ISO 13628-15:2011

Overview

ISO 13628-15:2011 - "Petroleum and natural gas industries - Design and operation of subsea production systems - Part 15: Subsea structures and manifolds" provides recommended practices for the design, materials, fabrication, installation, operation and decommissioning of subsea structures and manifolds used in subsea production and injection systems. It covers structural components and piping systems such as production/injection manifolds, single‑satellite and multiwell templates, subsea processing and boosting stations, flowline/export riser bases (FRB/ERB), pipeline end manifolds (PLEM), pipeline end terminations (PLET), tees/Y‑connections and subsea isolation valves (SSIV). The standard is intended to be used alongside other recognized industry specifications and does not replace specific mandatory requirements from other documents.

Key technical topics and requirements

• Functional and system requirements - system interfaces, cluster manifold and template functional considerations.
• Design considerations - system design principles, loading scenarios, piping and structural design, foundation design and component selection.
• Materials and piping requirements - material selection, corrosion resistance (CRAs), welding qualifications, non‑destructive testing and mechanical/corrosion testing per referenced standards.
• Fabrication and manufacturing - traceability, overlay welding/buttering, external corrosion protection and colour coding.
• Verification and validation - design verification, validation activities and documentation expectations.
• Installation, operation & maintenance - installation procedures, operational considerations, maintenance planning and requirements during installation.
• ROV/ROT, lifting and handling - remotely operated vehicle/tool interfaces, lifting pad eyes and other lifting devices, marking, transportation and sea‑fastening.
• Abandonment & decommissioning - provisions for end‑of‑life design and post‑abandonment operation.
• Exclusions - the standard does not apply to pipeline/manifold valves, flowline/tie‑in connectors, choke valves and production control systems.

Practical applications

• Designing and specifying subsea manifolds and templates for oil & gas production and injection projects.
• Establishing material, welding and testing regimes for subsea piping systems.
• Guiding fabrication yards, subsea installers and inspection teams on acceptable practices for construction, marking, lifting and storage.
• Preparing decommissioning and abandonment strategies for subsea structures.

Who should use this standard

• Subsea engineers and system designers
• EPC contractors, fabricators and inspection/NDT teams
• Operators planning subsea developments and manifold installations
• Project managers, HSE and regulatory compliance teams

Related standards (select)

• ISO 13628-1, -4, -8 (other parts of the subsea production systems series)
• ISO 3183 (steel pipe), ISO 15156 (materials for H2S environments)
• ASME B31.3 (process piping), ISO welding and NDT standards

Using ISO 13628-15:2011 helps ensure consistent, industry‑aligned engineering, safer installation and reliable operation of subsea manifolds and associated structures.