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首页> 外文期刊>Anti-Corrosion Methods and Materials >Failure investigation of stainless steel piping in a sulphur recovery unit of a gas-processing plant
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Failure investigation of stainless steel piping in a sulphur recovery unit of a gas-processing plant

机译：气体处理厂硫磺回收装置中不锈钢管道的故障调查

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Purpose - This paper seeks to determine the causes and mechanism of failure of stainless steel piping in a sulphur recovery unit of a gas-processing plant and to recommend suitable measures to avoid recurrences. Design/methodology/approach - The integrity of the material of construction was verified using various laboratory and analytical techniques. Standard metallographic techniques were used to prepare representative samples obtained from failed stainless steel piping for metallurgical evaluation. Microstructural characterization was carried out in an inverted metallurgical microscope equipped with an imaging facility. Elemental analysis and hardness were used to confirm the identification of the material. Corrosion product/deposits were analyzed using wet chemistry supported by X-ray diffraction analysis. Microbes were enumerated through standard methods. Findings - The piping failed due to severe pitting corrosion, which resulted in the formation of holes. Microbial-induced corrosion (MIC) and underdeposit corrosion were chief contributing factors that caused the failure in stainless steel piping. In addition, the HAZ near welds at some places was found to be sensitized causing accelerated pitting corrosion at these sites. Practical implications - The expected service life of stainless steel piping could not be realized as the piping failed due to the combined effect of MIC and under-deposit corrosion. Periodic monitoring of sulphate-reducing bacteria and sulphur-oxidizing bacteria coupled with implementation of an effective biocide treatment programme in process fluid was recommended, together with the introduction of a procedure for frequent cleaning of the pipe walls to minimize under-deposit attack. Originality/value - The paper - a technical case study of process industry - provides an account of failure investigation. It identifies the causes and mechanism of failure and suggests suitable preventive and corrective measures. This is useful industrial experience that provides valuable information for process and plant corrosion engineers involved in the operation of this type of equipment.
机译：目的-本文旨在确定气体处理厂硫磺回收装置中不锈钢管道故障的原因和机理，并提出适当的措施以避免再次发生。设计/方法/方法-使用各种实验室和分析技术验证了建筑材料的完整性。标准的金相技术用于制备从不合格的不锈钢管道中获得的代表性样品，以进行冶金评估。显微结构表征是在配有成像设备的倒置金相显微镜中进行的。元素分析和硬度用于确认材料的鉴定。使用X射线衍射分析支持的湿化学方法分析腐蚀产物/沉积物。通过标准方法对微生物进行计数。发现-管道由于严重的点蚀而破裂，导致孔的形成。微生物引起的腐蚀（MIC）和沉积不足的腐蚀是造成不锈钢管道故障的主要因素。另外，发现某些地方焊缝附近的热影响区很敏感，导致这些部位的点蚀加速。实际意义-由于MIC和沉积不足腐蚀的综合作用导致管道失效，因此无法实现不锈钢管道的预期使用寿命。建议定期监测硫酸盐还原菌和硫磺氧化菌，并在过程流体中实施有效的杀菌剂处理程序，并建议采用经常清洗管壁的程序，以最大程度地减少沉积不足的侵害。原创性/价值-该论文-流程行业的技术案例研究-提供了故障调查的说明。它确定了故障的原因和机理，并提出了适当的预防和纠正措施。这是有益的工业经验，可为参与此类设备操作的过程和工厂腐蚀工程师提供有价值的信息。

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