Last December, we offered a quotation about EN 1092-1 flanges from one of our valuable clients. As usual, the client stated clearly their requirements on these flanges and confirmed that we would satisfy the needs. Then in January, we received purchase order and proceeded according to client’s demand. As this batch of flanges will be used for hydro test, we arranged extra inspection report for our client.
Flanges List
| Item | Description of Goods | Qty | Unit |
| 1 | WN Flange DN 25 PN40, EN 1092-1 P280GH | 52 | pcs |
| 2 | WN Flange DN 50 PN40, EN 1092-1 P280GH | 24 | pcs |
| 3 | WN Flange DN 65 PN40, EN 1092-1 P280GH | 18 | pcs |
| 4 | Blind Flange DN 40 PN40, EN 1092-1 P280GH | 26 | pcs |
| 5 | Blind Flange DN 65 PN40, EN 1092-1 P280GH | 20 | pcs |
EN1092-1 Standard
EN 1092-1 is the European standard for circular steel flanges with nominal sizes from DN 10 to DN 4000. This standard covers pressure ratings from PN 2.5 to PN 400 and temperature ranges from -50°C to +600°C. As part of the broader European pressure equipment directive framework, EN 1092-1 provides specifications for flange dimensions, materials, pressure-temperature ratings, and sealing surfaces.
The standard classifies flanges into multiple types based on their construction and application requirements. Among these, Type 11 flanges represent a specialized category designed for specific industrial applications requiring robust performance under demanding conditions.
EN1092-1 Type 11 Flanges
Type 11 flanges, as defined in EN 1092-1, are welding neck flanges with a raised face and serrated finish. These flanges feature:
- Long tapered hub that provides stress distribution
- Welding bevel for butt welding to piping
- Raised face (typically 1-2 mm height)
- Serrated finish (spiral or concentric grooves) for improved gasket retention
- Full penetration weld capability for high-integrity connections
Key Characteristics of EN1092-1 Type 11 Flanges
- Pressure Ratings: Available in PN 6, PN 10, PN 16, PN 25, PN 40, PN 63, PN 100, PN 160, PN 250, PN 320, and PN 400
- Temperature Range: Suitable for -50°C to +550°C depending on material grade
- Size Range: DN 10 to DN 2000
- Bolt Hole Configuration: Even number of bolt holes following EN 1092-1 drilling patterns
EN10222-2 P280GH Material
P280GH is a pressure vessel steel plate material specified in EN 10222-2 standard. This material is specifically designed for pressure equipment operating at elevated temperatures.
P280GH Chemical Composition
| Element | Composition % |
| C | 0.08-0.20 |
| Si | 0.40 max |
| Mn | 0.90-1.50 |
| P | 0.025 max |
| S | 0.015 max |
| Alt | ≥0.020 |
| N | ≤0.012 |
| Cr | ≤0.30 |
| Cu | ≤0.30 |
| Mo | ≤0.08 |
| Nb | ≤0.01 |
| Ni | ≤0.30 |
| V | ≤0.02 |
| Ce | 0.45 max |
P280GH Mechanical Properties
| Property | Requirement |
| Yield Strength (Renb) | ≥ 280 MPa |
| Tensile Strength (Rm) | 460-580 MPa |
| Elongation (A) | ≥ 23% |
| Impact Energy (KV) | ≥ 40 J at -20°C |
Advantages of EN 1092-1 Flanges in P280GH
- Cost-Effectiveness: Non-alloy steel provides good properties at lower cost
- Weldability: Easily welded to carbon steel piping without special procedures
- Temperature Performance: Suitable for most industrial applications up to 400°C
- Availability: Widely available in European markets
- Standard Compliance: Fully compliant with European pressure equipment directives
Inspection Photos
