Additional Service Information

Committed to quality assurance in the fields of service, safety and efficiency, Crest is now able to offer the following services.

  • Specialist demolition services. 
  • Chemical and physical decontamination. 
  • Specialist pipe and fired heater decoking / descaling. 
  • Catalyst change out services 
  • Waste disposal. 
  • Ultra High Pressure water jetting and cutting. 
  • Confined space entry. 
  • Tank cleaning

Selection of Cleaning Technology

The DDT technology can be utilised to clean fired heaters and auxiliary pipe work, water harness scale from oil and gas pipelines, wax and paraffin deposition in oil pipelines, calcium carbonate and other scales from process plant effluent and supply pipelines.

In general, this technology can be utilised to remove unwanted depositions from piping and pipeline systems from 50 mm to 1,220 mm in diameter and from a few meters to hundreds of kilometres in length.

Customised Pigg® Design

The DDT Pigg® has a patented design. It is the only Pigg® available on the market which has interchangeable appendages. The Crest Engineer specifically designs each Pigg® for each stage of the cleaning operation. By using a multitude of different shapes and hardness (see above image) of cleaning appendages, the Piggs® can be adapted to the particular heater and type of deposit build-up. The engineer is also able to control the height of each appendage allowing more or less water bypass to aid the cleaning operation. 

Stud Hardness

The DDT Pigg® comes with a range of attachments that are specifically selected to suit the circumstances of individual fired heaters. The selection of the stud type and material is made based on the type of deposit and the materials of construction of the tubes.

Contaminated Area Only

Cleaning of ‘Contaminated area only’, patented bi-directional Pigg® control allows concentration of the cleaning effort in the areas which need it most, preventing wasted time that would be necessary to pass the pig from launcher to launcher.


The Crest personnel are highly qualified, skilled and experienced, ensuring the most effective cleaning of the heater. The DDT technology has over 10 years of industrial experience.

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BP Testimonial

Crest Environmental BP Testimonial Image
“We would like to commend Crest Environmental Services, for their work during the recent demolition and decontamination of Kwinana’s bulk MFAKMstorage & blending facility.” - Kathleen Lucas, Business Unit Leader - BP Refinery (Kwinana)

Shell Testimonial

Crest Environmental Shell Testimonial Image
“The operation was carried out with the utmost professionalism, with no accidents or incidents, and within the agreed time. A hazardous job well done.” Gary Smith Refinery Manager-Shell Refining (Australia)

Contact Crest Environmental Services

Innospec Manufacturing Park, Oil Sites Road, Ellesmere Port, Cheshire, CH65 4EY
+44 (0) 151 355 2786 Fax:+44 (0) 151 355 4192