Fabrication and Welding

Denholm Zholdas have a state of the art fabrication facility based near the Tengiz field in western Kazakhstan. Denholm Zholdas provide high quality service to the petrochemical industry in Kazakhstan and specialise in the following areas:

  • Pipework systems including high pressure flow lines
  • Installation of structural steelwork
  • Installation vessels, tanks and related equipment packages


  • Fabrication and installation of piping system components, carbon, exotic steels
  • Fabrication and installation of structural steelwork components
  • Surface preparation and coating application of constructed steelwork
  • Dimensional control and laser surveys
  • Pressure testing of fabricated materials
  • Inspection of fabricated materials

Denholm Zholdas have a bespoke fabrication facility in Tengiz, designed with the harsh climate conditions in Kazakhstan in mind and fully acclimatised to facilitate a true year round service. The shop layout design ensures a seamless progression of work through the facility to the dispatch point.The equipment within each individual bay enables Denholm Zholdas to achieve high productivity rates without compromising quality.

The facility comprises the following features.

  • Fully separate carbon shop 60 metres by 18 metres
  • Isolated clean shop for stainless and exotic materials 40 metres by 18 metres
  • Isolated coatings area with fume extraction
  • Each shop has its own individual overhead craneage up to 10 tonnes
  • Each individual work station boasts its own 2 ton jib crane and welding positioning equipment
  • Integral NDE area
  • Pressure testing bay
  • Blasting facility with fume extraction and grit recovery

Our fabrication facilities cover a range of techniques including but not limited to:

  • Manual metal arc
  • Tungsten inert gas
  • Gas shielded metal arc
  • Pulse GMAW
  • RMD specialist process
  • Sub-arc welding (high deposition)

Our approved welding procedures cover a variety of welding and material configurations, combined processes, dissimilar and exotic material applications.

Our welding operations are carried out in accordance with independently approved Weld Procedure Specifications (WPS) and Weld Procedure Qualification Records (WPQR), and cover a range of materials from conventional carbon steel tube, plate and sections through to stainless and exotic steel materials.

In order to maintain the highest of quality standards Denholm Zholdas operate the TWI developed Welding Quality Control Package.


Denholm Zholdas

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