What Is a Type 11 Flange?

In today’s globalized industrial environment, the safety and reliability of piping systems are of paramount importance. As a core component of pipeline connection, EN1092-1 Type 11 flange has become one of the key components for connecting pipeline systems due to their unique design, reliable performance and wide range of applications. As a common flange type, weld neck flange comply with European standards and are widely used in many industries such as chemical, oil, gas, water supply and so on.

ZIZI specializes in the generation of flanges in various materials and types, in strict compliance with international standards (e.g. EN 1092-1, ASME B16.5, etc.), and provides high-quality piping connection solutions to customers all over the world.

Type 11 Weld Neck Flange：

Type 11 flange belongs to a type of flange under the European standard (EN 1092-1), which refers to “Weld Neck Flange”, it is a high-strength pipeline connectors, butt-welding structural design, the flange neck and the pipeline through the beveling weld to form a permanent connection to ensure that under high pressure, high temperature and dynamic loading conditions, excellent sealing and structural integrity. It ensures excellent sealing and structural integrity under high pressure, high temperature and dynamic loading conditions. The material is usually carbon steel and stainless steel, suitable for oil, gas, chemical and other industries in extreme working conditions.

What is the EN1092-1?

EN 1092-1 is a European standard that specifies requirements for the design, dimensions, materials, pressure ratings and types of sealing surfaces of steel flanges used in piping systems. The standard ensures the safety, reliability and interchangeability of flanges in different applications. Its main elements include:

•Nominal sizes: DN10 to DN4000.

•Pressure ratings: from PN2.5 to PN400.

•Sealing surface type: such as raised face (RF), flat surface (FF), ring joint surface (RTJ),etc.

•Sizes and bolt hole configurations: Standardized sizes and hole diameters ensure compatibility.

•Material and performance requirements: e.g. carbon steel, stainless steel, etc.

Specification of EN1092-1 Type 11 Flange:

Specification & Standard	DIN EN 1092-01 European Standard
Manufacturing Process	Hot forging / Steel casting / Hot rolling / Plate processing
Flange Outer Diameter	DN15 to DN4000
Pressure Rating	PN2.5, PN6, PN8, PN10, PN16, PN25, PN40, PN63, PN100, etc.
Flange Face	Flat face (FF), Raised face (RF), Male-Female (MFM), etc.
Value-Added Services	Rolling, Drilling, Punching, CNC machining, Sandblasting, Heat treatment, Anti-rust paint, Black oil paint, Yellow transparent paint, Galvanizing, Cold/hot-dip galvanizing
Flange Packaging	Bulk, Boxed, Wooden pallet, Wooden crate, Plastic wrap
Transport	Road transport, Sea freight, Air freight – Cargo planes / Passenger and cargo planes

EN1092-1 Weld Neck Flange Materials：

Carbon Steel	ASTM A105/A105N
low temperature steel	ASTM A350 LF2/LF3
Pipeline steel	ASTM A694 F42/46/52/56/65/70
Alloy steel	ASTM A182 F5/F9/F11/F12/F22/F91/F92
Stainless steel	ASTM A182 F304/304L/304H、F316/316L、F317、F310S、F321、F347、F904L
Duplex stainless steel	ASTM A182 F51/53/55/60

Dimension of EN1092-1 Type 11:

EN 1092-1 The specification of weld neck flanges mainly applies to the applicable nominal pressure from PN2.5 to PN400, and the nominal size from DN10 to DN4000, the following figure shows the size of DN10-DN500 under PN100.

DN	Mating dimensions					Outside diameter of neck A	Flange thickness	Length		Neck diameters	Corner   radii  R1	Wall thickness (see 5.6.1) S
	Outside diameter D	Diameter of bolt circle K	Diameter of bolt hole L	Bolting
				Number	Size		C2	H2	H3	N1
10	100	70	14	4	M12	172	20	45	6	32	4	See Annex A
15	105	75	14	4	M12	213	20	45	6	34	4
20	130	90	18	4	M16	269	22	48	8	42	4
25	140	100	18	4	M16	337	24	58	8	52	4
32	155	110	22	4	M20	424	24	60	8	62	6
40	170	125	22	4	M20	483	26	62	10	70	6
50	195	145	26	4	M24	603	28	68	10	90	6
65	220	170	26	8	M24	761	30	76	12	108	6
80	230	180	26	8	M24	889	32	78	12	120	8
100	265	210	30	8	M27	1,143	36	90	12	150	8
125	315	250	33	8	M30	1,397	40	105	12	180	8
150	355	290	33	12	M30	1,683	44	115	12	210	10
200	430	360	36	12	M33	2,191	52	130	16	278	10
250	505	430	39	12	M36	2,730	60	157	18	340	12
300	585	500	42	16	M39	3,239	68	170	18	400	12
350	655	560	48	16	M45	3,556	74	189	20	460	12
400	Only mating dimensions fixed, see Annex J.
500

Advantage of Type 11 Flange:

✅Standardized – Conforms to European harmonized standards (EN 1092-1), ensuring interchangeability and global availability.

✅High strength – Welded neck construction (WN) increases load carrying capacity for high pressure and high temperature applications.

✅Good sealing – Reduced risk of leakage due to the design of the raised face (RF) or ring-tie-jointed face (RTJ).

✅Corrosion resistance – Stainless steel, alloy steel and other materials are available to suit different media environments.

✅Easy Installation – Precise dimensional tolerances for easy centering and bolting.

Areas of Application：

•Oil & Gas

•Chemical Industry

•Power Industry

•Aerospace

•Water Treatment

22 7 月, 2025