2 Basic Requirements
2.1 General Requirements
2.1.1 The construction organization shall have corresponding construction qualifications.
2.1.2 Such construction technical documents as the construction organization design or technical scheme shall include green construction contents such as"Four Saving and One Environmental Protection"and shall be implemented after examination and approval according to relevant provisions.
2.1.3 The green construction of processing preparation shall meet the following requirements:
1 The plan of the site layout shall be able to optimize the process flow and shorten the haul distance,and should be within the coverage area of large hoisting machinery.
2 The new technology,new process,new equipment and new material shall be adopted and the high-pollution process technology shall not be adopted.
3 The construction site should adopt annular passages,combining permanent and temporary ones to reduce the occupied area.
4 The construction equipment and tools that are energy saving and environmental friendly shall be adopted and the utilization rate shall be improved.
5 The material shall be carried to the construction site according to processing flow and planned sequence,and the following principles shall be complied with:quoted material fetching,rational blanking and waste minimizing.
6 The temporary power line shall be arranged reasonably and shall be adopted with energy saving lighting.
7 The water saving pipe fittings should be adopted for suppressing the fugitive dust and the water for test should be recycled.
8 The periodical maintenance shall be carried out for the tools used for circulating materials to increase the recycling rate.
9 The noise control at the site shall be implemented according to"Noise Limits for Construction Site"(GB 12523).
10 The arc welding light pollution shall be reduced in the processing preparation.
11 The material and technology that are officially prohibited by the Nation shall not be used.
12 The wastes generated during the processing preparation process shall be disposed legally.
13 When the construction is finished,the materials shall be used out,the site shall be cleaned and the vegetation shall be restored.
2.1.4 Before construction,the joint examination on drawings and technical intent handover shall be carried out;the design modification shall be subjected to the approval procedure.
2.1.5 As for special type of work,the worker shall obtain corresponding qualification certificates after training.The welder shall work within the scope of his or her qualified items through examination;the nondestructive testing personnel shall work within the scope of the inspection method and grade specified in their certificates.
2.1.6 The measuring instrument shall be qualified through calibration and shall be within the validity period,the accuracy and measuring range shall meet construction requirements.
2.1.7 The special equipment shall meet relevant requirements of the Nation;its performance shall meet the construction technical requirements of processing preparation.
2.1.8 Effective measures shall be taken for materials and parts to prevent deformation,damage and rust during transportation and storage.
2.1.9 Steels shall not adopt cold machining when the working ambient temperature is less than the following temperatures:
1 Common straight carbon steel:-16℃.
2 Low alloy steel:-12℃.
2.1.10 The processing for machinery parts shall meet the design requirements.If there is no requirement for design,then the following requirements shall be met:
1 The tolerances for linear,angular and drilling hole diameter dimensions without individual tolerance indications shall meet accuracy requirements of level m stated in"General tolerances-Tolerances for Linear and Angular Dimensions without Individual Tolerance Indications"(GB/T 1804).
2 The screw thread tolerance without indication shall meet accuracy requirements of Level 6 stated in"General Purpose Metric Screw Threads-Tolerances"(GB/T 197).
3 The screw thread surface roughness shall not be larger than Ra25μm.
4 The run-outs for the screw thread shall meet the requirements of"Run-outs,Undercuts and Chamfers for General Purpose Metric Screw Threads"(GB/T 3).
2.1.11 The forging processing shall meet the design requirements.When there is no requirement for design,the dimension tolerance,form and position tolerance as well as machining allowance shall meet the requirements of"Tolerances and Machining Allowances of Steel Die Forging"(GB/T 12362.1)and"Machining Allowances and Tolerances for Steel Open Die Forgings on Hammer"(GB/T 15826).