Special Pressure Vessel Flanges
- Precise Dimensions: Tolerance within 0.05 mm to ensure tight, leak-free sealing on pressure vessels.
- Size Range: Up to 80 kg per flange or 50–1200 mm outer diameter.
- Premium Materials: Stainless steel and super duplex grades F55, F60, and 904L are available for aggressive media.
- Quality Surface Finish: Smooth, scratch-free sealing faces to minimise gasket wear and leakage risk.
- Pressure Service Ready: Engineered for boilers, reactors, columns and other high-pressure, safety-critical equipment.
Technical Specifications
| Parameter | Specification |
| Product name | Pressure Vessel Flanges |
| Diameter range | 50 mm – 1200 mm |
| Max single-piece weight | ≤ 80 kg |
| Dimensional tolerance | ≤ 0.05 mm (per drawing) |
| Typical pressure service | Medium to high-pressure vessels and piping |
| Available materials | Stainless steel, super duplex F55, F60, 904L |
| Manufacturing process | Forging + CNC machining + final inspection |
| Sealing faces | RF, RTJ, flat face, or per customer drawing |
| Standards/codes | Per customer requirement (e.g., ASME, EN, GB) |
| Surface condition | Machined, smooth, scratch-free sealing surface |
| Sample policy | 2 pcs free samples for pressure vessel flange projects |
| Packaging | Export wooden cases/pallets for sea or land transport |
Customization Options
- Custom flange dimensions (OD, ID, thickness, hub design) according to vessel nozzle drawings.
- Choice of sealing face type: RF, RTJ, FF, tongue-and-groove, or special profiles.
- Tailored bolt hole patterns, quantity, and bolt circle diameters.
- Material selection matching design code, corrosion allowance, and process medium.
- Optional heat treatment and hardness requirements as per engineering specification.
- Special coatings or surface treatments (passivation, anti-rust oil, etc.).
Applications
- Power station boilers, steam drums, and economisers.
- Petrochemical reactors, columns, and pressure vessels.
- Refinery separators, heat exchangers, and storage tanks.
- Fertiliser and chemical processing equipment.
- Offshore platforms and marine pressure systems.
- General high-pressure piping and vessel nozzle connections.
Raw Materials
We produce and purchase raw materials strictly according to customer requirements, ensuring full compliance with project specifications, mechanical properties, and international standards.
Main steel grades we produce:
Steel Grade | Standards | Classification | Products |
1.4301, 1.4307, 1.4401, 1.4404, 1.4541, 1.4871 | EN 10222-5 | L | Forged flanges and Forged parts |
F304, F304L, F316, F316L, F321, F316T, F310, F904L | ASTM A182 | L | Forged flanges and Forged parts |
F51, F53, F55, F60 | ASTM A182 | L | Forged flanges and Forged parts |
LF2 | ASTM A350 | V | Forged flanges and Forged parts |
F11, F22 | ASTM A182 | V | Forged flanges and Forged parts |
A105 | ASTM A105 | N | Forged flanges and Forged parts |
CNC Machining Capabilities
We operate multiple machining lines and CNC centers engineered to deliver tight tolerances, superior surface finishes, and consistent quality for complex forged components.
Equipments and Quantities | ||
Item No. | Equipments | Quantities |
1 | Ramp CNC lathe | 6 |
2 | Normal lathe | 8 |
3 | Machining center | 4 |
4 | CNC lathe | 10 |
Inspection & Quality Control
To ensure the high quality of non-standard flanges, we are equipped with professional testing and inspection systems:
- 3D Measurement Equipment
- Ultrasonic Cleaning Machine
- Physical & Chemical Testing
- Dimensional Inspection
Packaging for Non-Standard Flanges
We provide protective packaging options according to customer needs:
- Anti-rust treatment
- Plastic film wrapping
- Wooden cases
- Wooden pallets
- Custom packaging available
Why Choose Boberry
Complete In-House Manufacturing
Integrated forging, heat treatment, machining, and inspection ensure stable quality, faster lead times, and full control over every production stage.
European-Market Proven Quality
Long-term supply to Germany, Austria, Switzerland, and Nordic countries demonstrates our ability to meet strict technical standards and customer expectations.
Custom Engineering Support
Tailor-made stainless-steel parts based on your drawings, with trial samples available to validate design, performance, and fit before full-scale production.