SUBSEA SYSTEMS Design of subsea structures

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Contents
1. Scope ....................................................................................................................... 3
2. Reference documents............................................................................................. 3
3. Introduction ............................................................................................................. 6
3.1 Responsibility.................................................................................................................. 6
3.2 Abbreviations .................................................................................................................. 6
4. General requirements ............................................................................................. 7
4.1 Functional requirements.................................................................................................. 7
4.2 Intervention requirements ............................................................................................... 7
4.3 Corrosion Protection Requirements ................................................................................ 9
4.4 Abandonment requirement.............................................................................................. 9
5. Structure requirements......................................................................................... 10
5.1 Introduction ................................................................................................................... 10
5.2 Design requirements ..................................................................................................... 11
5.3 Concept 1: Multiwell Template with Manifold requirements ........................................... 12
5.4 Requirements for Concepts 2A and 2B Individual Wells connected to a Subsea
Manifold Centre in cluster or satellite configuration ....................................................... 13
5.5 Concept 3: two slot structure......................................................................................... 14
5.6 Concept 4: Individual wells............................................................................................ 14
5.7 Jumper requirements .................................................................................................... 14
6. Piping system requirements ................................................................................ 14
6.1 Functional requirements for manifold piping system...................................................... 14
6.2 Manifold barrier requirements ....................................................................................... 15
6.3 Piping design requirements........................................................................................... 15
6.4 Preservation requirements for piping system ................................................................ 17
6.5 Additional requirements for piggable lines..................................................................... 17
6.6 Valves ........................................................................................................................... 18
7. Installation requirements...................................................................................... 18
7.1 Transportation requirements ......................................................................................... 18
7.2 Lifting requirements ...................................................................................................... 18
8. Interfaces ............................................................................................................... 20
The purpose of this specification is to provide specific requirements for Subsea Structures.
This specification covers the following development concepts:
• Concept 1: Multi-well Template with Production Manifold:
- Concept 1A Integrated template/manifold
- Concept 1B Modular template/manifold
• Concept 2: Individual Wells Connected to a Subsea Manifold Centre
- Concept 2A Cluster configuration
- Concept 2B Satellite configuration
• Concept 3: Two slots structure
• Concept 4: Individual wells in daisy chain configuration (Production or injection).
The specification covers both permanently installed structures, equipment and associated tools,
temporary equipment required for offshore installation and commissioning of the systems as
well as potential intervention work.
The document is valid for all phases of a field development such as engineering, procurement,
construction, testing, installation, commissioning and operation.
Specific requirements to valves in the manifold systems or other valves on Subsea Structures
are defined in separate specifications listed hereafter