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Moulded Buttwelding Fittings

About Rendifield moulded buttwelding fittings

Buttwelding is a very economical and reliable jointing technique for making permanently welded joints, requiring only buttwelding equipment.

Buttwelding is particularly suitable for prefabricating pipe sections and special fittings. Both Akatherm fittings with short spigot end and fittings with long spigot end are suitable for buttwelding.

Only pipes and fitting from the same wall thickness series can be butt-welded together.

Moulded buttwelding fittings physical properties

A buttweld fitting is manufactured by the process of hot or cold forming, which means that it is bended and moulded 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. The 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 valuable fittings are available in many different shapes, dependent on the intended purpose:

  • – ‘Elbows’ 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
Moulded buttwelding fittings applications

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 and even 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.

Moulded buttwelding fittings advantages

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 it is required for. However, they do take a considerable time to fit and a highly skilled installer is required to weld them correctly on site.

  • – Welded connection offers a more robust, a stronger and a more leak-proof piping connections.
  • – 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 Elbows.
  • – They are 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.

Moulded buttweld fittings specifications

Moulded buttwelding stub flanges short


Moulded buttwelding Tees 90 degrees


Moulded buttwelding reducing tees


Moulded buttwelding elbows

Moulded buttwelding concentric reducers