Riser Systems

The riser system is a vertical pipeline assembly that connects the submarine pipeline with the surface platform/floating facility. It builds a fluid transportation channel between the seabed and the surface, and is divided into two categories: rigid risers and flexible risers. It integrates components such as the pipeline body, connection nodes, tensioning devices, and support structures, and is an indispensable key equipment for floating platforms and fixed platforms. 

Application scenario

1. FPSO and FSO floating production, storage and offloading vessels are suitable for deepwater and ultra-deepwater oil and gas transportation. The mainstream structures used are steel suspension lines and flexible risers.

2. Fixed jacket platforms and offshore drilling platforms are mostly used for rigid production risers and drilling riser pipes in shallow to medium-deepwater conditions.

3. Offshore wind power conversion stations and integrated operation platforms are used for transporting process media and power-coupled fluids.

4. Marine projects in polar and low-temperature sea areas select special low-temperature-resistant pipe materials.

5. Vertical transportation channels for underwater booster systems and chemical agent injection systems. 

Main structure

Rigid riser: Mainly composed of large-diameter steel pipes, equipped with top sliding joints, bottom universal joints, guiding supports, fatigue reinforcement nodes, and some top tension risers are also equipped with top tensioners to maintain structural stability;

Flexible riser: Adopting a multi-layer composite structure, consisting of a frame, inner and outer protective sleeves, pressure armor layer, tension armor layer, etc., it has the characteristics of resisting bending and fatigue, and is suitable for floating body swaying conditions;

The entire system includes riser bases, anti-vortex-induced vibration devices, anti-corrosion protection structures, maintenance platforms, auxiliary pipeline supports, etc. The key connection nodes are the core of quality control. 

Corresponding product standards

1. Design standards: ISO 19904-1 "Design and Evaluation of Floating Offshore Structures", DNV-ST-0119 "Design Standards for Offshore Wind Turbine Structures"

2. Pipe material standards: API Spec 5L, ISO 3183, EN 10217 (Pressure-bearing Pipeline Standards)

3. Special standards: ISO 13628 "Design Specifications for Subsea Production Systems", NACE SP0108 "Corrosion Control Standards for Offshore Structures"

4. Welding standards: AWS D1.1, ISO 17660 "Quality Requirements for Steel Structure Welding"