EN1092-1 Type 11 Weld Neck Flange

In the construction and maintenance of industrial piping systems, flanges serve as critical connecting components whose quality and performance directly impact the safe and stable operation of the entire system. Among numerous flange products, EN1092-1 weld neck flanges stand out due to their stringent standard specifications and exceptional performance characteristics, making them a highly favored choice in industrial applications. This article will comprehensively analyze the knowledge related to EN1092-1 Type 11 weld neck flange, starting from the EN1092 standard system, to help you gain a deeper understanding of this premium product.

EN1092 Standard System Introduction

The EN1092 series includes several parts, each covering a specific flange material type:

•EN 1092-1 applies to steel flanges, specifying flange types, dimensions, materials, manufacturing, inspection, and marking requirements. It is the primary standard for steel flange design and application.

•EN 1092-2 covers cast iron flanges, defining structural forms, tolerances, pressure ratings, material properties, and testing methods to ensure safe industrial use.

•EN 1092-3 addresses copper alloy flanges, outlining requirements for design, manufacturing, and inspection under various service conditions.

•EN 1092-4 applies to aluminum alloy flanges, specifying dimensional tolerances and pressure–temperature ratings. Due to their light weight and corrosion resistance, these flanges are mainly used in medium-to-low pressure and weight-sensitive applications.

EN1092-1 Standard Types of flanges

Type No.	Product Name	Key Features & Applications
Type 01	Plate flange for welding	Flat plate with fillet welds; low cost, low pressure use.
Type 02	Loose plate flange for lap joint (Types 32–37)	Used with stub ends; rotatable, easy alignment.
Type 04	Loose plate flange for weld-neck collar (Type 34)	Loose flange used with weld-neck collar.
Type 05	Blind flange	Solid flange for pipe end closure or testing.
Type 11	Weld-neck flange	Tapered hub; high strength for severe service.
Type 12	Hubbed slip-on flange for welding	Short hub; easy installation, medium duty.
Type 13	Hubbed threaded flange	Threaded bore; no welding required.
Type 21	Integral flange	Integral with equipment; material dependent.
Type 32	Weld-on plate collar	Stub end for lap joint flanges.
Type 33	Lapped end pipe	Formed pipe end; economical, limited pressure.
Type 34	Weld-neck collar	Weld-neck stub end for loose flanges.
Type 35	Welding neck	Short welding neck component.
Type 36	Pressed collar with long neck	Pressed long-neck stub end.
Type 37	Pressed collar	Pressed stub end for loose flanges.

EN 1092-1 Type 11 Weld Neck Flange Introduction

The EN 1092-1 Type 11 Weld Neck Flange is a high-performance flange designed with a long tapered hub that is welded directly to the pipe, ensuring excellent stress distribution and high strength. It is widely used in high-pressure, high-temperature, and cyclic load conditions across industrial piping systems, providing reliable sealing and long-term durability. This flange fully complies with the EN 1092-1 standard, making it a trusted choice for both European and international projects.

Application of Weld Neck Flanges in Piping Systems

Weld neck flanges are widely used in industrial piping systems that require high pressure, high temperature, or cyclic load resistance. Their long tapered hub ensures smooth stress transition between the flange and pipe, minimizing fatigue and leakage risks. Common applications include oil and gas pipelines, chemical and petrochemical plants, power generation systems, and high-pressure water or steam lines. These flanges provide reliable sealing, structural integrity, and long-term durability, making them a preferred choice for critical and demanding operations.

PN 16 Type 11 Weld Neck Flange Dimension

DN	Mating dimensions					Outside diameter of neck	Flange thickness	Length		Neck diameters	Corner radii
	Outside diameter	Diameter of bolt circle	Diameter of bolt hole	Bolting
	D	K	L	Number	Size	A	C2	H2	H3	N1	R1
10	90	60	14	4	M12	17.2	16	35	6	28	4
15	95	65	14	4	M12	21.3	16	38	6	32	4
20	105	75	14	4	M12	26.9	18	40	6	40	4
25	115	85	14	4	M12	33.7	18	40	6	46	4
32	140	100	18	4	M16	42.4	18	42	6	56	6
40	150	110	18	4	M16	48.3	18	45	7	64	6
50	165	125	18	4	M16	60.3	18	45	8	74	6
65	185	145	18	8b	M16	76.1	18	45	10	92	6
80	200	160	18	8	M16	88.9	20	50	10	105	6
100	220	180	18	8	M16	114.3	20	52	12	131	8
125	250	210	18	8	M16	139.7	22	55	12	156	8
150	285	240	22	8	M20	168.3	22	55	12	184	10
200	340	295	22	12	M20	219.1	24	62	16	235	10
250	405	355	26	12	M24	273.0	26	70	16	292	12
300	460	410	26	12	M24	323.9	28	78	16	344	12
350	520	470	26	16	M24	355.6	30	82	16	390	12
400	580	525	30	16	M27	406.4	32	85	16	445	12
450	640	585	30	20	M27	457.0	34	83	16	490	12
500	715	650	33	20	M30	508.0	36	84	16	548	12
600	840	770	36	20	M33	610.0	40	88	18	670	12
700	910	840	36	24	M33	711.0	40	104	18	755	12
800	1 025	950	39	24	M36	813.0	41	108	20	855	12
900	1 125	1 050	39	28	M36	914.0	48	118	20	955	12
1 000	1 255	1 170	42	28	M39	1 016.0	59	137	22	1 058	16
1 200	1 485	1 390	48	32	M45	1 219.0	78	160	30	1 262	16
1 400	1 685	1 590	48	36	M45	1 422.0	84	177	30	1 465	16
1 600	1 930	1 820	56	40	M52	1 626.0	102	204	35	1 668	16
1 800	2 130	2 020	56	44	M52	1 829.0	110	218	35	1 870	16
2 000	2 345	2 230	62	48	M56	2 032.0	124	238	40	2 072	16

EN 1092-1 Flange Face Types

Type	Flange Facing	Description
A	Flat Face (FF)	Flat sealing surface; gasket sits on full face. Used with flat gaskets.
B	Raised Face (RF)	Sealing surface raised above flange body; common type for bolted flanges.
C	Tongue Face	Raised tongue around bore for gasket positioning; pairs with groove face.
D	Groove Face	Matching groove for tongue face; improves gasket retention.
E	Spigot Face	Projects slightly to fit into mating flange; helps center joint.
F	Recess Face	Recessed surface matching spigot; holds gasket in place.
G	O-Ring Recess	Recess for O-ring; designed for elastomer O-ring sealing.
H	O-Ring Groove	Groove for O-ring; mates with O-ring recess face.

Advantages of Type 11 Flange

•Smooth stress distribution between flange and pipe.

•High strength and excellent pressure resistance.

•Suitable for high-pressure and high-temperature applications.

•Reliable sealing under cyclic or fluctuating loads.

•Long-term durability and structural integrity.

•Ideal for critical and demanding industrial operations.

15 12 月, 2025