许多加工厂，如炼油厂、化工厂和发电厂，不仅在日本，而且在其他工业国家都经历了长达40多年的运行。这意味着这些电厂的设备维护已成为确保电厂安全可靠运行的关键技术。因此，补焊的作用在更大程度上增加了，这就要求开发推荐的系统和实用补焊实践。作为该委员会的主要活动之一，化工厂焊接研究委员会（以下简称委员会）于1983年发布了《补焊工艺指南》，并于1993年对其进行了修订。由于上一次修订已经过去了10多年，行业强烈要求更新指南，等待包括实用知识在内的高级问题- 你好。在此背景下，委员会于2001年成立了压力设备补焊工作组，并于2004年晋升为压力设备补焊小组委员会（由E.Yamamoto担任主席）。该小组委员会由35名合格工程师组成，包括最终用户、材料供应商、设备制造商、工程施工人员、，维护和检查协调员制作“补焊示例”和“与补焊相关的技术数据表”“可用于压力设备补焊的研究和实施。在活动的第一阶段，小组委员会通过调查100多篇文献，建立了补焊技术数据库的基础。此外，小组委员会还审查了日本和包括美国在内的其他国家与压力设备补焊相关的法规、规范和标准的最新状况我和API。 在2004年开始的第二阶段活动中，？补焊指南？作为工程参考，包括对损坏状态和原因的分析、通过服务适用性（FFS）评估对设备进行诊断、对补焊必要性和可用性的研究、补焊实践和补焊后维护。该活动的成果已逐年在全国研讨会上发布，并在ASME-PVP等国际会议上展示，引起了广泛关注。2009年，这些活动被汇编成一本手册，即委员会发布的CP-0902《炼油厂和化工厂压力设备补焊指南》，作为第一本实用补焊指南。CP-0902的内容在ASME的六篇论文中介绍- 2011年在马里兰州巴尔的摩举行的PVP会议，其中一部分是在2012年在英国伦敦举行的ICPVT-13会议上宣布的。此外，PVP会议论文摘要于2013年发表在《ASME压力容器技术杂志》上。炼油厂和石化行业强烈要求在役压力设备的补焊规范标准化。根据这些需求，委员会在施工后维护的补焊标准化方面发挥了重要作用。该产品于2012年7月发布为日本焊接工程学会标准WES 7700《压力设备的补焊》WES 7700由4部分组成:第1部分概述、第2部分缺陷挖掘和补焊、第3部分对接焊接插入板和第4部分外部角焊补片。 后续工作正在进行中，以在行业和相关监管机构推广WES 7700。工厂设备的维护标准主要包括三个检查、评估和维修规范。虽然服务适用性（FFS）评估和基于风险的检查（RBI）的程序已经提前标准化，但缺陷修复方法的标准化尚未得到很好的发展。本指南的发布将对世界工厂设备的安全运行做出重大贡献。委员会已经出版了一本英文版的手册CP-0902E，“炼油厂和化工厂压力设备补焊指南”，用于工艺厂压力设备的维护。该委员会致力于开发和改进压力设备的补焊技术，感谢世界各行业工程师对我们活动的合作和热情支持。

Many process plants such as refineries, chemical plants and power plants have undergone the operation as long as more than forty years not only in Japan but also in other industrial countries. It means that the equipment maintenance of these plants has emerged as a key technology for ensuring the safe and reliable operation of plants. Consequently, the role of repair welding has increased to a larger extent, causing a great demand for the development of recommended systematic and practical practices of repair welding.The Chemical Plant Welding Research Committee, hereafter called the Committee, issued "Guideline for Repair Welding Procedure" in 1983 and revised it in 1993, as one of the main activities of the Committee. Since it has been more than 10 years after the last revision, the renewal of the Guideline is strongly requested by the industries waiting for an advanced issue including practical know-hows.With this background, the Working Group for Repair Welding of Pressure Equipment was launched in 2001 in the Committee, and advanced to the Subcommittee on Repair Welding for Pressure Equipment (Chaired by E. Yamamoto) in 2004. The Sub-committee was set up with 35 members of qualified engineers including end users, material suppliers, equipment fabricators, engineering constructors, maintenance and inspection coordinators to make "Examples of repair welding" and 'Technical data sheets related to repair welding" which can be used in the study and performance of repair welding of pressure equipment.In Phase I of the activity, the Sub-committee formed a basis for technical database of repair welding by surveying more than 100 literatures. In addition, it reviewed the latest status of regulations, codes and standards related to repair welding of pressure equipment in Japan and other countries including ASME and API.In Phase II of the activity which started in 2004,?Guidelines for repair welding?was made as an engineering reference including the analysis of the state and cause of damage, the diagnosis of equipment by fitness-for-service (FFS) assessment, the study on the necessity and availability of repair welding, the practice of repair welding and post-repair maintenance. The product of the activity has been released at the National Symposium year by year, and also presented at the international conferences such as ASME-PVP with remarkable attentions.In 2009, the activities were compiled into one handbook, Committee issue CP-0902, 'Guidelines for Repair Welding of Pressure Equipment in Refineries and Chemical Plants" as the first practical repair welding guideline. The contents of CP-0902 were presented in six papers at ASME-PVP Conference, Baltimore, ML in 2011, and a part of them was announced at ICPVT-13 Conference, London, UK in 2012. Furthermore, the summary of the PVP conference papers was published in ASME Journal of Pressure Vessel Technology in 2013.Oil refinery and petrochemical industries have strongly called for the standardization of repair welding practices of pressure equipment in service. In compliance with these needs, the Committee has played an important role in the standardization of repair welding for post-construction maintenance. The product was published in July 2012 as the Japan Welding Engineering Society Standard, WES 7700 "Repair Welding of Pressure Equipment." WES 7700 consists of 4 Parts: Part 1 General, Part 2 Flaw excavation and repair welding, Part 3 Butt-welded insert plates and Part 4 External fillet welded patches. The follow-up works are under progress to promote WES 7700 in the industries and related regulatory bodiesThe maintenance standards for plant equipment primarily consist of three specifications for inspection, assessment and repair. Although the procedures for fitness-for-service (FFS) assessment and risk-based inspection (RBI) have been standardized in advance, the standardization of flaw repair methods has not been well developed. The issue of this guideline will form a substantial contribution to the safe operation of plant equipment in the world.The Committee has published an English version of the handbook, CP-0902E, "Guidelines for Repair Welding of Pressure Equipment in Refineries and Chemical Plants" for the maintenance of pressure equipment in process plants.The Committee, which exerts efforts to develop and improve the repair welding technologies for pressure equipment, appreciates the cooperation and cordial support for our activities from the engineers in various industries worldwide.