What is EN1092-1 Slip-On Flanges?

EN1092-1 Slip-On Flanges (Type 01) are standardized steel pipe flanges, designed and manufactured in strict accordance with EN1092-1 European standard for wrought steel flanges and their joints. As a widely applied connection component in industrial piping systems, they are recognized for their cost-effectiveness, simplified installation process, and reliable sealing performance. Thus they are preferred choice for medium and low-pressure industrial applications across global markets.

Design Features of Type 01 Slip-On Flanges

The design specification of EN1092-1 Slip-On Flanges Type 01 is defined by the European Committee for Standardization (CEN), ensuring uniform dimensional tolerances, material requirements, and performance benchmarks.

Unlike weld neck flanges, Type 01 slip-on flanges feature a straightforward structure: the flange is slipped over the outer surface of the connecting pipe, then secured with fillet welds on both the inner and outer circumferences of the flange hub. This design reduces installation complexity, shortens construction time, and lowers welding requirements. Besides, it maintains sufficient structural integrity for standard industrial operating conditions.

Sealing Surface Options for EN1092-1 Flanges

The sealing surface of EN1092-1 Slip-On Flanges Type 01 follows EN1092-1 standard specifications, typically adopting a type A-flat face (FF) or type-B raised face (RF) design.

Type A: The flat face (FF) is suitable for low-pressure (PN≤10) and non-toxic media pipelines, ensuring simple sealing with standard gaskets.

Type B: The raised face (RF) is designed for medium-pressure (PN10-PN16) systems, providing enhanced sealing performance by increasing the contact pressure between the flange and gasket.

Both designs are compatible with EN-standard gaskets (non-asbestos, PTFE, graphite), effectively preventing media leakage and ensuring compliance with industrial safety requirements.

EN Approved Material for Flanges Type 01

Materials for EN1092-1 Slip-On Flanges comply with European material standards and EN1092-1 specification requirements, with carbon steel as the primary option for general industrial use. The core European material grades include EN 10025 S235JR, S275JR (carbon structural steel), EN 10213 C22.8 (carbon steel for pressure equipment), and EN 10222-2 P235GH, P265GH (pressure vessel carbon steel). For corrosive media environments (such as petrochemical and marine pipelines), stainless steel grades EN 1.4301 (304 equivalent), EN 1.4401 (316 equivalent) are available. Alloy steel grades (e.g., EN 1.7182) are optional for high-temperature, medium-pressure industrial systems, ensuring full compatibility with EN1092-1 standard requirements.

PN16 EN1092-1 Type 01 Slip-On Flanges Dimension

PN16 DN	Mating dimensions					Bore diameters	Flange thickness
	Outside diameter D	Diameter of bolt circle K	Diameter of bolt hole L	Bolting
				Number	Size	B1	C1
10	90	60	14	4	M12	18.0	14
15	95	65	14	4	M12	22.0	14
20	105	75	14	4	M12	27.5	16
25	115	85	14	4	M12	34.5	16
32	140	100	18	4	M16	43.5	18
40	150	110	18	4	M16	49.5	18
50	165	125	18	4	M16	61.5	20
65	185	145	18	4 or 8	M16	77.5	20
80	200	160	18	8	M16	90.5	20
100	220	180	18	8	M16	116	22
125	250	210	18	8	M16	141.5	22
150	285	240	22	8	M20	170.5	24
200	340	295	22	12	M20	221.5	26
250	405	355	26	12	M24	276.5	29
300	460	410	26	12	M24	327.5	32
350	520	470	26	16	M24	359.5	35

Quality Control for EN1092-1 Flange

Quality control of EN1092-1 Flanges is implemented throughout the manufacturing process, in strict accordance with EN1092-1 and relevant European industrial standards. All flanges undergo strict dimensional verification to ensure consistency with EN1092-1 standard tolerances; material composition analysis is conducted to confirm compliance with specified European steel grades; and pressure testing (hydrostatic testing or pneumatic testing) is performed to verify sealing performance and pressure-bearing capacity.

Additionally, surface treatment (such as hot-dip galvanizing, anti-rust painting, or pickling and passivation) is available to enhance corrosion resistance and extend the service life of the flanges.

Where to Use Type 01 Slip-On Flange?

EN1092-1 Type 01 Slip-On Flanges are widely applied in industrial sectors that adopt European standards, including oil and gas transmission, petrochemical processing, power generation (thermal power, hydropower), water treatment, chemical engineering, and general manufacturing. Their adaptability to medium and low-pressure systems, combined with cost-effectiveness and easy installation, makes them an indispensable component in modern European-standard industrial piping networks.

Summary

EN1092-1 Slip-On Flanges Type 01 adhere to EN1092-1 European standards, featuring standardized design, compliant European material grades, reliable performance, and wide application scope. Whether for standard specifications or custom requirements, these flanges provide a practical and economical piping connection solution, fully meeting the high standards of global industrial customers who adopt European piping systems.

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