Overview
EN ISO 13628-3:2000 - "Petroleum and natural gas industries - Design and operation of subsea production systems - Part 3: Through flowline (TFL) systems" provides requirements and recommendations for the design, manufacture and implementation of through flowline (TFL) injection systems used in offshore and subsea wells. The standard covers hydraulic downhole equipment, subsea trees, tubing hangers, production suspensions, service lines and associated surface and subsea equipment for TFL applications. It applies primarily to subsea injection systems but is also applicable to highly deviated or horizontal wells. Not included are seabed separation, overpressure protection, metering/counting and downhole pumps.
Keywords: EN ISO 13628-3:2000, through flowline (TFL) systems, subsea production systems, TFL injection systems.
Key Topics
- System description and components: definition of TFL systems, subsea tree, tubing hanger, diverters and selectors.
- Surface equipment: requirements for pumps, control manifold, control console, lubricator, fluid storage and separators.
- Piping design and fabrication: design criteria, material selection, welding/fabrication practices, hydrostatic and drift testing.
- Pressure rating and testing: guidance on pressure classes, testing procedures and inspection for both surface and subsea components.
- Completion equipment and tools: tubing, packers, circulation members, standing valves and TFL tool design.
- Operations and safety: personnel training, service planning, fluid selection, pumping operations and procedures for returning wells to production.
- Annexes: technical delivery conditions for TFL pipe, example operating pressure calculations, completion types and TFL capabilities.
Keywords: subsea tree, tubing hanger, TFL piping, surface control, testing and inspection.
Applications
EN ISO 13628-3:2000 is used by:
- Subsea and completion engineers designing TFL injection systems for offshore oil & gas fields.
- Equipment manufacturers and fabricators producing subsea trees, tubing hangers, service lines and TFL-specific components.
- Operators planning TFL pumping, well interventions and surface/subsea integration.
- Project managers, procurement and QA teams for specification, testing and acceptance of TFL systems.
- Regulators and standards committees referencing best-practice for safe and reliable subsea injection operations.
Typical applications include seawater or chemical injection via TFL, well stimulation operations, and circulation/control for highly deviated or horizontal wells.
Related Standards
- EN ISO 13628 series (other parts such as ISO 13628-4:1999 on subsea wellhead and tree equipment are cross-referenced).
- Referencing the ISO 13628 family helps ensure consistency across subsea tree, completion and control system design.
Using EN ISO 13628-3:2000 helps teams reduce operational risk, ensure compatibility between surface and subsea equipment, and standardize design, testing and operational practices for through flowline injection systems.
