European Standard EN 1092-1 — Flanges for pipes — Requirements for steel flanges are specified according to their nominal pressure (PN) and size (DN). Plate flange for welding is the type 01 in EN1092-1. It is one of the most commonly used flanges in industries. Plate flanges are usually used in industrial pipelines, industrial boiler&tank, or matching with valves etc.

Some datas about plate flange for welding EN1092-1

Product name:	Plate flange for welding EN1092-1
Manufacturing Standard:	EN1092-1
Material Standard:	C22/CK22, P235GH/S235, DIN17200, F304/304L, F316/316L etc.
Size Range:	1/2”, 1”, 11/4”, 11/2”, 2”, 3”, 4”, 6”, 8”, 10”, 12”, 16”, 18”, 20” to 48”. (DN15-DN1200)
Pressure:	PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100, PN160, PN250, PN320, PN400
Surface Coatings:	Black painting, anti-rust oil, epoxy coated, galvanized and yellow painting.

What are the differences between plate flanges FF and RF?

“FF” and “RF” are all the sealing faces of plate flanges. Plate flange FF is called EN1092-1 type 01A and RF is called EN1092-1 type 01B.

The first and most widely used TYPE is EN 1092-1 Type 01A flat welded flange.

The label of flange provides a lot of information: EN 1092-1 is the production standard, type 01 means it is a welded flange, and A means flat sealing face. These flanges are used to join pipes and welded by overlap welding. And then they are connected by bolts.

Flat flanges conforming to EN1092-1 Type 01A are designed to connect piping, valves, fittings and pumps together. The connection is achieved by through overlap welding. The commonly adopted pressure is PN10, PN16, PN25, and PN40, the diameter is from DN15-DN1200.

The second type of flange is also flat welded flange (Type 01), but their sealing face is different from the previous one because they have a raised face called type 01B. The EN 1092-1 Type 01B RF flanges have a low pressure relief ring around the center hole of the flange, which is useful and convenient for checking the position of the gasket. They are also welded by overlap welding and connected by bolts together.

Raised face flanges conforming to EN1092-1 Type 01B are designed to connect piping, valves, fittings and pumps together. The surfaces of the gaskets are raised above the bolted circular surface and the commonly adopted pressure is PN10, PN16, PN25, and PN40, the diameter is from DN15-DN1200.

What are the features of flat welding flange?

Flat welding flange is suitable for low pressure grade, pressure fluctuation, vibration and shock are not serious in the pipeline system. The advantages of flat welding flanges are that they are easier to center, and the price is relatively cheap, so it has been widely used.

The disadvantages of plate flanges:

First, the rigidity is poor, do not use in hazardous occasions.
Second, They are more likely to bump in transportation because of the shape features.
Third, the main design disadvantage of flat welded flanges is that they cannot guarantee no leakage.

JIS Steel Flange Flat Welding Flange is a disk-like parts, in the pipeline engineering is the most common, flange is used in pairs, in the pipeline engineering, flat welding flange is mainly used for pipe connection, in the need to connect the pipeline on both sides of the installation of a flange, low pressure pipe can be used wire connection flange, 4 kg above the pressure of the use of welding flange, two pieces of flange with a gasket, and then fastened with bolts, different pressure flange has different thickness and the use of different bolts.

JIS Steel Flange Process Requirements
JIS Steel Flange Flat welding flange Forging process can be divided into forging, upsetting, extrusion, die forging, closed die forging, closed-type upsetting, closed die forging and closed upsetting because there is no flying edge, the material utilization rate is high, with a process or several processes may complete the complex forgings finishing, because there is no flying edge, The force area of the forgings will be reduced, the required load will also be reduced, however, should be careful not to make the blank completely limited, to strictly control the volume of the billet, control the relative position of the forging die and the measurement of forgings, and strive to reduce the wear of forged die, flat welding flange at low temperature forging, the size of the flange forgings produced by our company is very small, the forging with less than 700 ℃, and the surface no decarburization phenomenon.

JIS Steel Flange and Butt welds are welding methods for flanges and piping connections, flat welding flange welding only need a single side of the welding pipe and flange is not required to connect the inner mouth, welding flange welded installation needs flange double-sided welding, so the flat welding flange is generally used for low, medium pressure pipeline, butt welding flange for the high pressure pipe connection, the butt weld flange is generally at least PN2.5 PA, and the butt weld is used to reduce stress concentration.

JIS Flange Flat welding flange is divided into the following categories of main functions:
1. Pipeline failure, easy to disassemble detection
2. Connecting the pipe and keeping the pipeline good sealing performance
3. If a section of the pipeline problems, to facilitate the replacement of a section of the pipeline

JIS Steel Flange flat welding flange in the production and processing points:
1. The butt weld of the ring should be welded after welding, and make 100%-ray or ultrasonic flaw detection, and the radiographic inspection conforms to class II requirements, ultrasonic flaw detection conforms to Grade I requirement, the welding flange uses certain welding standard and the technical production processing, conforms to the national corresponding production standard and the request.
2. The production of flat welding flange plate should be ultrasonic flaw detection, no delamination defects, to ensure good quality and performance problems, according to a certain quality requirements of production and testing, to ensure the production and use of steel plate without quality problems.
3.It should be cut into strips along the rolling direction of steel, welded into a circular shape by bending, and the surface of the steel formed a ring of the cylinder, in the production of Hafaran should not be used in steel DINGXIANG flange plate directly machined into the neck flange, using a certain process production and processing.

Our company some type pipe flanges:

Blind flange	Weld Neck Flange	Slip On Flange	Lap Joint Flange	Socket Weld Flange

Some type steel flanges and different size:
carbon steel JIS flange
Stainless steel JIS flange
carbon steel JIS 10K flange
carbon steel JIS 5K flange

DIN steel Flange is a very popular in the world a kind of flange, become the German standard flange. Before the flange standard for DIN2501, 2633, 2634 and so on, now universal flange standard is DIN EN 1092.Our company has 36 years of production of flange, in China enjoy a high reputation, is PetroChina, Sinopec’s member units. Export Flange 15, in the international also participated in many large-scale projects. has passed the ISO and CE certification, products in line with international standards, advanced technology and reasonable price, is a lot of engineering and inventory business customers the best partner.

Parameters of DIN steel Flange:
Compressive strength: pn6-pn160 grade: Excellent material: carbon steel, stainless steel, alloy steels
Origin: Hebei
Model: TYP 1, TYP 5,typ, TYP12, TYP 13 types: Plane, surface, bump surface, tenon groove surface, Ring connection surface Diameter: According to the standard and drawing
brand: Metleader
Standard: DIN EN1092 connection
Mode:Butt Welding
Product specification: DN15-dn3000 Special functions: Good elasticity, corrosion resistance, high pressure

The differences between ASME flange and DIN flange
American Standard Flange (ANSI) Pressure Rating: Class 150 300 400 600 900 1500 2500 Total 7
Corresponding pressure levels PN 2.0, 5.0, 6.8, 10.0, 15.0, 25.0, 42.0 MPa
European-standard Flange (DIN) Pressure rating: PN 0.1 0.25 0.6 1.0 1.6 2.5 4.0 6.3 10.0 16.0 25.0 MPA Total 12
European-standard system and the United States standards system, whether flange or pipe, can not be mixed use. American national standard ANSI B16.5 steel pipe FLANGE and flange pipe fittings, is a more mature, more complete, more popular international advanced standards.
ANSI B16.5 with other related ANSI, ASTM, API, MSS pressure Piping Application standard system formed on the basis of a large number of research experiments, has decades of practice testing, is a relatively advanced, scientific standards, widely accepted by other countries in the world.

The characteristics and service life of the DIN flange summer testing are related to these factors
In the summer when the flange in the installation and use, the flange is often to detect the tightness, in the industrial field, the role of the flange is very obvious, often used in sealed containers, the container flange is also known as equipment flange, is generally the equipment body parts associated with the flange, pressure vessel flange is a device in the flange of the pressure properties of a type.

Often many of the container leakage is connected with the flange, because the flange joint seal failure Light causes energy, raw material waste, heavy will lead to equipment scrap, shutdown, casualties and serious environmental pollution. Flange in use usually have matching gasket, gasket is a kind of plastic deformation, and has a certain strength of the material made of the ring, most of the gaskets are from non-metallic plates, or by professional factory according to the specified size, the material for asbestos rubber plate, asbestos plate, PTFE plate, polyethylene board, etc. Also useful thin metal plate (tin, stainless steel) asbestos and other non-metallic materials wrapped up in the metal package gasket, there is a thin steel belt and asbestos belt around the wound-type gasket, the most commonly used is stainless steel belt and graphite wound metal wound gasket, depending on the use of the environment, winding belt can also use asbestos, ordinary rubber gasket for temperature less than 120 ℃ occasions, asbestos rubber gasket for water vapor temperature less than 450 Dingxiang flange ℃, oil temperature is less than 350 ℃, pressure less than 5MPa occasions, for the general corrosive medium, the most commonly used is acid-resistant asbestos plate.

High pressure vessel flange is used for the nominal pressure of 0.25-1.6mpa, the operating temperature is higher than the -20℃~300℃ steel pressure vessel, a flat welding flanges. Therefore, as the industrial field, the flange connection should be checked regularly, found that there is a bubble in the flange weld, the leakage of the flange for the surface with neck flat welded steel pipe flange, the material is 304 of its contact medium for gaseous vinyl chloride monomer (VCM) and water, the design pressure is 1.4MPa, the maximum working pressure is 1.1MPa, the reaction temperature is 64.7 ℃, the temperature range is 30~70℃.

Our company some type pipe flanges:

Stainless steel slip on flange	Blind flange	Weld neck flange	Plate flange	Threaded flange

Some type steel flanges and different size:
carbon steel AWWA hub flange
carbon steel AWWA ring flange
140 inch steel AWWA flange
60 inch steel AWWA flange