Swivel flanges are key components in offshore and subsea pipeline operations

Swivel flanges are a specialized type of weld neck flange, designed with an outer ring that allows 360° rotation of the inner ring. This unique feature enables rapid alignment of bolt holes with the standard flange, making swivel flanges an ideal choice for offshore and subsea pipeline operations. This article delves into the design, applications, and benefits of swivel flanges, highlighting their critical role in various industrial sectors.

Design and Features of Swivel Flanges

Swivel flanges consist of two main parts: an outer ring and an inner ring. The inner ring is capable of rotating within the outer ring, allowing for precise and effortless alignment of bolt holes. This design is particularly advantageous in challenging environments, such as underwater installations, where quick and accurate alignment is essential.

Swivel flanges can be designed to accommodate a wide range of nominal sizes and pressure ratings, from Class 150 to Class 2500 and diameters from 1/2 inch to 60 inches. These specifications are in accordance with established standards such as ASME B16.5, API 6A, and MSS SP44. Additionally, some manufacturers offer non-standard swivel flanges tailored to specific applications, featuring customizations like cladding welding on the inner ring or PTFE coating treatments on the flange surface.

Applications of Swivel Flanges

Swivel flanges are predominantly used in offshore and subsea pipeline operations due to their ease of alignment and installation. They facilitate quicker and more convenient bolt hole adjustments, which is particularly beneficial for divers working under challenging conditions. The ability to swiftly align bolt holes significantly reduces the time and effort required for installation, enhancing overall operational efficiency.

These flanges are also suitable for high-pressure and large-diameter pipeline systems, ensuring reliable and secure connections. Industries such as oil and gas, chemical processing, and shipbuilding commonly employ swivel flanges in their pipeline systems to leverage their superior alignment capabilities and robust performance.

Benefits of Swivel Flanges

Enhanced Installation Efficiency: The 360° rotational feature of swivel flanges allows for rapid and precise alignment of bolt holes, drastically reducing installation time.

Cost Reduction: By minimizing alignment issues and the associated rework and delays, swivel flanges contribute to significant cost savings in pipeline projects.

Improved Safety: Proper alignment of bolt holes reduces stress and potential leakage risks, enhancing the overall safety of the pipeline system.

Versatility: Swivel flanges are adaptable to a variety of industrial applications, accommodating different sizes, pressure ratings, and customization needs.

Swivel flanges play a vital role in offshore and subsea pipeline operations, offering unparalleled flexibility and efficiency in bolt hole alignment. Their robust design and versatile applications make them an essential component in high-pressure and large-diameter pipeline systems across various industries. By understanding the features and benefits of swivel flanges, industry professionals can better appreciate their value in enhancing the safety and efficiency of pipeline installations.

As an expert in the field of pipeline systems, Haihao Group’s swivel flanges have been widely used in submarine pipeline projects.  If you want to know more about our products, please feel free to contact us.