ASME/ANSI Standard & Custom Engineered Non-Standard Industrial Flanges

As a leading flange manufacturer,we provide high-integrity connection solutions for critical piping systems. We specialize in bridging the gap between mass-produced standard flanges and the complex, high-precision requirements of “non-standard” industrial components.

From 1/2″ to 120″ diameters, our flanges are built to withstand extreme pressure and corrosive environments.

Technical Specifications

Factory-Direct Manufacturing Process

We don’t just supply; we manufacture. Our integrated production line ensures total quality control:

1. Raw Material Inspection: Ultrasonic testing of steel billets to ensure zero internal defects.

2. Forging: Precision forging at optimal temperatures to improve the grain structure and mechanical strength.

3. Heat Treatment: Normalizing, Quenching, and Tempering to achieve the required hardness and ductility.

4. CNC Machining: Advanced CNC vertical lathes ensure tolerances as tight as ±0.1mm for non-standard bolt patterns.

5. Surface Finishing: Multiple options to meet environmental requirements (see below).

6. Final QC: Dimensional check, PMI (Material Identification), and hydro-testing where required.

Surface Treatment & Corrosion Protection

To ensure long-term durability in offshore or chemical environments, we offer professional surface treatments:

• Anti-Rust Oil: Standard protection for short-term storage and shipping.

• Yellow/Black Paint: Enhanced visibility and basic corrosion resistance.

• Hot-Dip Galvanizing (HDG): Best for outdoor and high-humidity applications.

• FBE (Fusion Bonded Epoxy): Superior chemical and abrasion resistance for buried pipelines.

• Zinc Plating: For precision parts requiring a clean, metallic finish.

Industry Applications & Scenarios

• Oil & Gas Pipelines: High-pressure Weld Neck flanges for upstream and midstream transport.

• Chemical & Petrochemical: Corrosion-resistant stainless steel flanges for processing units.

• Power Generation: Heavy-duty flanges for steam lines and cooling systems in nuclear and thermal plants.

• Water Treatment & Desalination: Large-diameter non-standard flanges for high-volume saline water flow.

• Marine & Shipbuilding: Compact, lightweight custom designs for tight shipboard piping.

Case Study: 

Client: A European chemical refinery undergoing modernization.
Challenge: The facility had 40-year-old German equipment with non-standard flange dimensions that didn’t align with modern ASME or DIN standards. Off-the-shelf parts were impossible to find.
Solution: Ours engineering team analyzed the client’s physical site measurements and legacy blueprints. We manufactured 48 sets of custom transition flanges with mixed ASME/DIN drilling patterns.
Outcome: The client avoided a full system teardown, saving an estimated $200k in downtime. The custom flanges were delivered, tested, and installed within 25 days.

FAQ: Frequently Asked Questions

Q1: What is the difference between ASME B16.5 and ASME B16.47 flanges?
ASME B16.5 covers sizes from 1/2″ to 24″, whereas ASME B16.47 is specifically for large-diameter flanges from 26″ to 60″. B16.47 is further divided into Series A (MSS SP-44) and Series B (API 605), which have different bolt circle diameters and thicknesses.

Q2: Can you manufacture flanges based on custom drawings?
Yes. We specialize in non-standard industrial flanges. You provide the CAD drawing or specific dimensions (OD, ID, Thickness, Bolt Circle, and Hole Diameter), and our engineering team will provide a feasibility analysis and quote within 24 hours.

Q3: How do you ensure the sealing surface quality?
We offer various facing finishes, including Serrated Finish (Spiral or Concentric), Smooth Finish, and Cold Water Finish, adhering to the Ra 3.2–6.3 μm standard to ensure maximum gasket adherence and leak prevention.

Q1: Why choose a forged flange over a cast flange?
Forged flanges offer superior mechanical properties, including higher strength and better resistance to impact and vibration. Because the forging process eliminates internal porosity, they are the only choice for high-pressure or critical industrial applications.

Q2: What information is needed for a non-standard flange quote?
Please provide the Outside Diameter (OD), Inside Diameter (ID), Flange Thickness, Bolt Circle Diameter, Number of Holes, and Hole Diameter. If possible, sharing a CAD or PDF drawing ensures the highest accuracy.

Q3: Does RAYOUNG/JS FITTINGS provide 3.1 MTRs?
Yes. Every batch of flanges is tracked by heat number, and we provide a full EN 10204 3.1 Mill Test Report detailing the chemical composition and mechanical test results (tensile, yield, elongation, and hardness).