CS SORF Flange – Complete Guide by Fortis Forge
Introduction
In industrial piping systems, flanges are critical for creating secure, leak-proof connections. Among the many options available, the CS SORF flange — short for Carbon Steel Slip On Raised Face flange — is one of the most widely used due to its ease of installation, versatility, and affordability.
At Fortis Forge, we design, manufacture, and supply CS SORF flanges in accordance with ASTM, ASME, ANSI, DIN, JIS, and EN standards. Our flanges are engineered to deliver consistent performance in industries such as oil & gas, petrochemicals, power generation, water treatment, and marine operations.
1. What Is a CS SORF Flange?
A CS SORF flange is a slip on flange made from carbon steel with a raised face sealing surface.
Slip On: The flange slides over the pipe before welding.
Raised Face (RF): A small raised section around the bore improves gasket sealing by concentrating pressure.
Key Features:
Dual welding (inside and outside) for strength.
Excellent sealing capability with raised face design.
Ideal for low- to medium-pressure applications.
2. Advantages of CS SORF Flanges
Cost-Effective – More affordable than weld neck flanges.
Enhanced Sealing – Raised face improves gasket compression.
Easy Installation – Less precision cutting required.
Wide Availability – Offered in a range of sizes and classes.
Durable Construction – Carbon steel ensures long service life.
3. Why Carbon Steel Is the Material of Choice
Strength – Suitable for high mechanical stress.
Temperature Performance – Operates well in hot or cold conditions.
Customizability – Easy to machine, drill, and coat.
Economical – Cost advantage over stainless steel.
Coating Options – Can be painted, epoxy-coated, or galvanized for corrosion resistance.
4. Types of CS SORF Flanges
At Fortis Forge, we supply:
Standard Raised Face SORF Flanges – Common in most industrial systems.
Custom Drilled SORF Flanges – Special bolt patterns for specific installations.
High-Pressure Rated SORF Flanges – For more demanding applications.
5. Standards & Specifications
Our flanges comply with:
ASTM A105, ASTM A350 LF2, ASTM A694
ASME B16.5 / B16.47
DIN, JIS, EN
Pressure Classes: 150, 300, 600, 900, 1500, 2500 lbs
Sizes: ½” to 60”
6. Manufacturing Process
Material Procurement – Certified carbon steel billets.
Forging – Enhances structural integrity.
Heat Treatment – Improves strength and toughness.
Machining – Ensures accurate bore, bolt holes, and raised face height.
Surface Finishing – Protective coatings applied.
Inspection – Dimensional and mechanical testing.
7. Applications of CS SORF Flanges
Oil & Gas Pipelines – Ideal for quick assembly in field operations.
Petrochemical Plants – Reliable sealing for process piping.
Water Treatment Systems – Leak-free pump and pipe connections.
Power Plants – Steam, condensate, and cooling water systems.
Marine Engineering – With coating, suitable for saltwater exposure.
8. How CS SORF Flanges Are Installed
Slide flange over pipe end.
Position correctly against mating flange or equipment.
Apply gasket between raised faces.
Weld inside and outside pipe-to-flange joint.
Tighten bolts to recommended torque.
9. Benefits for Maintenance & Operations
Easy Alignment – Perfect for projects with tight timelines.
Efficient Sealing – Raised face allows effective gasket compression.
Reusability – Can be removed and reused if in good condition.
Reduced Downtime – Quick installation speeds up project completion.
10. Quality Control at Fortis Forge
Every CS SORF flange undergoes:
Hydrostatic Leak Testing
Ultrasonic & Radiographic Testing
Tensile, Yield, and Hardness Testing
Dimensional Verification
MTC Issuance – EN 10204 3.1 / 3.2 compliance
11. Why Fortis Forge Is the Right Choice
Global Standards Compliance
Custom-Made Flanges – Tailored sizes, drilling, and finishes.
Ready Stock for Urgent Delivery
Competitive Pricing Without Compromising Quality
12. Maintenance Tips
Inspect raised face for damage before installation.
Choose gaskets suited to pressure and temperature conditions.
Retighten bolts after thermal cycling.
Apply protective coatings in corrosive environments.
13. FAQs
Q: Can SORF flanges handle high pressure?
A: Yes, but they are generally recommended for low- to medium-pressure service. High-pressure SORF variants are available.
Q: What gasket is best for SORF flanges?
A: Spiral wound gaskets are common for higher-pressure applications.
Q: Are CS SORF flanges suitable for seawater?
A: Yes, if coated or galvanized.
Conclusion
The CS SORF flange is a trusted solution in industries requiring dependable, cost-effective pipe connections with enhanced sealing performance. At Fortis Forge, we manufacture SORF flanges to exacting standards, ensuring they perform under demanding conditions while remaining budget-friendly. Whether for oil & gas, water treatment, or marine projects, our CS SORF flanges deliver the strength, reliability, and durability you need.