焊接连接阀门

管子的壁厚契合计划文件的需求，因而本次修订添加了“且不得小于计划文件规则的最小壁厚”。 6.1.8 Defect may occur during the pipe bending, therefore, in order to ensure the wall thickness after grinding the defect can reach the design thickness, this revision has supplemented that “and shall not less be than the minimal wall thickness given in the design document”. 6.1.10　本条规则了夹套管预制进程中施工单位应履行的要害技能需求，若计划有更具体的规则，应履行计划文件的规则。 6.1.10 This clause specifies the critical technical requirements to be followed by the construction unit during the prefabrication of ja

cket pipe. If more detailed requirement is provided in the design document, this design document shall be complied with. 6.1.11　管道内部清洁，是施工质量好坏的重要标志，是投料试车一次成功的要害条件之一，本规范6.2.1条也有管道内部清洁的需求。多年来，因为管道内部不洁净，严重影响试车进程，影响商品质量，有着深入的经验。所以预制合格的管道，一定要确保内部清洁，并及时关闭其端口。 6.1.11 The internal cleanness of the piping is the essential aspect affecting the construction quality, the critical requisition for the successful commissioning and service at the first time. Clause 6.2.1 of this specification also specifies the internal cleanness of piping. Deepgoing lesson have been learned from the serous impact to commissioning and production quality due to uncleanness inside piping in the past years. Thus the inside of qualified prefabricated pipes shall be kept clean and the end openings shall be timely closed. 6.2　管道设备 Piping Installation 6.2.9~6.2.11　这三条是管道与机器衔接时的需求。表6保存原规范SHJ 501－85表3.2.12的一切规则，GB 50235的规则见下表： 6.2.9~6.2.11 These three clauses are in regard to the requirements on the connection of piping to machines. In Table 6, all the specification of 3.2.12 of Table SHJ 501-85 in the original specification has been maintained and the following table lists the specification of GB 50235: 法兰平行度、同轴度答应偏差 Tolerance of flange parallelism depth and axiality 机器转速 Machine rotation speed r/min 平行度 Parallelism depth mm 同轴度 Axiality mm 3000~6000 ≤0.15 ≤0.50 >6000 ≤0.10 ≤0.20 　　相互对比，本规范保存了转速<3000 r/min时的需求，因为转速小于3000 r/min的滚动机器在石化职业里对比遍及。 Through the intercomparison, the requirement under the condition of rotation speed of <3000r/min has been maintained in this specification as the rotating machine with the rotation speed less than 300r/min is commonly used in petrochemical industry. 　　管子与机器的法兰衔接处，单机试车前，应在联轴器上架表查看承认终究衔接情况，若有不合格，应进行调整，合格后方能进行试车。 The final connection status shall be checked for the flange c

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