Flexible risers or flexible pipes have proved to be a perfect solution for shallow and deep water flow line and riser systems around the globe. In these kinds of applications the flexible pipe section is used along with the total riser length or even limited to short sections that are dynamic, like the jumper. These flexible risers are able to accommodate a number of situations. The flexible risers are able to withstand vertical and horizontal movement and this is what makes them perfect for the floating facilities to use. In earlier times, the floating pipe was being used for connecting production equipment aboard a facility of the floating kind to export and production risers, but in recent times it works as a primary riser solution. You will find various numbers of configurations for flexible risers and it includes, lazy S and the steep S that use the buoyancy modules that are anchored, and the lazy wave and the steep wave are able to incorporate buoyancy modules.
A structure that works fit-for-purpose
The flexible pipe is made up of many different layers, the main components being barriers that are leak proof and thermostatic and steel wires that are resistant to corrosion. The helically wound steel wires are able to provide resistance to high-pressure and the characteristics required for excellent bending to the structure, providing the flexibility along with a behavior that is dynamic. You will find that the layers in modular construction are independent but designed in a manner by which they interact with each other and so every layer is made fit-for-purpose, and is adjusted independently to meet the requirement of a specific field development.
Taking the Main Characteristics into consideration
- Flexibility : This can be considered as the prime characteristic of a flexible riser, or pipe. For example, an 8” ID (internal diameter) flexible pipe could be bent to a 2m radius or even less. This is one reason for the flexible dynamic risers to be the enabling technology for systems of floating production. This flexibility works well even for flow lines that are laid on seabed uneven conditions. This flexibility can spool the pipe on carousal or a reel for quick and efficient installation after the transportation.
- Installation : As these flexible pipes come in a continuous length the average laying speed is 500m per hour. During installation, the sections are separately connected on deck which eliminates the requirement of any subsea connections or intermediate riser base structure. This elimination can reduce the risks in operations.
- Modularity : The flexible structures could be tailored to precise needs of any specific development due to independent layers. Flexible pipes can have around four layers and the most complex ones may have around 19 layers. Beyond the stress-resistant wires and the basic fluid barriers you can also include additional layers that can prevent wear and tear between steel layers, or even to provide thermal insulation which is improved. Besides this you are able to assemble electrical cables, plastic hoses or even optical fibers around the flexible pipe which can produce ISU (Integrated Service Umbilical).
Find the Right Engineering Contractor
You need to look out for global engineering contractor that specialize in structural analysis, design and the integrity management of conductor and riser systems which are used in the process of drilling and the production of offshore gas and oil reserves. You need to make sure of the experience factor and not forget to look out for their reputation. A company that has a thorough knowledge of the challenges of harsh environmental conditions, greater water depths, the high pressures and temperatures, and platform arrangements which are new can be best flexible riser and the installation.