Non-standard Large Diameter SS316 Flanges
SSM specializes in manufacturing non-standard stainless steel 316 large diameter flanges, designed and produced according to customer drawings, special dimensions, or unique connection requirements. Our large flanges provide exceptional mechanical strength, corrosion resistance, and precision - ideal for heavy-duty industrial applications such as pipelines, pressure vessels, heat exchangers, and offshore installations.
Product Overview
Unlike standard ASME or EN flanges, non-standard SS316 flanges are custom-engineered for projects where size, pressure class, or connection type falls outside the limits of conventional standards (such as ASME B16.5 or ASME B16.47).
SSM's engineering team designs and machines each flange to meet specific operating conditions, ensuring compatibility, safety, and durability under extreme temperatures and pressures.
Technical Capabilities
| Specification | Description |
|---|---|
| Material | Stainless Steel 316 / 316L (ASTM A182 F316 / F316L) |
| Type | Weld Neck, Slip-On, Blind, Lap Joint, Socket Weld, or Custom |
| Size Range | Up to 3000 mm (120 inch) OD or customized |
| Pressure Rating | PN2.5 – PN400 / Class 150 – Class 2500 / Customized |
| Facing Type | RF (Raised Face), RTJ (Ring Type Joint), FF (Flat Face), Groove/Tongue |
| Standards | Based on ASME B16.5 / B16.47 / EN 1092-1 or custom drawing |
| Manufacturing Method | Forged or rolled plate flange, CNC machined to precision |
| Surface Finish | 3.2 μm Ra or as per client specification |
Key Features
Customizable Dimensions: Tailor-made to your drawing, pressure, and material requirements.
High Corrosion Resistance: SS316 provides excellent resistance to chloride and seawater corrosion.
Large Diameter Capability: Up to 3 meters OD for pipelines, tanks, and reactors.
Precision Machining: CNC accuracy ensures perfect bolt alignment and sealing.
Various Facing Options: RF, RTJ, or custom grooves for metal or soft gaskets.
Certified Quality: Manufactured in compliance with EN 10204 3.1 / 3.2, 100% inspected before delivery.
Applications
Chemical and Petrochemical Plants
Offshore and Marine Pipelines
Power Generation and Desalination Plants
Pressure Vessel Manufacturing
Water Treatment Systems
Heavy Machinery and Industrial Equipment
Quality Assurance
Every SSM custom large flange undergoes strict quality control:
Raw material PMI (Positive Material Identification)
Ultrasonic and dimensional inspection
Surface finish and flatness testing
Marking and certification according to project requirements
All flanges can be supplied with full documentation packages, including MTC (Material Test Certificate), NDT reports, and dimensional drawings.
Packaging & Delivery
Each flange protected with anti-rust coating
Flange faces covered with plastic protectors
Packed in strong export wooden cases or pallets
Fast global shipping with reliable logistics partners
Why Choose SSM
Over 30 years of experience in custom forging and machining
Large production capacity for oversized and heavy flanges
Engineering support for drawing design and standard conversion
Excellent global reputation in oil, gas, and chemical industries
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