About pipe flange type, there are 13 types of flanges for piping and pipeline systems. See following:

  1. Weld Neck Flange
  2. Threaded Flange
  3. Spectacles Blind Flange
  4. Socket Weld Flange
  5. Slip-On Flange
  6. Blind Flange
  7. Reducing Flange
  8. Long Weld Neck Flange
  9. Lap Joint Flange
  10. API 6A Flange
  11. Swivel Ring Flange
  12. Orifice Flange
  13. Compact Flange

Weld Neck Flange

Weld Neck Flange is flanges that designed to be joined to a piping system by butt welding. This kind of flange include lots of specification,Weld neck Flange is expensive because of its long neck and cost of people for contact WN flange with pipeline or fitting, but is preferred for high stress applications. The necks, or hubs, transmits stresses to the pipeline.

Threaded Flange

Threaded Flanges (Screwed flanges) are similar to slip-on flanges in outline, but the bore is threaded, thus enabling assembly without welding. This obviously limits its application to relatively low pressure piping systems. Threaded Flanges may be welded around the joint after assembly, but this is not considered a satisfactory method of increasing the flanges’ pressure applications. Threaded flange use in low pressure condition generally.

Spectacles Blind Flange

China A182 Alloy Steel Spectacle Blind Flange: ASTM A182 F11, F22, FF Spectacle Blind Flanges, DIN 2656, DIN 2635, EN1092-1, 150LB-2500LB, 1/2-24 Inch.

Socket Weld Flange

Socket-weld flanges are typically used on smaller sizes of high pressure pipes. These flanges are attached by inserting the pipe into the socket end and applying fillet weld around the top. This allows for a smooth bore and better flow of the fluid or gas inside of the pipe.

Slip-On Flange

Slip-on flange is positioned so the inserted end of the pipe or fitting is set short of the flange face by the thickness of the pipe wall plus 1/8 of an inch, which thus allows for a fillet weld inside the SO flange equal without doing any damage to the flange face. The back or outside of the slip-on flange or SO flange is also welded with a fillet weld.

Blind Flange

Blind flange is a solid disk used to block off a pipeline or to create a stop. It is machined in the same manner as a regular flange with the mounting holes around the perimeter and the gasket sealing rings machined into the mating surface. The difference is that a blind flange has no opening to allow fluid to pass through. The blind flange can be inserted between two open flanges and used to block off the flow of liquid through a pipeline.

Reducing Flange

Reducing Flanges are suitable for changing line size, but should not be used if abrupt transition would create undesirable turbulence, as at pump connections.A reducing flange consists of a flange with one specified diameter having a bore of a different and smaller, diameter. Except for the bore and hub dimensions, the flange will have dimensions of the larger pipe size.

Orifice Flange

Orifice flanges are usually applying for metering the volumetric flow rate of liquids and gasses through a pipe. Two orifice flanges are called an orifice flange union. Each flange comes with two pipe taps for measuring the pressure drop of the flow through an orifice plate. Orifice plates do not come with the flanges and are sized based on the requirements of the process. Two jack screws are used to spread the flanges apart in order to change the orifice plate. This flange is normally available in weld neck, slip-on, and threaded flanges. Orifice flanges generally have a raised face.

Long Weld Neck Flange

Long welding neck flange, lwn flanges are similar to a standard Welding Neck flanges, but the “Neck” is considerably longer than other flanges. LWN flange is often used as a nozzle for a barrel or column. In addition, there are the type LWN Heavy Barrel (HB) and the Equal LWN Barrel (E); they have a different shape and a thicker “Wall”.

Lap Joint Flange

Lap joint flanges slide directly over the pipe and are most commonly used with stub end fittings. A pipe is usually welded to the Stub End and the Lap Joint pipe flange is free to rotate around the stub end. The benefit of this is that there will not be any issues with bolt holes alignment. Lap Joint flanges are often used for applications that require frequent dismantling for inspection.

API 6A Flange

API 6A Blind flange is a flange system from USA, which have flange type including Welding neck Flanges, blind Flange.

Swivel Ring Flange

The Swivel Ring Flange is comparable to a set of stub end and lap joint flange, with the difference that an Swivel Ring Flange is used for higher pressure and mostly in offshore / subsea applications.The swivel ring flanges adjust for bolt hole misalignment in the field via rotational adjustment of the bolt hole pattern on the flange ring relative to the spool piece.

Compact Flange

Compact flange, similar to a swivel ring flange, is a two-piece constructed flange used extensively for offshore pipelines, offshore industry applications and onshore and sub-sea applications. Its double sealing action prevents hydrocarbon releases to address health and safety issues and concerns.A compact flange offers significant weight and space savings over conventional flanges and leak-free joint integrity, and therefore is the most effective environmentally friendly piping joint available.

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