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requirement of this clause.

8.1.4 This clause specifies the basic requirements for using gas for pressure test taking the place of liquid; in addition, the chief technical in-charge of the construction unit refers to the chief technical in-charge of a construction unit having qualification of business entity.

项   目

         2．主要相关标准

  Calculation formula for the value

 of the stress of the pipe wall [Formula 1]:

  管子与机器的法兰连接处，单机试车前，应在联轴器上架表检查确认最终连接情况，若有不合格，应进行调整，合格后方能进行试车。

                   2S

  管子材料的许用应力可按GB 50316《工业金属管道设计规范》中的数据选用。

  S－管子的公称壁厚，mm；S-nominal wall thickness of pipe, mm

Requirement for welding process

                  PtD0－S

压力

介

工业金属管道工程施工及验收

6.2.9~6.2.11 这三条是管道与机器连接时的要求。表6保留原规范SHJ 501－85表3.2.12的所有规定，GB 50235的规定见下表：

  －管子的焊缝系数。 -weld joint factor of pipe

7.5.5 管道焊接接头的质量合格等级是根据该焊接接头的载荷性质、服役环境、接头失效后的影响、选用材质、制造条件等因素确定的。

8.1.8 管道系统试压时，选择环境温度和控制介质温度是一个十分重要的环节。环境温度、金属温度、试验介质的温度，无不得低于规范所规定的最低温度。如果是合金钢管道系统，液体温度应高于金属材料的脆性转变温度。气体压力试验时也是这样，所以8.1.12条也作了相同的规定。这一规定，是依据《蒸汽锅炉安全技术监察规程》劳部发[1996]276号第208条的相应规定而编写的。

7.3.7 本条规定奥氏体不锈钢管道采用氩弧进行焊接接头的根部焊道焊接时，管内应充氩气或充氮气保护。充氩气保护是目前焊接规范的一贯要求。充氮气保护，是本规范所采用的新技术，已于1997年7月在兰州通过了集团公司组织的专家技术鉴定。主要技术参数为：氮气纯度应大于99.5%，含水量小于50 mg/L，管内氮气的浓度应大于99.9%，一般充气流量不宜过大，保证气体有流动状态为佳。

8.3.2 试验时，施工单位往往难以解决升压设备或气源，所以泄漏性试验可结合装置试车同时进行。

8.1.8      During the process of pressure test for piping system, it is a crucial link to choose the ambient temperature and control the medium temperature. Any ambient temperature, metal temperature or medium temperature shall not be lower than the lowest temperature specified by this Specification. For alloy steel piping system, the liquid temperature shall be higher than the brittle transition temperature of the metal material. This is also applicable to gas pressure test, so the same provision can be seen in Clause 8.1.12. This provision is formulated making reference to Clause 208 of Steam Boiler Safety Technology Supervision Order issued by Ministry of Labour in 1996, No. 276.

7.1 一般规定

7.5.5 The qualified grade of quality for the welding joint of piping is determined in consideration of various factors in respect of the welding joint, such as type of load, condition of service, influence of joint’s failure, material quality, condition for fabrication, etc..

7.4.12    This clause is formulated making reference to Clause 78 of Steam Boiler Safety Technology Supervision Order issued by Ministry of Labour in 1996, No. 276.

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