译文：
按照酒泉钢铁(集团)有限公司动力厂新建3套21000m3/h空分设备项目的要求,在工程中需要将原有6000m3/h空分设备与新建的3套21000m3/h空分设备的氧气、氮气和氩气等管网互相连通,便于公司内的气体平衡以及空分设备检修。在对氧气管道连接时,将6000m3/h空分设备活塞氧压机出口(入氧气球罐阀门前)与3套21000m3/h空分设备氧气球罐前管道相连,中间加装一段阻火管和氧气过滤器。连接管道采用管径Φ273mm×8mm的碳钢管道,中间联络阀采用4MPa、DN250mm的氧气专用截止阀。在联络阀前管道上安装了DN100mm普通截止阀作为氧气放散阀,阀门竖直向上安装,根部距离管道约10cm,且根部没有加颈固定,阀门上部放空口向上引出约80cm。 1故障现象 氧气管道连接后正常运行约1年,就出现了泄漏现象。 (1)DN250mm氧气专用截止阀关闭不严。虽然关闭了阀门,但在下游侧法兰处气体泄漏较大。 (2)DN100mm氧气放散阀根部开裂。主要原因是由于该段管道恰好位于活塞氧压机出口段,振动较大,长期振动致使阀门底部连接管道与主管道连接处开裂,中压氧气大量放散,安全隐患较大。 由于生产主线用氧量较大,且在3套21000m3/h空分设备侧没有安装阀门将其供应氧气管网的气源切断,暂时没有时间排除此安全隐患。于是临时制作了一个钢制卡子,对氧气管道放散处进行了临时处理,并在周围10m范围内设置了临时警戒区域。 2处理措施和过程 制氧工序的检修一直与炼钢、炼铁和不锈钢等主线工序的检修同步进行。根据公司检修计划,于2006年9月27日对上述安全隐患进行处理,具体处理措施为: (1)将原DN250mm氧气专用截止阀作为一段管道使用,阀门常年处于开启状态;并紧固两侧法兰,确保法兰连接处不泄漏氧气。在管道上重新加装一个压力为614MPa的DN250mm氧气专用截止阀,将此阀门作为平时操作用切断阀(中间联络阀)。 (2)补焊放散管道开裂处,并对此段管道和阀门进行固定;更换6000m3/h空分设备送氧管道三通阀。 施工前,准备了相关材料和备件,并将氩弧焊机、倒链等设备运至现场,提前对新增氧气联络阀进行脱脂、打压,对Φ273mm×8mm碳钢管道、90°不锈钢三通阀、45°弯头和45°Y形三通阀进行除锈、脱脂,并打磨坡口。根据管道施工现场情况,在管道切割处及新增氧气联络阀处,制作可移动检修平台或搭建脚手架。提前制作新增氧气联络阀盲板。在新增氧气联络阀进气侧法兰上焊接长度约115m的不锈钢管道,不锈钢管道另一端焊接一个4MPa、DN250mm的法兰。提前切除原4MPa、DN250mm氧气联络阀北侧、东侧支架横梁,并将需拆除管道下部的钢板切除,同时对平台设置必要支撑,保证切除的管道能够垂直落下。用12mm钢板制作原氧气联络阀盲板,盲板外径略大于法兰外径,盲板上根据法兰螺丝孔尺寸打眼,并攻丝。同时,为了防止一旦氧气管道内气体不能全部排除而造成事故,提前在现场准备2台鼓风机,确保能及时对现场进行强制换风。提前松开6000m3/h空分设备4台氧压机送氧阀内侧法兰,并使送氧阀与法兰之间留有相应间隙,为联网管道提供吹除点。 施工中,按照卸压2小时、置换1小时、管道拆除6小时、新增阀门和管道加装6小时、吹扫1小时、打压查漏1小时和恢复送气(抽盲板和送气)1小时的程序进行施工组织,共计18小时。卸压、置换完毕后,施工人员在距离联网管道三通阀6m处的氧压机出口管道以及在6000m3/h空分设备送氧管道6m处,对管道进行斜口切割。并在以上两个切开处设置挡板,防止联络阀法兰拆开后氧气泄入管道。拆除原氧气联络阀6000m3/h空分设备侧法兰螺丝,脱开法兰,将盲板紧固在阀门法兰上,确保盲板不脱落。将拆除管道垂直落下后,为防止联络阀法兰拆开后氧气泄入管道,保留管道两斜口切开处设置的挡板,拆除原氧气联络阀盲板。将不锈钢短节以及法兰和新增的氧气联络阀(阀门处于全开状态)与原氧气联络阀法兰进行连接。确定法兰紧固后,缓慢关闭新增氧气联络阀,并在新增氧气联络阀的6000m3/h空分设备侧加设盲板。 施工完毕后,打磨原管道焊口,同时焊接氧压机出口管道上的Φ273mm×8mm、45°弯头以及送氧管道上的Φ273mm×8mm、45°Y形三通阀。焊接完毕后,检修人员在吊车的配合下,将新增氧气联络阀出口法兰(法兰提前与出口管道进行焊接)与阀门相连。连接完毕后,将出口管道另一端与45°Y形三通阀焊接,同时将氧压机出口管道与45°Y形三通阀焊接。 3实施效果 施工完毕后,进行恢复送气操作,拆除新增氧气联络阀盲板、氧气球罐盲板,恢复各氧压机送氧阀,打开新增氧气联络阀,用氧气对管道残余氮气进行置换。10分钟后,在管道放散处进xx体成分化验,合格后恢复正常送氧。此次氧气管道放散阀根部开裂处理及加装联络阀技术改造成功。 4结束语 这次安全隐患排除,在施工前一个月就着手开始人员、材料、机具和技术方案等准备。由于准备工作充分,对现场可能出现的各种情况提前进行针对性预防,实际施工进度xx可控,并比原计划完成施工时间略有提前。

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原文：
In accordance with the Jiuquan Iron and Steel (Group) Co., Ltd. power plant built 3 sets 21000m3 / h air separation plant project requirements, the project needs to be original 6000m3 / h air separation plant and the new 3 sets 21000m3 / h air separation plant oxygen nitrogen and argon and other pipelines connected with each other, to facilitate the company's gas balance and air separation equipment maintenance. In the oxygen pipeline connection will be 6000m3 / h air separation plant oxygen compressor piston exit (into the oxygen tank valve ago) and 3 sets 21000m3 / h air separation plant oxygen tank before the pipe connected to the middle of installing a Fire tube and oxygen filter. Connection pipe with diameter Φ273mm × 8mm carbon steel pipe, valves with intermediate contact 4MPa, DN250mm oxygen-specific cut-off valve. Contact the valve in the pipe before the valve is installed DN100mm common as oxygen relief valve, the valve installed vertically upward, the roots from the pipe of about 10cm, and the root is not fixed and neck, upper valve port shorting leads up about 80cm. A failure phenomenon After the normal operation of the oxygen pipe to connect about a year, appeared in leakage. (1) DN250mm strictly oxygen-specific cut-off valve closed. Although the closure of the valve, but in the downstream side of the flange large gas leak. (2) DN100mm oxygen relief valve root cracking. Main reason is due to pipeline just in the export section of the oxygen compressor piston, vibration large, long-term vibration causing the valve connecting the bottom of the competent Road junction channels and cracking pressure of oxygen in a large number of elution, greater security risk. Greater use of oxygen as the main line of production, and in 3 sets 21000m3 / h air separation unit is not installed on the valve side to the oxygen supply cut off gas supply pipe network, no time to rule out the security risks. Then create a temporary steel clamp on the oxygen pipe elution Department conducted an interim deal with, and within around 10m to set up temporary warning area. 2 treatment measures and process Maintenance has been working with oxygen steelmaking process, iron and stainless steel main line maintenance processes simultaneously. According to the company maintenance program, on September 27, 2006 on the security risks are processed concrete action to: (1) the original DN250mm oxygen-specific section of pipe to use as a cut-off valve, the valve is turned on year round; and fastening flange on both sides to ensure the flange does not leak oxygen. In the pipeline to re-install a pressure of 614MPa for DN250mm oxygen-specific cut-off valve, this valve with a shut-off valve as a normal operation (contact center valve). (2) repair welding pipe cracking Bleeding Department, and this section is fixed pipes and valves; replacement of 6000m3 / h air separation plant oxygen delivery pipe three-way valve. Before the construction, preparation of relevant materials and spare parts, and welding machine, pour chain equipment to the scene, in advance of the new oxygen to contact the valve degreasing, pressure on the Φ273mm × 8mm carbon steel pipe, 90 ° stainless steel links valve, 45 ° elbow and 45 ° Y-shaped three-way valve for rust removal, degreasing, and polishing groove. Pipeline construction site under the circumstances, cut the pipe to contact the Department and the new oxygen valve, making mobile maintenance platform or build scaffolding. Early production of additional oxygen to contact the valve Blind. Add oxygen to contact the valve in the inlet side of the flange on the length of about 115m of stainless steel welded pipe, stainless steel pipe welding the other end of a 4MPa, DN250mm flange. Early removal of the original 4MPa, DN250mm oxygen to contact the valve the north, east support beams, and pipes need to remove the lower part of the plate removed, and the platform set up the necessary support to ensure the removal of the pipeline to plummet. 12mm steel plate with the original production of oxygen to contact the valve Blind, Blind flange diameter slightly larger than the diameter, blind flange screw holes under the board size drill and tapping. Meanwhile, in order to prevent the gas pipeline once the oxygen caused the accident can not be fully ruled out in advance to prepare 2 sets of fans at the scene to ensure the timely enforcement of the site for the wind. Early release 6000m3 / h air separation plant oxygen compressor carries oxygen to 4 sets of valves inside the flange, and to get oxygen valve and leave the appropriate gap between the flanges for pipe network to provide blowing point. Construction, in accordance with relief 2 hours, replacement 1 hour, 6 hours pipe removal, installation of new valves and pipe 6 hours, purge 1 hour, 1 hour leak pressure and the restoration of aspiration (extraction of blind plate and aspirated) 1 hours of procedure construction organization, a total of 18 hours. Relief, replacement has been completed, construction workers in the three-way valve from the pipeline network 6m Department of oxygen compressor export pipeline and 6000m3 / h air separation plant oxygen delivery pipe 6m Department of pipe cutting oblique mouth. Incision in the above two baffle, to prevent contact of oxygen valve flange apart and spilled into the pipeline. Demolition of the original oxygen to contact the valve 6000m3 / h air separation plant side of the flange screws, disengage flange, the blind flange on the valve plate fastened to ensure the Blind does not fall off. Will remove the pipe vertical fall, in order to contact the valve flange to prevent leakage of oxygen into the pipes apart and retain the pipe mouth oblique incision two baffle set, remove the original blind oxygen to contact the valve plate. Short and to the steel flange and add oxygen to contact the valve (the valve is fully open state) and the original oxygen to contact the valve flange connections. OK, after fastening flange, slowly add oxygen to contact the valve closed, and add oxygen to contact the valve of 6000m3 / h air separation plant additional blind side panels. After construction, polished the original pipeline welding, and welding oxygen compressor export pipelines Φ273mm × 8mm, 45 ° elbow and carries oxygen to pipelines Φ273mm × 8mm, 45 ° Y-shaped three-way valve. After welding, maintenance personnel with the cable car, will add oxygen to contact the valve outlet flange (Fa Lanti ago and export pipeline welding) and the valve connected. After connecting, the other end of the export pipeline and the 45 ° Y-shaped three-way valve welding, while the export pipelines and the oxygen compressor 45 ° Y-shaped three-way valve welding. 3 Implementation Effect After the construction, operation to restore aspirated to remove additional oxygen to contact the valve Blind, blind board oxygen tank, oxygen delivery to restore the oxygen compressor valve, open the new oxygen to contact the valve, the residual nitrogen with oxygen pipes were replaced. After 10 minutes, the pipeline carried gas component elution Department laboratory, after passing the normal delivery of oxygen. The roots of oxygen crack pipe relief valve installed to contact the valve handle and the successful transformation. 4 Conclusion The security risk exclusion, one month before construction began on the set personnel, materials, equipment and technical programs to prepare. As the preparations for the full, on-site the various situations that may arise in advance targeted prevention, the actual construction schedule completely controllable, and construction time than planned to complete slightly ahead.