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API 5LD是针对长距离输送管线系统的一个标准，API是美国石油协会的简称，而5LD指的是第五版的线路管道规范，这个标准为油气行业的管线系统设计、建造、运营和维护提供了指导和要求。
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（图片来源网络，侵删）
由于API 5LD是一个专业性很强的文档，并且通常是以英文发布的，因此没有提供“api 5ld 英文版_语言版本”的具体信息，不过，我可以为你概述API 5LD的内容结构：
API 5LD Pipeline System Line Pipe Standard
1. General Provisions
Scope
Field Documentation and Records
Responsibility of the Owner
Training
Quality Assurance
2. Design Considerations
Design Basis
Loads
Stress Analysis
Strain Based Limits
Deflection Control
Supports and Expansion Joints
3. Materials
Steel Pipe
Welding Consumables
Coatings and Linings
4. Fabrication, Inspection, and Testing
Fabrication
Examination
Testing
Nondestructive Examination Personnel Qualification
5. Pipeline Installation
Trenches
Bends
Lowering Pipe into the Trench
Backfill and Burial
River Crossings
Laying on or in Mudline
Hydrostatic Testing
6. Commissioning and Decommissioning
Commissioning
Decommissioning
7. Operation and Maintenance
Operating Conditions
Maintenance
Patching
Inservice Inspection
Cathodic Protection
8. Appendices
A. Glossary of Terms Used in This Standard
B. Recommended Practices for FitnessforService of API 5L Pipe
C. Paragraphs Revised or Added Since Previous Publication
D. Metric/English Units Conversion Tables
9. Indexes
Identification Index
Subject Index
请注意，上述内容是根据API 5LD的结构大致概括的，并不完整，如果你需要更详细的信息或具体的章节内容，请直接查阅最新版的API 5LD标准文档，通常这些文档需要购买才能获得，你可以从美国石油协会（API）或其授权代表处获取。 |
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