Premium Cladded Swivel Flanges Delivered for a Singapore Offshore Maintenance Project
As part of a recent offshore maintenance operation in Singapore, Haihao Group successfully delivered a batch of custom cladded swivel flanges engineered to meet demanding subsea service conditions. The components were manufactured in strict compliance with API 17D requirements, ensuring reliable performance in high-pressure, corrosive offshore environments.
Project Background
The end user required several critical pipeline connection components for a replacement project on an offshore platform. Because the original equipment had experienced severe corrosion over years of service, the client needed upgraded flanges with stronger corrosion protection and enhanced service life-especially in areas exposed to seawater, sour media, and cyclic mechanical loads.
To meet these requirements, Haihao Group proposed swivel flanges with corrosion-resistant alloy (CRA) cladding, manufactured to updated API 17D standards.
API 17D swivel flange with UNS S32760 and Inconel 625 overlay manufactured by Haihao Group for 10,000-psi offshore service
Customized Swivel Flange Solution
The supplied swivel flanges were designed for flexible connection in subsea and topside piping systems. Key features of the Haihao solution include:
1. API 17D-Compliant Structure
The flanges were produced to the dimensional and mechanical specifications of API 17D, a standard widely used for subsea wellhead and tree equipment. This ensures full compatibility with existing offshore systems.
2. CRA Cladding for Extended Service Life
To strengthen corrosion resistance, the sealing surfaces were cladded using nickel-based alloy surfacing, providing superior protection against seawater, CO₂, and H₂S corrosion.
This is particularly beneficial for offshore platforms where downtime caused by corrosion-related failures can be costly.
3. Precision Machining & Rigorous Testing
Each swivel flange underwent:
- UT and PT inspections
- Dimensional verification
- Hydrostatic pressure testing
- Surface roughness and hardness checks
These quality-control steps ensured that every flange met the client’s strict operational requirements.
4. Tailored Dimensions & Assembly
The product was delivered as a complete two-piece swivel ring assembly, allowing easier installation even in confined offshore spaces. All dimensional tolerances were customized to match the client’s existing pipeline layout.
Reliable Delivery for Offshore Operations
Given the project’s time-sensitive nature, Haihao Group coordinated production, inspection, and packaging under a tight schedule. The goods were delivered on time and prepared with sea-worthy protection, including anti-corrosion coatings, plywood cases, and customized supports to secure each flange during transportation.
Commitment to Offshore Piping Solutions
Haihao Group has long been a trusted supplier for offshore operators, EPC contractors, and equipment manufacturers. By integrating forging, CRA cladding, machining, welding, and testing under one system, the company continues to provide high-integrity components tailored for demanding marine and subsea conditions.