Western Work Boats

Equipment

Western Work Boats

Seabed Core Sampling

SEAS Offshore: Submersible Vibrocoring Equipment

Seabed Core Sampling

Introducing…
The New SEAS VC-450 Vibro Corer

  • 6m x 75mm Core Barrels
  • Operates in up to 200m of water depth
  • Diverless Operation
  • Normal Minimum Production of 10 Cores per day easily achived

NOW AVAILABLE IN NEW ZEALAND

Geotechnical Offshore Seabed Tools

GOST as used in the straight rod mode GOST is an innovative geotechnical tool to characterize the subsoil by means of ‘push-in tolls’, i.e. cone penetration testing along with pore pressure measurements, known was CPTu.

The primary focus of GOST is offshore site investigation but due to its modular layout, the system also works onshore, for instance mounted on a truck. Thus, GOST can be operated from almost any platform which can handle around 9 tons of weight.

GOST is mainly designed to operate from the seafloor. It is powered and controlled via a standard single wire coaxial cable. During continuous offshore surveys, the tool is only slightly lifted from the seafloor and hanging within the water column during site-transit – called “dangling operation”. GOST stays under water without the need of full recovery until all sites are penetrated. This leads to a large number of tests in considerable less valuable vessel time than any other top-presses CPT toll would be capable of.

GOST can handle straight and coiled rod setups of many diameters. So far, we use a ‘digital subtraction cone’ of 5 cm2 in conjunction with a differential pore pressure system on a rod of 2 cm in diameter.

Fields of Application:

  • Site Investigation on-/offshore
  • Foundation Investigation
  • Cable Route / Pipeline Surveys
  • Environmental Mapping
 Seafloor based site investigation allows fast profiling and mapping, “dangling operation”
GOST as used in coiled-rod mode
  • On- & offshore use, 4000 m depth rating
  • Modular depth of penetration:
    • Coiled Rod: up to 15 m
    • Straight Rod: length limited by soil stiffness, 6-15 m
  • Adjustable penetration pressure 0-70 kN = 7.9 to
  • Dual range bridge for force measurements @ tip & sleeve
  • Exact control on push velocity data compatible to highest international standards, e.g. DIN 4094
  • Video control during deployment & push-in (projected)
  • Short mobilization times, own mobile winch (0-500 m)
  • Modular replacements: tips & rods are separate
  • “Open” system to adapt additional sensors and probes

Cone Parameters

Standard

  • Cone Resistance
  • Sleeve Friction
  • Diff. Pore-Pressure
  • Cone Inclination
  • Temperature
 Optional (Projected)

  • Heat Flow
  • Magnetic Susceptibility
  • Soil and Water Sampling
 General Contact

Prof. Dr. Tobias Moerz

University Bremen, MARUM
Room 2210
Leobenerstr.
D-28359 Bremen
Phone: +49 (0) 421 218-65 840
Fax: +49 (0) 421 218-65 810
Mobile: +49 (0) 171-30 34 154
Email: tmoerz@uni-bremen.de

 Technical Contact

Dipl. -Ing (FH) Wolfgang Schunn

University Bremen, MARUM
Room 2210
Leobenerstr.
D-28359 Bremen
Phone: +49 (0) 421 218-65 842
Fax: +49 (0) 421 218-65 810
Email: wschunn@uni-bremen.de

A variety of push-in sensors can be adapted to meet the needs of your interest!

Technical Details

GOST Technical Details

Global Accoustic Positioning System (GAPS)

Portable, Calibration-Free USBL

The calibration-free Global Accoustic Positioning System (GAPS) combines USBL, INS and GPS technologies. The most accurate USBL in its category, it works in deep or extremely shallow water where other systems have failed.

Features

  • Calibration-free
  • 4,000m range, accuracy 0.2% of the slant range*, 200 deg coverage
  • All-in-one system, simple to use
  • Provides absolute position as well as surface GPS – robust position

    • *Performance depends on environment/noise conditions

 Benefits

  • No mobilization/demobilization: fully operational in less than 1 hour
  • Adapted to all applications: shallow and deep water, and noisy environments
  • Easily transferable from one vessel to another
  • Robust to accoustic and GPS hazards

Applications: Towfish Tracking – AUV, ROV and any subsea vehicle – Diver Tracking

GAPS Technical Details

Please click on the image below to make it larger.
GAPS Technical Specifications

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