ISO 13628-7:2005

Overview

ISO 13628-7:2005 - "Petroleum and natural gas industries - Design and operation of subsea production systems - Part 7: Completion/workover riser systems" provides requirements and recommendations for the design, analysis, materials, fabrication, testing and operation of subsea completion/workover (C/WO) riser systems deployed from a floating vessel. Intended as a common reference for designers, manufacturers and operators, it applies to new C/WO riser systems and can be used for modifications, reuse at different locations and operation of existing systems.
Note: the standard is limited to risers manufactured from low-alloy carbon steels; titanium, composites and flexible pipes are out of scope.

Key Topics

• System requirements & engineering: system definition, modes of operation, safety and barrier principles, organizational and personnel qualifications.
• Functional and design requirements: drift and component requirements, workover control systems, connector and pipe design criteria, loads and fatigue considerations.
• Components covered: riser joints and connectors, workover control systems, surface flow trees, surface tree tension frames, lower workover riser packages, lubricator/retainer valves, subsea test trees, swivels, annulus hoses, riser spiders, umbilical clamps, handling/test tools and tree cap running tools.
• Materials, fabrication & testing: material selection, manufacturing, NDT, pressure and qualification testing, hydraulic cleanliness and FAT (factory acceptance testing).
• Inspection, maintenance & monitoring: in-service inspection, reassessment, monitoring and lifecycle maintenance planning.
• Documentation & traceability: design basis, analysis, connector documentation, as-built records, installation & operation manuals, condition résumés.
• Annexes: practical guidance including fatigue analysis, structural resistance methods, connector qualification, purchasing guidance, bolt preload and seals.

Applications

ISO 13628-7:2005 is used to:

• Guide subsea riser system design for completion/workover operations from floating vessels.
• Define acceptance criteria for manufacturers and fabricators (materials, testing, FAT).
• Support operators in procedures for installation, operation, inspection and reassessment of C/WO risers.
• Serve procurement and project teams when specifying equipment interfaces, connector qualification and documentation deliverables.
• Reduce reliance on multiple company specs by providing a common engineering reference.

Who should use this standard

• Subsea and mechanical engineers (riser, connector, fatigue specialists)
• Equipment manufacturers and fabricators
• Offshore operations and maintenance teams
• Project managers, procurement and quality assurance personnel
• Regulatory and certification bodies reviewing riser safety and compliance

Related Standards

• Other parts of ISO 13628 (Part 1 general requirements, Part 4 subsea wellhead and tree equipment, Part 5 subsea umbilicals, Part 6 production control systems) provide complementary guidance for integrated subsea production systems.