BS EN 10208-2:2009 Steel pipes for pipelines for combustible fluids. Technical delivery conditions. Pipes of requirement class B
BS EN 10208-2 is the European standard that specifies the technical delivery conditions for seamless and welded steel pipes for the on land transport of combustible fluids primarily in gas supply systems but excluding pipeline applications in the petroleum and natural gas industries. It includes more stringent quality and testing requirements than those in BS EN 10208-1.
Steel pipes for pipeline transportation systems within the petroleum and natural gas industries are covered by ISO 3183. BS EN 10208-2 specifies products with the same (and additional) strength levels and partly similar (but not identical) requirements as EN 10208-1 and EN 10208-2 and is with two additional annexes specifying deviating or additional requirements also published as API Spec 5L.
BS EN 10208-2 does not apply to cast steel pipe.
It was the intention, when preparing this document, to avoid specifying the quality of line pipe to be used for a particular application. However, it was recognized that there are several quality levels commonly used, and it was decided to reflect these in the standard by the differentiation between two quality levels.
Firstly, the need was recognized to provide a basic quality level. This is designated requirement class A and considered in BS EN 10208-1.
Secondly, many purchasers impose requirements additional to the basic standard, for instance concerning toughness and non-destructive inspection. This approach is common, for example, for transmission pipelines.
Such enhanced requirements are addressed in requirement class B and considered in BS EN 10208-2.
For offshore applications and other applications outside the scope of BS EN 10208-1 and BS EN 10208-2, other standards may be applicable, e.g. ISO 3183.
The Charpy impact energy requirements in this document have been derived from established data, in accordance with EPRG recommendations, and are intended to prevent the occurrence of long running shear fracture in pipelines transporting clean, dry natural gas. It is the responsibility of the designer to decide whether these energy requirements suffice for the intended application. For example, rich gas or two-phase fluids may require additional testing to be carried out.
For pipes of requirement class B, a weld efficiency factor of 1,0 can be used in design calculations, due to the conditions specified for the manufacture of the pipes and for the testing of the tubes.
The selection of the requirement class depends on many factors: the properties of the fluid to be conveyed, the service conditions, design code and any statutory requirements should all be taken into consideration. BS EN 10208-2 gives no detailed guidelines. It is the ultimate responsibility of the user to select the appropriate requirement class for the intended application.
This document combines a wide range of product types, dimensions and technical restrictions in accordance with the functional requirements for gas supply systems referred to in BS EN 1594 Gas supply systems. Pipelines for maximum operating pressure over 16 bar. Functional requirements.
Contents of BS EN 10208-2 include:
- Introduction
- Scope
- Normative references
- Terms and definitions
- Symbols and abbreviations
- Classification and designation
- Information to be supplied by the purchaser
- Mandatory information
- Options
- Example of ordering
- Manufacturing
- Steelmaking
- Pipe manufacture
- Heat treatment condition
- Sizing
- Strip end welds
- Jointers
- General requirements for non-destructive testing
- Requirements
- Chemical composition
- Mechanical properties
- Weldability
- Appearance and soundness
- Dimensions, masses and tolerances
- Inspection
- Types of inspection and inspection documents
- Summary of inspection and testing
- Selection and preparation of samples and test pieces
- Test methods
- Retests, sorting and reprocessing
- Marking of the pipes
- General marking
- Special marking
- Coating for temporary protection
- Manufacturing procedure qualification
- Treatment of imperfections and defects disclosed by visual examination
- Non-destructive testing
- Bibliography
