4　测量放线及施工作业带清理

• 4.1　一般规定

• 4.2　测量放线

• 4.3　施工作业带清理

5　材料及管线附件验收

• 5.1　一般规定

• 5.2　防腐管装卸、运输

• 5.3　验收及保管

7　管　　沟

• 7.1　一般规定

• 7.2　管沟几何尺寸

• 7.3　管沟开挖

• 7.4　管沟验收

8　管线焊接与验收

• 8.1　一般规定

• 8.2　焊接环境

• 8.3　焊前准备

• 8.4　管口组对

• 8.5　预热温度和道间温度控制

• 8.6　对口器撤离

• 8.7　焊　　接

• 8.8　修补和返修焊接

• 8.9　连头焊接

• 8.10　焊口标识

• 8.11　管线焊缝的验收

9　管线下沟及管沟回填

• 9.1　管线下沟

• 9.2　管沟回填

10　管线防腐及补口、补伤

• 10.1　一般规定

• 10.2　管线防腐

• 10.3　管线防腐的补口、补伤

12　管线清管、测径和试压

• 12.1　一般规定

• 12.2　管线清管、测径

• 12.3　管线压力试验

13　管线附属工程

• 13.1　三桩埋设

• 13.2　水工保护

• 13.3　阴极保护

附录A　焊接工艺评定要求

• A.1　一般规定

• A.2　V形缺口夏比冲击韧性试验

• A.3　宏观金相和硬度检测

• A.4　复　　验

4　Surveying setting-out and clearance of construction working zone

• 4.1　General requirement

• 4.2　Surveying setting-out

• 4.3　Clearance of construction working zone

5　Acceptance of material and pipe auxiliaries

• 5.1　General requirement

• 5.2　Loading，unloading and transportation of anti-corrosion pipe

• 5.3　Acceptance and storage

7　Pipe trench

• 7.1　General requirement

• 7.2　Geametrical size of trench

• 7.3　Pipe trench digging

• 7.4　Acceptance of pipe trench

8　Welding of pipe and acceptance

• 8.1　General requirement

• 8.2　Welding environment

• 8.3　Preparation before welding

• 8.4　Alignment

• 8.6　Removal of lineup clamp

• 8.5　Preheat temperature and interpass temperature

• 8.7　Welding

• 8.8　Welding repairing during or after welding

• 8.9　Welding of connection joint

• 8.10　Markers and signs of welds

• 8.11　Acceptance of pipe welds

9　Lowering-in of pipeline and backfilling of pipe trench

• 9.1　Lowering-in of pipeline

• 9.2　Backfilling of pipe trench

10　Anticorrosion，repairing and joint coating of pipe

• 10.1　General requirement

• 10.2　Anticorrosion of pipe

• 10.3　Acceptance of pipe welds

12　Clearance of pipe，measure of diameter of pipe， pressure test of pipe

• 12.1　General requirement

• 12.2　Clearance of pipe，measure of diameter of pipe

• 12.3　Pressure test of pipe

13　Affiliated project

• 13.1　Setting up three piles

• 13.2　Hydraulic protection

• 13.3　Cathodic protection

Appendix A　Requirement of welding procedure specification