Our Products

Butt Weld Fittings

PetroTajhiz Kadoosan offers a range of precision finished buttweld fittings to our customers, which ensure a continuous flow in both seamless and welded pipes systems.

PetroTajhiz Kadoosan offers a range of precision finished buttweld fittings to our customers, which ensure a continuous flow in both seamless and welded pipes systems.

Long radius knees, straight tees, equal tees as well as concentric and eccentric reducers are all available in a number of different sizes to match our clients’ requirements.

Pipe fittings such as buttweld fittings, threaded fittings and socket weld fitting are essential parts of pipelines as they allow for:

  • A change in direction for the liquid flowing through the pipes
  • Branching of the pipe to allow the liquid to flow in two separate directions
  • A reduction in pipe diameter
  • The attachment of auxiliary equipment
  • The end of the pipeline

All the buttweld fittings supplied by PetroTajhiz Kadoosan are designed in accordance to ASME standards. They can be sourced from specialised manufacturers in many different materials including Super Duplex, Nickel Alloy, Stainless Steel, Duplex or even 6% Moly.

SIZES1/2" - 48"

Long Radius 90º & 45º knees

Short Radius 90º & 45º knees

Long Radius 180º Returns

Short Radius 180º Returns

Straight Tees

Reducing Tees

Lateral Tees

Barred Tees

Concentric Reducers

Eccentric Reducers



Stub Ends

MATERIALS: Carbon Steel, Stainless Steel, Duplex & Super Duplex, Alloy steel

A420WPL3 - WPL6
A234WP1 - WP5 - WP9 - WP11 - WP22 - WP91
A403WP304 (L/H) - WP316 (L/H/TI) - WP321 (H) - WP347 (H)
A815UNS 31803 - UNS 32205 - UNS 32750 - UNS 32760
A860WPHY42 - WPHY46 - WPHY52 - WPHY56 - WPHY60 - WPHY65
MSS-SP75WPHY 42-46-52-60-65-70

Manufacturing of Buttweld Fittings

A buttweld fitting is manufactured by the process of hot or cold forming, which means that it is bended and molded to the correct shape. They are also heat treated to remove residual stresses and to achieve specific mechanical properties.

The ends of buttweld fittings have to be bevelled and the exact shape of the bevel depends upon the wall thickness of the pipe it is being attached to. Material of a buttweld fitting can be any one of a number of exotic materials such as super duplex, nickel alloy or 6% Moly. The majority of the time, the material of the fitting is the same as the pipe system that it is welded to.

Buttweld fittings are defined in the ASME B16.9 standards, with light-weight corrosion resistant fittings made to MSS SP43 specifications.

These fittings are regularly used in piping systems and are available in many different shapes, that are dependent on the intended purpose of the fitting:

  • ‘knees’ are used to alter the pathway of a pipeline
  • ‘Reducers’ are needed to reduce or increase the size of the pipe bore size
  • ‘Tees’ or ‘Crosses’ are used to split the flow in the pipe multiple ways
  • ‘Caps’ are used if the pipeline needs to be closed off

Buttweld fittings can be finished in a variety of ways depending on the application is it required for. Similarly, for added corrosion protection, different coatings can be used such as galvanising, aluminising and claddings.

Once manufactured, buttweld fittings can be tested to ensure they confirm with specific standards, so they are able to perform as required in their intended application. Both destructive and non-destructive testing can be carried out to ensure the end-user is satisfied in the quality of the fitting.

Applications of Buttweld Fittings

Buttweld fittings can be used in a wide variety of industries to alter, divide or end the flow of fluids. These operations include the following:

  • Waste treatment facilities
  • Chemical processing
  • Breweries
  • Petrochemical facilities
  • Cryogenic plants
  • Paper production
  • Gas processing
  • Nuclear power plants

The wide range of applications demonstrates the robustness of a buttweld fitting and how much this particular type of fitting is relied upon.

Advantages of Buttweld Fittings

Buttweld fittings can withstand pressures and temperatures in very harsh environments. They are generally considered to be the most robust welding fixture, no matter what industry is using them. However, they do take a considerable time to fit and a highly skilled installer is needed who can weld them correctly on site.

  • Welded connection offers a more robust, a stronger and a more leak-proof piping connection.
  • The nature of the continuous metal structure provides added strength to the overall piping system.
  • The smooth inner surface and gradual directional changes provide a seamless flow, thus minimising pressure drops and turbulence inside the pipe.
  • Provide the option of various different turn radiuses due to the manufacture of Short Radius fittings, Long Radius fittings and 3R knees.
  • Cost effective compared to the counterpart fittings in the threaded or socket weld varieties.
  • They have a long service life and are cost effective to purchase and deploy.
  • Buttweld fittings can withstand corrosion and erosion more effectively than its socket weld and threaded equivalents.
  • A welded system uses comparatively less space that the other alternatives.

Quality control

All the buttweld fittings that PetroTajhiz Kadoosan sources and supply meet the requirements of the oil, petrochemical, water treatment and other allied industries.

PetroTajhiz Kadoosan Butt Weld Fittings have been fully tested to international standards to ensure we only supply the highest quality products.

Here is a full list of the buttweld fittings that we stock, in a range different material

  • Super Duplex (both S32760 and S32750 / 2507)
  • Duplex (S31803 / 2205)
  • 6% Moly (S31254)
  • Nickel Alloys (Alloy 400, 625, 800, 825, etc)
  • Stainless Steels (316L, 304L, 904L, 310, 321, etc)

PetroTajhiz Kadoosan buttweld fittings can be manufactured both seamless and welded with 100% X-ray depending on the size. Everything we supply is manufactured in accordance with the American Society for Testing & Materials (ASTM) Standards) as follows:

  • ASTM A403
  • ASTM A815
  • ASTM B366

The dimensional standard of the buttweld fittings we supply are in accordance with the American National Standards Institute (ANSI):

  • ANSI B16.9
  • MSS SP43
  • MSS SP75

In stock we have the following sizes and wall thicknesses available:

  • Seamless buttweld fittings: ½” to 8” in wall thicknesses from SCH10S to SCHXXs
  • Welded buttweld fittings: 6” to 24” in wall thicknesses of SCH10S, SCHSTD and SCHXS

We can also source and supply any size and wall thickness required by our clients, as well as specialised fittings to fit within specific drawings.

PetroTajhiz Kadoosan and Buttweld Fittings

Here at PetroTajhiz Kadoosan, we have worked with a highly regarded network of specialist mills and manufacturers for many years to source a wide range of high quality and reliable buttweld fittings. We have a variety of different fixtures available in different sizes and materials in stock. We can also source items to meet one-off requirements and fit with specific drawings.

All our products are fully tested to international standards. You can be safe in the knowledge that you are buying high quality products. Speak to our sales team today in one of our offices across the globe.