S32760 Super Duplex Threaded Flanges for Offshore Oil and Gas

Designed for offshore platform maintenance, FPSO vessel manifold tie-ins, and process skids, Dafugui's S32760 Super Duplex Threaded Flanges for Offshore Oil and Gas help operators mitigate hot-work hazards in volatile hydrocarbon areas. Each flange features precision-machined internal NPT or BSPT threads produced on CNC turning centers, providing a mechanical connection with matching threaded pipe ends. Solid-forged from UNS S32760 alloy, this product line offers structural resistance against cyclic ocean wave motion and marine atmosphere degradation.

Offshore Marine Engineering

• Eliminates On-Site Hot Work Requirement: Features precision-machined internal threads (NPT/BSPT compliant with ASME B1.20.1) that join directly to matching pipe threads. This design removes the need for open-flame field welding and avoids localized heat-affected zone (HAZ) softening on offshore structures.

• High Yield & Tensile Stamina: S32760 Super Duplex Threaded Flanges for Offshore Oil and Gas manufactured from forged UNS S32760 (F55) super duplex steel, achieving a nominal yield strength ≥ 550 MPa—substantially higher than conventional 316L stainless steel. This allows optimized wall thickness design on weight-sensitive topside modules.

• Marine Corrosion Protection: Designed with a Pitting Resistance Equivalent Number (PREN) exceeding 42 (PREN = %Cr + 3.3%Mo + 16%N + 1.6%W), these flanges resist micro-biological corrosion, salt spray deposition, and sour crude streams containing dissolved H₂S and CO₂.

Standards & Material Compliance

Zhejiang Dafugui S32760 Flanges Details

Zhejiang Dafugui S32760 Flanges PROCESS flow

Offshore-Specific Quality Protocols

• Non-Destructive Testing (NDT): 100% Ultrasonic Testing (UT) and Liquid Penetrant Testing (PT) performed in accordance with ASME Section V to verify internal forging soundness and surface integrity.

• Microstructure & Phase Analysis: Metallographic evaluation conducted per ASTM E562 to verify a balanced 40%–60% ferrite-austenite matrix, preventing brittle intermetallic phase formation.

• Thread Profile Calibration: Internal threads audited with calibrated GO/NO-GO plug gauges to ensure reliable field thread engagement.

Factory Manufacturing Focus

• Forging & Heavy Machining Facility: Operating a modern 5,000 m² facility located 3 km from Wenzhou Airport, Dafugui utilizes high-tonnage forging equipment to ensure dense grain alignment required for marine vibration environments.

• Offshore Coating & Surface Finish: Flange sealing faces and threads receive protective treatments to withstand ocean transit and storage under high-humidity conditions.

Marine Logistics Information

• Minimum Order Quantity (MOQ): 1 Piece (Accommodating emergency maintenance and offshore skid retrofits)

• Delivery Lead Time: 15–30 days for standard stock; 35–45 days for custom forged sizes

• Documentation Pack: EN 10204 Type 3.1 MTC, UT/PT Test Reports, PMI Chemical Analysis Certificate

• Packaging Protection: VCI anti-corrosion barrier wrapping inside ISPM 15 compliant, heavy-duty wooden crates suitable for sea freight

Frequently Asked Questions

• Why are S32760 Super Duplex Threaded Flanges for Offshore Oil and Gas preferred for offshore retrofit projects?
Offshore platforms impose strict fire safety controls. Threaded flanges allow field engineers to complete piping tie-ins or emergency repairs without issuing hot-work permits or requiring post-weld heat treatment.

• What torque and assembly guidelines should be followed during installation?
Technicians should clean thread profiles and apply an approved anti-seize paste or PTFE thread compound to prevent thread galling under high-torque makeup.

• Can Dafugui manufacture Class 1500# RTJ threaded flanges for subsea top-side manifolds?
Yes. We precision-machine Ring Type Joint (RTJ) grooves directly onto high-pressure S32760 threaded flanges according to ASME B16.5 standards.