Pile and borehole airlift dredging


The customer required a means to dredge the base of subsea boreholes down to 50m below seabed level. There was also a requirement to clean sacrificial borehole casings from marine growth.


Ashtead Technology developed a bespoke air lift dredge string for borehole dredging. The tool has a 10” displacement for soil removal and incorporates high pressure jetting ports to break up heavy soil. The tool is fitted with sensors to monitor its depth and position within the pile.

Benefits and value

  • In-house solution design using Ashtead Technology’s extensive knowledge of offshore tooling operation and function
  • Fully integrated service delivery from concept through to offshore mobilisation and operation
  • Efficient purpose built tools ensuring reliability and performance
  • Fully instrumented tools enabling real time operation tool control and QC of dredging/ cleaning operations