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办理办U-PVC管聚乙烯管生产许可证程序;快办郴州pe饮水管许可 |
inclined to produce crack during the process of fabrication. Cr-Mo steel has an obvious inclination of harden quenching, belonging to crack sensitive material; especially after heat treatment, the reheat crack sensitivity will appear; once the resistance to deformation is lower than the actual amount of deformation, crack will occur. Non- austenite low temperature steel has an inclination of harden quenching, whose groove easily produces surface tiny crack under heat processing; excessively sudden cooling after welding may cause crack and harden quenching. For the sake of safety, it is necessary to carry out
inspection on these types of welding joints. In addition, the welding operation of these types of welding joints shall be strictly in conformity with the relevant specification. 7.5.8 超声波检测是查验焊缝内部质量的有用办法,灵敏度高、对人体无害,但对查验人员技能和检测外表的需求高,但因为不像射线透照那样能够留下底片备检,所以其可追溯性差。因而用超声波检测替代射线检测时,检测前应征得计划单位同意。 7.5.8 Supersonic detection is deemed to be an efficient method for inspection of internal quality of the weld joint, which is highly sensitive and not harmful to human, but requires high level of technical skill and detected surface condition. Unlike the radial transillumination that can le*e negative film for future reference, supersonic detection is hardly traceable. Therefore, in *e supersonic detection is adopted to take the place of radial detection, an approved must be got from the design unit in advance. 8 管道体系实验 Test for piping system 8.1 管道体系压力实验 Pressure test for piping system 8.1.4 本条规则用气体替代液体作压力实验时应做到的基本需求,另外,这儿所指的施工单位技能总负责人是具有法人资格的施工单位的技能总负责人。 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 h*ing qualification of business entity. 气体压力实验有较大的危险性,在同一实验压力时,其储能要比液体压力实验时大几百倍乃至几千倍,所以要高度重视。一起,实验时有必要有安全部分在现场进行监督。 Gas pressure test is comparatively dangerous. Under the same test pressure as hydraulic pressure test, the stored energy of gas pressure test is several hundred times or even several thousand times of that of hydraulic pressure test, which needs high attention. Besides, security department shall be *ailable on site for supervision during the process of test. 8.1.6 管道体系的实验压力,应按计划文件规则履行。假如计划未作规则,则按本条规则的公式进行核算。一起也可用本核算公式来校验计划文件规则的实验压力。 8.1.6 The test ! 以上内容是行业相关标准的节选,内容与标题没有直接的相关性,只是为了利于搜索引擎的收录。具体项目办理细节及流程欢迎您来电咨询,我们致力于把我们所擅长的项目做到*。 公司地址:南京市鼓楼区中央路417号先锋广场1033室 联系人:田雨 (业务经理) 手机号码:13770751414 联系电话:025-66639814 QQ:453472919 传真:025-66639971 Cl