4　材料、管道附件、撬装设备的检验与储存

• 4.1　一般规定

• 4.2　材料、管道附件、撬装设备的检验

• 4.3　材料、管道附件、撬装设备的储存

5　下料与加工

• 5.1　钢管下料

• 5.2　管件加工

• 5.3　管道单元预制

6　管道安装

• 6.1　一般规定

• 6.2　管道安装

• 6.3　阀门安装

• 6.4　管道附件制作、安装

7　焊接

• 7.1　一般规定

• 7.2　焊接材料

• 7.3　焊接

• 7.4　焊缝检验与验收

8　管沟开挖、下沟与回填

• 8.1　管沟开挖

• 8.2　管道下沟

• 8.3　管沟回填

9　吹扫与试压

• 9.1　一般规定

• 9.2　吹扫与清洗

• 9.3　强度及严密性试验

• 9.4　干燥

10　防腐和保温

• 10.1　一般规定

• 10.2　防腐

• 10.3　保温

附录A　管道对接接头坡口型式

• A.1　不等壁厚管道对接坡口型式

• A.2　等壁厚管道对接坡口型式

4 Inspection and storage on materials，pipe fittings and skid-mounted equipment

• 4.1 General requirement

• 4.2 Inspection on materials，pipe fittings and skid-mounted equipment

• 4.3 Storage of materials，pipe fittings and skid-mounted equipment

5 Cutting and processing

• 5.1 Steel pipe cutting

• 5.2 Processing on pipe fittings

• 5.3 Prefabrication of pipeline units

6 Installation of pipelines

• 6.1 General requirement

• 6.2 Installation of pipes

• 6.3 Installation of valves

• 6.4 Fabrication and installation of pipe fittings

7 Welding

• 7.1 General requirement

• 7.2 Welding materials

• 7.3 Welding

• 7.4 Inspection and acceptance of weld joint

8 Ditching，lowering-in and backfilling

• 8.1 Ditching

• 8.2lowering-in

• 8.3 Backfilling

9 Blowing and pressure test

• 9.1 General requirement

• 9.2 Blowing and washing

• 9.3 Test on strength and leakage

• 9.4 Drying

10 Corrosion resistance and thermal insulation

• 10.1 General requirement

• 10.2 Corrosion resistance

• 10.3 Thermal insulation

Appendix A Preparation shape of butt-joint between pipes