5月23日 焊前预热与焊后热处理方案 Rev.03.doc

焊前预热与焊后热处理方案 Preheating and Post Welding Heat Treatment Procedure MDI-TCC-92L012-MS-039 3 25.May.2013 Revised asTMDI comments 2 18.Apr.2013 Revised asTMDI comments GAO BIN XIA KAO FEI ZHAO QI 1 8,Mar,2013 Revised asTMDI comments GAO BIN XIA KAO FEI ZHAO QI 0 14,Jan,2013 Issue for approval GAO BIN XIA KAO FEI ZHAO QI Revision Date Revision Description Prepared By Reviewed By Approved By 目录 Contents 1. 概述General 2. 编制依据 References 3. 焊前预热与焊后热处理执行程序和计划 PWHT Execution Plan and Procedure 4. 硬度检查和无损检测 Hardness Test and RT 5. 标识管理 Marks Management 6. 附件 Attachments 1.概述General 为了降低和消除管道焊接应力，防止出现应力腐蚀裂纹。应用电加热的方法对焊缝进行热处理，热处理适用于碳钢(t 19mm)、和输送介质代码为701、702管道的管子、管件。我公司施工范围内的需要热处理的有A672-C60、A106-B两种材质。 The procedure is prepared to reduce or eliminate the welding stress of pipe and avoid stress corrosion cracking. Do the heat treatment for the welding seams by using the electrical heating method. The heat treatment is suitable for the carbon steel (t 19mm), pipe and fitting which code for conveying medium is 701 and 701. There are two materials (A672-C60 and A106-B) need to do the heat treatment within the construction scope which is conducted by TCC. 2.编制依据 References 2.1．GB/T20801-2006 压力管道规范-工业管道 Pressure piping code—Industrial piping. 2.2．GEN-0-PIPE-SP-0052 预制/现场管道的焊接与无损检测规范 Code for prefabrication/ site pipe welding and non destructive examination. 2.3．GEN-0-TECH-SP-0008 焊接制作的基本要求 General requirements for welding fabrication 2.4 ASME B31.3-2010 工艺管道 process pipe 2.5 热处理和无损检测地上管道汇总表(REV NO.1A) The summary sheet of heat treatment non destructive examination for A/G pipe (REV NO.1A) 3.0 焊前预热与焊后热处理执行程序和计划 PWHT Execution Plan and Procedure 3.1焊前预热 Preheating 3.1.1需要预热的碳钢焊口外径≥219mm或壁厚≥ 20mm的管子采用电加热，电加热时用控温箱记录预热的温度并做好预热的温度曲线。 The external diameter of carbon steel welded junction which are need do the heat treatment ≥219mm or the pipe which thickness of shell ≥ 20mm need use heat treatment. Record the preheating temperature by using temperature c