What is DIN EN 1092-1?
DIN EN 1092-1 is a European standard that specifies the requirements for circular flanges for pipes, valves, fittings, and accessories. It is titled "Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 1: Steel flanges."
This standard defines various types of flanges, such as weld neck, slip-on, threaded, and blind flanges, and their dimensions, materials, and pressure ratings. It provides guidelines for the design, dimensions, and marking of flanges used in piping systems across Europe.
The "PN" designation in the title refers to the pressure rating of the flanges, which stands for "Pressure Nominal." DIN EN 1092-1 establishes a unified system for specifying flanges within the European Union, promoting consistency and interoperability in the design and installation of piping systems.
| EN 1092-1:2018 Table 1- Methods of manufacture | ||||||
| Type of Flange and Collar | Forged (a) | Cast | Made from flat products (plates) |
Machined from rolled or orged bars and forged sectional stee |
Bentand electric welded form bars sectional stee or strip (b,c,d,e) |
Pressed from welded or seamless pipes or lat products |
| 01(Plate flange for welding | yes | no | yes | yes | yes | no |
| 02(Loose plate flange for Types 32-37) | yes | no | yes | yes | yes | no |
| 04(Loose plate flange for Type 34) | yes | no | yes | yes | yes | no |
| 05(Blind flange) | yes | no | yes | yes | no | no |
| 11(Weld-neck flange | yes | no | no | yes | yes,for≥DN700 | no |
| 12(Hubbed slip-on flange forwelding | yes | no | no | yes | no | no |
| 13(Hubbed threaded flange | yes | no | no | yes | no | no |
| 21(Integral flange) | yes | yes | no | yes | no | no |
| 32(Weld-on plate collar) | yes | no | yes | yes | yes | no |
| 33 (Lapped end pipe) | yes | no | yes | no | yes | yes |
| 34(Weld-neck collar) | yes | yes | no | yes | yes | no |
| 35(Weldingneck) | yes | no | yes | yes | yes | no |
| 36(Pressed collar with long neck) | yes | no | no | no | yes | yes |
| 37 (Pressed collar) | yes | no | yes | yes | yes | yes |
EN 1092-1 Types of steel flanges and collars
| EN 1092-1:2018 Types of steel flanges and collars | |
| Type No | Description |
| 1 | Plate flange for welding |
| 2 | Loose plate flange with weld-on plate collar or for lapped pipe end |
| 4 | Loose plate flange with weld-neck collar |
| 5 | Blind flange |
| 11 | Weld-neck flange |
| 12 | Hubbed slip-on flange for welding |
| 13 | Hubbed threaded flange |
| 21 a | Integral flange |
| 32 b | Weld-on plate collar |
| 33 a, b | Lapped pipe end |
| 34 b | Weld-neck collar |
| 35 b | Weldring neck |
| 36 b | Pressed collar with long neck |
| 37 b | Pressed collar |
| NOTE Type numbers have been made non-consecutive to permit possible future additions. a This is an integral part of a pressure equipment or a component. b Type numbers 32, 33, 35, 36 and 37 are for use with type 02 flanges and type number 34 for use with type 04 flanges. |
|
DIN EN 1092-1 vs. Previous DIN Norm: Understanding Differences in Flange Standards
Flange Types and Markings:
Previous DIN Norm: Flanges were classified using DIN standards such as DIN 2635 and DIN 2633, each with its own type and marking system.
DIN EN 1092-1: Adopts a unified classification system where flange types are designated with numbers, such as Type 11 for weld neck flanges and Type 05 for blind flanges.
Pressure Ratings:
Previous DIN Norm: Flanges were standardized based on nominal pressure ratings like PN6 and PN40.
DIN EN 1092-1: Uses a similar nominal pressure (PN) system but standardizes it across Europe, ensuring consistency in pressure ratings for flanges.
Size and Material Compatibility:
Previous DIN Norm: Some flange sizes from previous DIN standards may still be in use alongside new DIN EN 1092-1 sizes.
DIN EN 1092-1: Introduces new flange sizes that may not have existed in the previous DIN standards, providing a wider range of options for users.
Transition Period and Coexistence:
Transition Period: While some DIN flange standards have been replaced by DIN EN 1092-1, others continue to coexist due to the challenges of changing long-standing product standards.
Coexistence: Flanges may conform to either the old DIN standards, the new DIN EN 1092-1 standard, or both, depending on the manufacturer and regional requirements.
Flanges DIN EN / DIN
|
Design |
According to EN Type |
According to DIN |
|
Weld Neck Flange |
11 |
2627 - 2638 |
|
Blind Flange |
05 |
2527 |
|
Threaded Flange |
12 |
2558, 2565 - 2569 |
|
Flat Flange |
01 |
2573, 2576 |
|
Lapped Flange |
02 |
2641, 2642, 2655, 2656 |
|
Lapped Flange |
04 |
2673 – 2676 |
Flange ASME / BS / API
|
Design |
ASME |
|
Weld Neck Flange |
B 16.5 / 16.47 |
|
Blind Flanges |
B 16.5 / 16.47 |
|
Slip-on Flanges |
B 16.5 |
|
Lap Joint Flanges |
B 16.5 |
|
Threaded Flanges |
B 16.5 |
|
Socket Welding Flanges |
B 16.5 |
|
Lon Welding Neck Flanges |
B 16.5 |
|
Orifice Flanges |
B 16.36 |
|
Spectacle Blind |
B 16.38 |
Forms of Seal (Forms: types of contact faces)
|
Old DIN |
|
DIN EN 1092-1 |
|
Form A |
without Raised Face |
Form A |
|
Form B |
||
|
Form C |
Raised Face (Rz = 160 Mechanical Turned) |
Form B1 |
|
Form D |
Raised Face (Rz = 40 Mechanical Turned) |
|
|
Form E |
Raised Face (Rz = 16 Mechanical Turned) |
Form B2 |
|
Form F |
Tongue According to DIN2512 |
Form C |
|
Form N |
Groove according to DIN 2512 |
Form D |
|
Form V 13 |
Male according to DIN 2513 |
Form E |
|
Form R 13 |
Female according to DIN 2513 |
Form F |
|
Form R 14 |
Female according to DIN 2514 |
Form G |
|
Form V 14 |
Male according to DIN 2514 |
Form H |
Surface Roughness (Finish)
|
Roughness Design (Form) |
Ra (in Micrometers) |
Rz (in Micrometers) |
Old Norm |
||
|
|
Min. |
Max. |
Min. |
Max. |
|
|
A, B1, E, F |
3.2 |
12.5 |
12.5 |
50 |
Rz 40 - 160 |
|
B2, C, D, G, H |
0.8 |
3.2 |
3.2 |
12.5 |
Rz Max. 16 |
