Swivel Flange

A swivel flange is a specialized flange system designed to simplify installation and alignment in complex piping environments. Also known as a swivel ring flange, this innovative design is widely used in offshore and subsea pipelines where precise bolt hole alignment is critical.

At Haihao Group, we manufacture high-quality swivel flange products engineered to meet demanding industry standards and project-specific requirements.

What Is a Swivel Flange?

A swivel flange consists of three main components:

• A forged outer ring flange
• A heavy forged welding hub (inner hub)
• A retainer ring

The key feature of a swivel flange is its rotating outer ring. The outer flange is held in place by the retainer ring and can rotate freely around the weld neck hub. This allows easy alignment of bolt holes during installation, especially in offshore conditions.

Structure and Design of Swivel Ring Flange

The structure of a swivel flange is designed for flexibility and strength:

• The inner weld neck hub is welded directly to the pipe
• The outer ring flange rotates freely for alignment
• The retainer ring secures the assembly while allowing rotation

This design makes the swivel flange highly efficient for installations where traditional flanges may cause alignment challenges.

Comparison with Lap Joint Flange

The swivel flange is often compared to a combination of a stub end and lap joint flange. However, there are important differences:

• A swivel flange is designed for higher pressure applications
• It is commonly used in offshore and subsea environments
• It provides better performance under extreme conditions

Because of these advantages, the swivel flange is the preferred choice for critical pipeline systems.

Applications of Swivel Flange

The swivel flange is widely used in industries where installation flexibility and reliability are essential:

• Offshore oil and gas platforms
• Subsea pipeline systems
• FPSO and floating production units
• Deepwater engineering projects

In these environments, the ability of a swivel flange to quickly align bolt holes significantly reduces installation time and operational risks.

Standards and Custom Manufacturing

Currently, there are no dedicated global standards specifically for swivel flange design. However, Haihao Group manufactures swivel flange products in accordance with recognized flange standards, including:

• ASME B16.5
• ASME B16.47
• API 6A
• MSS SP-44
• API 17D

We provide fully customized solutions to match required dimensions, pressure ratings, and gasket types.

Available Materials for Swivel Flange

Haihao Group offers a wide range of material options for swivel flange manufacturing to meet different project environments:

• Carbon Steel: ASTM A105N, A350 LF2 CL1
• High Strength Steel: A694 F52, F60, F65, F70
• Duplex & Super Duplex: A182 F51 (S31803), F53 (S32750), F55 (S32760)
• Stainless Steel: A182 F304/F304L, F316/F316L, F321, F347, F316Ti

These materials ensure excellent performance in corrosive, high-pressure, and low-temperature conditions.

Why Choose Haihao Group Swivel Flange?

Haihao Group is a trusted manufacturer of swivel flange products for global energy and industrial projects. We offer:

• Custom design for any size and pressure rating
• Advanced forging and machining capabilities
• Strict quality control and inspection
• Reliable export experience worldwide

Our swivel flange solutions are engineered to deliver durability, safety, and efficiency in the most demanding applications.