Flange Types

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.

Packing the pipe flange

• 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

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.

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.

Flanges process

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.

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

TYPES OF FLANGES

The most used flange types in Petro and chemical industry are:

• Welding Neck Flanges
• Slip-On Flanges
• Socket Welding Flanges
• Lap Joint Flanges
• Threaded Flanges
• Blind Flanges, Figure-8 Blanks

SPECIAL FLANGES

Except the most used standard flanges, there are still a number of special flanges such as:

• Orifice Flanges
• Expander Flange
• Spectacle Blind Flange
• Reducing Flange
• Weldoflange / Nipoflange

Materials for Flanges

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.

Dimensions of Flanges

Each flange according to ASME B16.5 has a number of standard dimensions. If a draftsman in Japan or a work preparer in Canada or a pipefitter in Australia is speaking about a Welding Neck flange NPS 6, Class 150, Schedule 40 ASME B16.5, then it goes over the flange which in the image here below is shown.

If the flange is ordered, the supplier want to know the material quality. For example ASTM A105 is a forged carbon steel flange, while A182 is a forged stainless steel 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