Hyperbaric Tunneling Support

Providing compressed air workers and related equipment for many of the largest and most complex tunnel projects around the world. Our experienced tunnel group is on hand to support projects from the earliest stages of concept design, proposal stages as well as emergency support services.

Our specialists can assist you in keeping costs down in addition to facilitating regulatory interaction.

Highlighted Tunnel Support Services Include:

Consultation & Site Assessments

Drafinsub offers on-site inspections of your facilities to ensure compliance with applicable local and federal regulations as they apply. This will include developing variances for equipment, saturation storage depths, decompression tables and emergency protocols.

  • Formulating project hyperbaric manual (sir, mixed gas or saturation mode)
  • Obtaining variances for alternate tables
  • Mixed gas and saturation intervention work
  • Data analyses
  • Client liaison
  • Occupational health and safety implementation
  • Consultation on airlock system design
  • Audit/appraisal
  • Environmental controls
  • Training of contractor personnel
  • Hazard / health and safety analysis
  • TBM intervention
  • Working at altitude
  • Construction in compressed air
  • Emergency and confined space rescue

Compressed Air Interventions

Drafinsub provides inspection, maintenance and repair in compressed air environments.

Interventions Include:

  • Compressed air workers
  • Manlock attendants
  • Certified welders
  • Intervention supervisors
  • Hyperbaric medics
  • Mixed gas workers
  • Intervention projects managers
  • Medical lock attendants
  • Physicians/physicians’ assistants
  • Mixed gas supervisors
  • Saturation technicians / workers
  • Hyperbaric shuttle attendants
  • Life support technicians for saturation operations
  • Saturation supervisors

Wet (Slurry) Diving Interventions

Drafinsub employs the world’s most experienced commercial divers to perform wet, slurry and Bentonite diving operations.

Underwater Hyperbaric Support Services:

  • Special Bentonite dive tables
  • Jack pack / block out entry and clean-out
  • Installation of rods into lenton fittings (zero visibility)
  • Dredging / air lifting
  • Tying underwater rebar, install rebar mats for tremie plug
  • Installation of water stop injection tubing around perimeter of shaft prior to installation of tremie plug
  • Underwater video inspection of flooded shafts and tunnels
  • Sonar inspection of flooded shafts and tunnels
  • Pressure grouting, concrete placement
  • Concrete demolition
  • Erection of structural steel
  • Drilling and blasting overburden

Medical Support

Our Hyperbaric Division employs works closely with experienced supervisory personnel in addition to a full complement of qualified Compressed Air Workers, Hyperbaric Physicians, Hyperbaric Nurses, Dive Medical Technicians, and a wide variety of other specialty personnel.