A flange is a method of connecting pipes, valves, pumps and other equipment to form a piping system. It also provides easy access for cleaning, inspection or modification.
Pipe flanges are manufactured in all the different materials like stainless steel, cast iron, aluminium, brass, bronze, plastic etc. but the most used material is forged carbon steel and have machined surfaces. In addition, flanges, like fittings and pipes, for specific purposes sometimes internally equipped with layers of materials of a completely different quality as the flanges themselves, which are "lined flanges". The material of a flange, is basically set during the choice of the pipe, in most cases, a flange is of the same material as the pipe. All flanges, discussed on this website fall under the ASME en ASTM standards, unless otherwise indicated. ASME B16.5 describes dimensions, dimensional tolerances etc. and ASTM the different material qualities.
Size: 1/2" NB To 24" NB.
Class: 150#, 300#, 600#, 900#, 1500# & 2500#.
In addition, we also can produce the DIN flange, and the forgings according to the customers drawings, for example, rings and shafts.
1. Slip On flange 2. Filled weld outside 3. Filled weld inside 4. Pipe
The connection with the pipe is done with 1 fillet weld, at the outside of the flange. But before welding, a space must be created between flange or fitting and pipe.
ASME B31.1 1998 127.3 Preparation for Welding (E) Socket Weld Assembly says: In assembly of the joint before welding, the pipe or tube shall be inserted into the socket to the maximum depth and then withdrawn approximately 1/16" (1.6 mm) away from contact between the end of the pipe and the shoulder of the socket.
The purpose for the bottoming clearance in a Socket Weld is usually to reduce the residual stress at the root of the weld that could occur during solidification of the weld metal. The image shows you the X measure for the expansion gap.
The disadvantage of this flange is right the gap, that must be made. By corrosive products, and mainly in stainless steel pipe systems, the crack between pipe and flange can give corrosion problems. In some processes this flange is also not allowed. I am not an expert in this matter, but on the internet, you will find a lot of information about forms of corrosion. Also for this flange counts, that principle always firstly a pipe must be welded and then just a fitting.
1. Socket Weld flange 2. Filled weld 3. Pipe X = Expansion gap
Their pressure-holding ability is little, if any, better than that of Slip On flanges and the fatigue life for the assembly is only one tenth that of Welding Neck flanges.
They may be used at all pressures and are available in a full size range. These flanges slip over the pipe, and are not welded or otherwise fastened to it. Bolting pressure is transmitted to the gasket by the pressure of the flange against the back of the pipe lap (Stub End).
Lap Joint flanges have certain special advantages:
Freedom to swivel around the pipe facilitates the lining up of opposing flange bolt holes.
Lack of contact with the fluid in the pipe often permits the use of inexpensive carbon steel flanges with corrosion resistant pipe.
In systems which erode or corrode quickly, the flanges may be salvaged for re-use.
1. Lap Joint flange 2. Stub End 3. Butt weld 4. Pipe or Fitting
In a stainless steel pipe system, for example, a carbon steel flange can be applied, because they are not come in contact with the product in the pipe.
Although still available in most sizes and pressure ratings, screwed fittings today are used almost exclusively in smaller pipe sizes.
A threaded flange or fitting is not suitable for a pipe system with thin wall thickness, because cutting thread on a pipe is not possible. Thus, thicker wall thickness must be chosen...what is thicker ?
ASME B31.3 Piping Guide says:
Where steel pipe is threaded and used for steam service above 250 psi or for water service above 100 psi with water temperatures above 220° F, the pipe shall be seamless and have a thickness at least equal to schedule 80 of ASME B36.10.
From the standpoint of internal pressure and bolt loading, blind flanges, particularly in the larger sizes, are the most highly stressed flange types.
However, most of these stresses are bending types near the center, and since there is no standard inside diameter, these flanges are suitable for higher pressure temperature applications.
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- Materials for Flanges, Measure the size of a flange
- Pipe Flanges Raw Material Specifications
- Applications of flanges
- Flange Face Surface Finish
- Pressure Classes of Flanges
- Flanges Manufacturing Process
- Flange materials acc. to ASTM
- Stainless flange, Forged flange
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| Packing the pipe flange |
Below are our available industrial pipe flanges that will meet your project needs. We will help you put together your entire project and ship it to your closest port.
We ship globally! Contact us to speak with one of our experienced staff, who can help you with your project needs.
We ship globally! Contact us to speak with one of our experienced staff, who can help you with your project needs.
 | Blind Flanges>>The blind flange is used to close ends of piping systems. It is a kind of round plate with no center hold but with all the proper bolt holes. |
 | Figure-8 Blanks >>A figure-8 blank (also called a Spectacle Blind Flange) is a pressure-retaining plate with one solid end and one open end connected with a web or tie bar. |
 | Lap Joint Flanges >>The lap joint flange is practically identical to a slip-on flange except it has a radius at the intersection of the bore and flange face. |
 | Orifice Flanges >>Orifice flanges are used instead of the standard pipe flanges when orifice plate or flow nozzle is used. |
 | Reducing Flanges >>Reducing flanges are used in pipe-to-pipe connections. Reducing flanges are a little easier to bolt up than non-reducing flanges. |
 | RTJ Flanges >>Ring Type Joint Flange is a method of ensuring leak proof flange connection at high pressures. |
 | Socket Welding Flanges >>The socket welding flange is similar to a slip-on flange except it has a bore and a counterbore dimension. |
 | Slip-On Flanges >>The Slip-on flange has a low hub because the pipe slips into the flange prior to welding. |
 | Threaded Flanges >>Threaded (Screwed) flange is similar to the Slip-On flange, but the bore is threaded. |
 | Welding Neck Flanges >>The Welding neck flanges is normally referred to as the high hub flange. |
Size: 1/2" NB To 24" NB.
Class: 150#, 300#, 600#, 900#, 1500# & 2500#.
In addition, we also can produce the DIN flange, and the forgings according to the customers drawings, for example, rings and shafts.
- Delivery requirment:
- Marking: SunnySteel, material grade, standard, specification, heat no.
- Surface Treatment: Bright annealed, polished outside and inside surface.
- Package: Each pipe in a PVC bag and caps on both ends then bundled in wood case, (option: Bundle with knitted plastic bag/stee crate. )
- Inspection: Third party inspection, or by clints
General flange standards
All flanges are manufactured in accordance with industry-accepted standards.
Special flanges and fittings and custom forgings can be designed to meet any number of unique specifications and standards. Some common classifications for custom pipe flanges include:
TYPES OF FLANGES
Regardless of custom sizing or specifications, the fundamental design of most flanges falls under six common styles created to close, connect, cover, or support pipes and pipe systems.
Click on the links below to be taken to a page detailing the different types of flanges.:
- Slip-on Flanges - are all bored slightly larger than the O.D. of the pipe.
- Weld Neck Flanges - is normally referred to as the high hub flange.
- Blind Flanges - available to seal both pipes and vessels
- Lap Joint Flanges - available in a range of sizes to pair with stub end fittings for easy dismantling
- Threaded Flanges - engineered to fit pipes with external threads for weld-free fits
- Socket-weld Flanges - designed with a socket fit and top weld for ideal inner flow in pipe systems
All types except the Lap Joint flange are provided with a raised flange face.
Specialty flange
Except the most used standard flanges, there are still a number of specialty flange such as:
- Orifice Flanges generally come with either Raised Faces or RTJ (Ring Type Joint) facings.
- Long Weld Neck Flange is normally referred to as the high hub flange.
- Expander Flange is using a separate reducer-welding neck flange combination.
- NW Long Weld Neck Flange is a welding neck flange has a very long neck.
- Spectacle Blind Flange consist of a connected ring (spacer) and a plate (spade).
- Reducing Flange is used on projects that require the fitting together of different sized pipes.
- Weldoflange / Nipoflange is a combination of a Welding Neck flange and a supposedly Weldolet or Nipolet.
Material Grades and Performance
Custom pipe flanges can be manufactured from a wide variety of materials and material grades.
Carbon steel is a popular solution, as are stainless steel and specialty alloys, depending upon the industry.
Carbon steel is a popular solution, as are stainless steel and specialty alloys, depending upon the industry.
- Carbon Steel flanges - the main material is carbon steel flange or end flange connectors.
- Stainless Steel flanges - F304 F304L F316 F316L 316Ti, Copper etc.
- Alloy Steel flanges- accord to ASTM A182 F1, F5a, F9, F11, F12, F22, F91
- Forged flange- are perfectly finished with precision using the latest machinery.
- Large diameter flange -used to connect or to block off two very large diameters sized pipes.
Welding Neck flange
Welding Neck Flanges are easy to recognize at the long tapered hub, that goes gradually over to the wall thickness from a pipe or fitting.
The long tapered hub provides an important reinforcement for use in several applications involving high pressure, sub-zero and / or elevated temperatures. The smooth transition from flange thickness to pipe or fitting wall thickness effected by the taper is extremely beneficial, under conditions of repeated bending, caused by line expansion or other variable forces.
These flanges are bored to match the inside diameter of the mating pipe or fitting so there will be no restriction of product flow. This prevents turbulence at the joint and reduces erosion. They also provide excellent stress distribution through the tapered hub and are easily radiographed for flaw detection.
Details of Welding Neck flange
This flange type will be welded to a pipe or fitting with a single full penetration, V weld (Buttweld).
This flange type will be welded to a pipe or fitting with a single full penetration, V weld (Buttweld).
1. Weld Neck flange 2. Butt Weld3. Pipe or Fitting
Slip On flange
The calculated strength from a Slip On flange under internal pressure is of the order of two-thirds that of Welding Neck flanges, and their life under fatigue is about one-third that of the latter.
The connection with the pipe is done with 2 fillet welds, as well at the outside as also at the inside of the flange.
The X measure on the image, are approximately:
Wall thickness of pipe + 3 mm.
This space is necessary, to do not damage the flange face, during the welding process.
A disadvantage of the flange is, that principle always firstly a pipe must be welded and then just a fitting.
The connection with the pipe is done with 2 fillet welds, as well at the outside as also at the inside of the flange.
The X measure on the image, are approximately:
Wall thickness of pipe + 3 mm.
This space is necessary, to do not damage the flange face, during the welding process.
A disadvantage of the flange is, that principle always firstly a pipe must be welded and then just a fitting.
Details of Slip On flange
A combination of flange and elbow or flange and tee is not possible, because named fittings have not a straight end, that complete slid in the Slip On flange.
A combination of flange and elbow or flange and tee is not possible, because named fittings have not a straight end, that complete slid in the Slip On flange.
1. Slip On flange 2. Filled weld outside 3. Filled weld inside 4. Pipe
Socket Weld flange
Socket Weld flanges were initially developed for use on small-size high pressure piping.The connection with the pipe is done with 1 fillet weld, at the outside of the flange. But before welding, a space must be created between flange or fitting and pipe.
ASME B31.1 1998 127.3 Preparation for Welding (E) Socket Weld Assembly says: In assembly of the joint before welding, the pipe or tube shall be inserted into the socket to the maximum depth and then withdrawn approximately 1/16" (1.6 mm) away from contact between the end of the pipe and the shoulder of the socket.
The purpose for the bottoming clearance in a Socket Weld is usually to reduce the residual stress at the root of the weld that could occur during solidification of the weld metal. The image shows you the X measure for the expansion gap.
The disadvantage of this flange is right the gap, that must be made. By corrosive products, and mainly in stainless steel pipe systems, the crack between pipe and flange can give corrosion problems. In some processes this flange is also not allowed. I am not an expert in this matter, but on the internet, you will find a lot of information about forms of corrosion. Also for this flange counts, that principle always firstly a pipe must be welded and then just a fitting.
Details of Socket Weld Flange
Their static strength is equal to Slip On flanges, but their fatigue strength 50% greater than double-welded Slip On flanges.
Their static strength is equal to Slip On flanges, but their fatigue strength 50% greater than double-welded Slip On flanges.
1. Socket Weld flange 2. Filled weld 3. Pipe X = Expansion gap
Lap Joint flange
Lap Joint Flanges have all the same common dimensions as any other flange named on this page however it does not have a raised face, they used in conjunction with a "Lap Joint Stub End".Their pressure-holding ability is little, if any, better than that of Slip On flanges and the fatigue life for the assembly is only one tenth that of Welding Neck flanges.
They may be used at all pressures and are available in a full size range. These flanges slip over the pipe, and are not welded or otherwise fastened to it. Bolting pressure is transmitted to the gasket by the pressure of the flange against the back of the pipe lap (Stub End).
Lap Joint flanges have certain special advantages:
Freedom to swivel around the pipe facilitates the lining up of opposing flange bolt holes.
Lack of contact with the fluid in the pipe often permits the use of inexpensive carbon steel flanges with corrosion resistant pipe.
In systems which erode or corrode quickly, the flanges may be salvaged for re-use.
Details of Lap Joint Flange
These flanges are nearly identical to a Slip On flange with the exception of a radius at the intersection of the flange face and the bore to accommodate the flanged portion of the Stub End.
These flanges are nearly identical to a Slip On flange with the exception of a radius at the intersection of the flange face and the bore to accommodate the flanged portion of the Stub End.
1. Lap Joint flange 2. Stub End 3. Butt weld 4. Pipe or Fitting
Stub End
A Stub End always will be used with a Lap Joint flange, as a backing flange. This flange connections are applied, in low-pressure and non critical applications, and is a cheap method of flanging.In a stainless steel pipe system, for example, a carbon steel flange can be applied, because they are not come in contact with the product in the pipe.
Lap Joint Flange with a Stub End
Stub Ends are available in almost all pipe diameters. Dimensions and dimensional tolerances are defined in the ASME B.16.9 standard. Light-weight corrosion resistant Stub Ends (fittings) are defined in MSS SP43.
Stub Ends are available in almost all pipe diameters. Dimensions and dimensional tolerances are defined in the ASME B.16.9 standard. Light-weight corrosion resistant Stub Ends (fittings) are defined in MSS SP43.
Threaded flange
Threaded Flanges are used for special circumstances with their main advantage being that they can be attached to the pipe without welding. Sometimes a seal weld is also used in conjunction with the threaded connection.Although still available in most sizes and pressure ratings, screwed fittings today are used almost exclusively in smaller pipe sizes.
A threaded flange or fitting is not suitable for a pipe system with thin wall thickness, because cutting thread on a pipe is not possible. Thus, thicker wall thickness must be chosen...what is thicker ?
ASME B31.3 Piping Guide says:
Where steel pipe is threaded and used for steam service above 250 psi or for water service above 100 psi with water temperatures above 220° F, the pipe shall be seamless and have a thickness at least equal to schedule 80 of ASME B36.10.
Details of Threaded flange
1. Threaded flange 2. Thread 3. Pipe or Fitting
1. Threaded flange 2. Thread 3. Pipe or Fitting
Blind flanges
Blind Flanges are manufactured without a bore and used to blank off the ends of piping, Valves and pressure vessel openings.From the standpoint of internal pressure and bolt loading, blind flanges, particularly in the larger sizes, are the most highly stressed flange types.
However, most of these stresses are bending types near the center, and since there is no standard inside diameter, these flanges are suitable for higher pressure temperature applications.
Details of Blind flange
A blind flange is a solid disk used to block off a pipeline or to create a stop.
1. Blind flange 2. Stud Bolt 3. Gasket 4. Other flange
A blind flange is a solid disk used to block off a pipeline or to create a stop.
1. Blind flange 2. Stud Bolt 3. Gasket 4. Other flange
Flanges specification, Standard and identification
Below you will find a short description and definition of each type, completed with an detailed image.
- Most common flange types
- What is a Flange?
- What is the use of a blind flange?
- 5 Different Types of ANSI Flanges
- The 6 Common Types of Flanges
- Pressure Classes of Flanges
- Applications of flanges
- Uses of Weld Neck Flanges
- Facing according to EN 1092-1
- The main elements of the flange
- Forged flange and sealing face...
- Flanges Used in Piping Systems
- Types of ASME/ANSI flanges
- Flanges Manufacturing Process
- Forged flange process
- Flange Face Surface Finish
- Types of Pipeline Flange Faces
- Measure the size of a flange
- Packing Works for Steel Flanges
- Flanges Raw Material
- Flange materials acc. to ASTM
- General flange standards
- Flange Connections
- Abbreviations of flange
