到非固定管道的重要性，后续的非固定管道的完整性评估是通过直接评估方法进行的。 1.直径为0.6 km的30英寸直径管道，可处理18.4 MMSCMD天然气2.长度为3.65 km的18英寸直径管道，可处理4.0 MMSCMD天然气3.长度为2.08 km的12英寸直径的管道，可处理3.4天然气气体除了ICDA，ECDA和SCCDA外，还进行了远程超声波测厚（LRUT-导波技术），以检测ICDA和ECDA观测到的挖掘位置的金属损失。已经对上述管道进行了直接评估调查，并以此为依据；确定了高后果区域。所有高风险区域均已开挖和检查。在任何区域都没有观察到明显的腐蚀和厚度损失。但是，已经确定了最脆弱的管道段，将来可能会腐蚀。

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