Polymers and Petrochemicals

6 decades. 6 continents. 6 million man hours. 25% of global capacity

Simon Carves is the world’s leading specialist engineering contractor for Low Density Polyethylene (LDPE), responsible for the design of 25% of the current global capacity of LDPE.

Since designing our first LDPE plant in 1965, over 70 plants worldwide have been designed and supplied by Simon Carves, including 80 streams in 40 plants for LDPE and EVA.

Our experience in the polymer industry encompasses all categories of the polymerisation processes including:

  • LDPE & Ethylene Vinyl Acetate (EVA)
  • Linear Lower Density Polyethylene (LLDPE)
  • High Density Polyethylene (HDPE)
  • Polypropylene (PP)
  • Polyvinyl Chloride (PVC)
  • Polyethylene Terephthalate (PET)

Simon Carves offers in-house technology licensing for the high pressure autoclave process. We have also worked closely with all major licensors of high pressure tubular and autoclave processes.

With unrivalled experience ranging from split-scope mutli-location specialist engineering services to turnkey EPC contracts, we endeavour to deliver cost savings and schedule acceleration while maintaining high standards of quality and safety.

Specialist areas of expertise include:

  • Hyper compressors and drivers
  • High-pressure pipework and vessel
  • Hazard and pressure relief studies
  • SIL assessment and SIF/ESD design for the high pressure process

Existing Plants
We recognise that many plant owners aim to extend the life of operating facilities, increase production capacity, expand the product slate and improve efficiency.

Simon Carves offers solutions in all these areas, including:

  • Revamp, modernisation and uprating
  • Technology retrofit - Including Emergency Vent Separators
  • Conversion from LDPE to EVA production


Simon Carves Venturi Product Cooling Device
The Simon Carves Venturi Product Cooling Device, sometimes referred to as a ‘jet pump’, uses the High Pressure Reactor product stream to draw in a cool ethylene gas stream and direct the cooled product stream into the High Pressure Separator. The amount of cool gas dawn into the polymer/gas stream controls the product cooling, and there is no external energy cost.

Benefits include:

  • Rapid quench - less low molecular weight polymer and higher efficiency operation
  • Improved product quality - potential for new higher value grades
  • Less downtime - no product cooler to de-foul
  • Potential to extend reactor length by incorporating existing product cooler pipework

Simon Carves has worked with clients to ascertain the feasibility of a venturi product cooler installation, produce the process and mechanical designs, procure the high-pressure components and provide specialist construction advice. 

Project Factsheets


EPC execution was split between ourselves and Daqing Petrochemical Company showcasing an effective approach to EPC work requiring specialist engineering. The shared used of a common PDMS 3D model was vital to the success of this working relationship.

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