Riser hang-off collar is the lifeline for transporting oil, gas, and drilling fluid, and the core function of this collar is to firmly secure the riser, ensuring safe and smooth operation of oil production, drilling, and other tasks.
Secure Suspension to Prevent Dislodgment
It tightly clamps onto the subsea oil pipeline, transferring the weight of the pipeline, the oil and gas inside, and the tools to the offshore platform. Even when hit by ocean currents or large waves, the pipeline will not shift or fall off.
Safety Guarantee in Emergency Situations
In case of typhoons, equipment failures, or other emergencies that require disconnecting the oil pipeline from the subsea wellhead, the collar can firmly fix the disconnected pipeline on the platform, preventing it from being tossed around and damaged by wind and waves.
Convenient Maintenance to Save Time
When the oil pipeline needs inspection or part replacement, the collar helps safely lift or fix the pipeline. This eliminates the need for time-consuming disassembly work and significantly reduces downtime losses.
Adaptable to Different Oil Production Scenarios
Different offshore oil production scenarios have different requirements for this "hook", but the collar can adapt to all of them without the need for repeated model changes:
Specialized Model for Floating Production Storage and Offloading (FPSO) Vessels
For FPSOs—vessels that float on the sea for oil production and storage—the oil pipelines are usually connected to the vessel's turret at an inclined angle. In this case, a "split-type" collar is used, which is like an openable clamp. It can be installed in the dry area of the platform, preventing the pipeline from colliding with other parts and ensuring stable suspension of the inclined pipeline.
Matching Model for Catenary Risers
Some oil pipelines hang between the seabed and the platform like a chain (called catenary risers). The collar is installed under the key joints of the pipeline and can work with underwater robots. If a joint is damaged, the robot can help lift it to the surface for repair—no need for divers to work in deep sea, making the process safer and more convenient.
Adaptive Model for Vertical Risers
Some oil pipelines hang almost vertically between the platform and the seabed. The collar works in conjunction with tensioners and expansion joints on the platform. When the platform heaves up and down due to waves, the expansion joints stretch or contract accordingly, while the collar firmly stabilizes the pipeline to prevent it from being pulled apart by the movement.
Product Structure and Advantages
Split-Type Design: This is the most commonly used model. It is like an openable clamp that can be directly fastened to the pipeline for fixation. There is no need to disassemble the entire oil pipeline, and installation or replacement can be completed in just a few hours on the offshore site.
Operable in Deep Sea: For deep-sea oil production, the collar is equipped with interfaces for underwater robot operation. The robot can handle installation and disassembly, eliminating the need for divers to take risks in deep sea.
Space-Saving: It has a compact design and does not protrude excessively. This ensures that other nearby parts and equipment can be installed and operated normally without mutual interference.
