How to get high quality reducing flange

What is a Reducing Flange?

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. Reducing Flanges are suitable for changing line size, but should not be used if abrupt transition would create undesirable turbulence, as at pump connections.

Reducing flanges are designed for when there is a change in the pipe size. The predominate flange (dimensions) matching the larger pipe size (NPT) but having a smaller bore matching the smaller pipe size (NPT). These flanges normally come in blind, slip-on, threaded and weld neck flanges. Reducing flanges are an economical way to make transitions between pipes of different sizes, however, due to high-pressure loss, they are rarely used in piping. ASME B16.5 covers the dimensions of the reducing flanges. They are available in all pressure classes and provide a good alternative to connecting two different sizes of pipe. This type of flange should not be used if an abrupt transition would create unwanted turbulence, such as at a pump.

Draws of reducer flange:


There are several types of reducing flanges including weld-neck reducing flanges, slip-on reducing flanges and threaded reducing flanges.

Reducing Flange can be fabricated using a reducing spool with concentric or eccentric reducer & desired flange at each end OR it could be a single flange with internal reduced bore to connect different sized fittings on either sides.

How to connect reducing flange?

Type of Reducing flanges

Yaang can design and produce the reducing flange as per request , we can supply the reducing flange in various types including weld-neck reducing flange, slip on reducing flange and threaded reducing flange etc.

Except for the bore and hub dimensions, the flange will have dimensions of the larger pipe size. Reducing flanges are normally provided as one of three types:

  • Welding Neck reducing flange
  • Slip-On reducing flange
  • Threaded reducing flange

The number one feature of reducing flanges, is that they are a highly economical way to make transitions between pipes of different sizes.

reducing slip on flange - How to get high quality reducing flange
Reducing slip-on flange
reducing weld neck flange - How to get high quality reducing flange
Reducing weld neck flange
weld neck flange and reducing slip on flange - How to get high quality reducing flange
Weld neck flange and 
reducing slip-on flange
  • Weld Neck and Slip-On: Connect the flange sides that match the higher diameter of pipe and complete welding process. Repeat the welding process for the smaller size of pipe on the other side of the reducing flange. Now both sizes of pipes are connected through the reducing process. Take enough care to ensure that the inside diameters of the pipes are properly aligned with the ID of the Flange on both sides.
  • Threaded Flange: First connect any one size of pipe by threading to one side of the flange. Make sure that the pipe is inserted to reach the required depth inside the flange. Repeat the same process for the other size of the pipe.
  • In high pressure and temperature applications, welding is done on the outside of the pipe after threading to increase the strength of the joint.

Designed for use in changing diameters in a piping system. 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.

Uses of Reducing Flanges:
  • Reducing flanges are used in pipe-to-pipe connections.
  • Reducing flanges are a little easier to bolt up than non-reducing flanges.
  • They provide the most perfect solution when you need to connect different size flanges.
  • These flanges are available in all types and pressures.
  • Reducing flanges are fixed by welding, gluing or clamping flanges of equal dimensions provided with different connecting pieces.
  • They offer the simplest and least expensive method of mating two different sized flanges.
Standards, Dimensions & Weight
  • 300# Slip-On Orifice Flange
  • 300# Weld Neck Orifice Flange
  • 600# Weld Neck Orifice (raised face and RTJ ring type joint) Flange
  • 900# Weld Neck Orifice (raised face and RTJ ring type joint) Flange
  • 1500# Weld Neck Orifice (raised face and RTJ ring type joint) Flange
  • 2500# Weld Neck Orifice (raised face and RTJ ring type joint) Flange
Material:

Cabon steel: A105, A350 LF2
Stainless steel: A182 F304/F304L/F316/F316L/F321
Alloy steel: F11, F12

Size: 1/2” to 60”, DN 12mm to DN 1500mm 
Pressure class: Class 150 to Class 2,500, PN 2.5 to PN 250
Facing: RF / RTJ

Uses and advantages of Reducing Flanges:
  • Reducing Flanges provide the most perfect solution when you need to connect different sizes of flanges.
  • They offer a simple and most economical method to join two pipes of different sizes.
  • Available in various pressure classes up to #2500 class.

Source: China Reducing Flange Manufacturer – Yaang Pipe Industry (www.steeljrv.com)

(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)

If you want to have more information about the article or you want to share your opinion with us, contact us at sales@steeljrv.com
Please notice that you might be interested in the other technical articles we’ve published:
  • What are orifice flanges
  • What is a Blind Flange

  • What are reducing flanges

  • HOW TO GET HIGH QUALITY PIPE FITTINGS

  • How to get high quality bellow expansion joints

  • How to get high quality flanges
  • How to get high quality Welding Neck Flanges

  • How to get high quality Threaded Flanges

  • How to get high quality Spectacle Blind Flanges

  • How to get high quality spacer rings and spade flanges

  • How to get high quality socket welding flanges
  • How to get high quality slip on flanges

  • How to get high quality ring type joint flanges

  • How to get high quality plate flanges

  • How to get high quality lap joint flanges

  • How to get high quality orifice flanges
  • How to get high quality blind flanges

  • How to get high quality Threaded Flanges

  • How to get high quality Spectacle Blind Flanges

  • How to get high quality spacer rings and spade flanges

  • How to get high quality alloy flanges

  • HOW TO GET HIGH QUALITY EXPANDER FLANGES

  • HOW TO GET HIGH QUALITY LONG WELD NECK FLANGES

  • How to get high quality Weldoflange or Nipoflange

References:

  • https://www.yaang.com

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