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Sediment Coring Systems

Gravity & Piston Corers, Universal Design

Mooring Systems, Inc. manufactures a sediment coring system configurable for gravity or piston coring operations.

Universal corer main body

Above: Universal corer main body

A universal design allows for multiple configuration options. The system can be adjusted for a variable number of core barrels and ballast weights to suit core sample length requirements.

The corer main body is constructed of steel and shaped like a dart with welded fins for vertical stability control during free fall.

The main body accepts up to (6) 20 kg lead discs, or up to (12) 25 kg lead discs.

Clear core liner tubes made of "cellulose acetate butyrate" plastic slide inside the steel coring barrels to retain the sample or be re-used.

A core catcher made of stainless steel fingers welded to a ring keep the sample from falling out of the liner during recovery of the corer.

A threaded bronze nose cone provides the cutting edge into the sediment.

Gravity Coring:

For gravity coring operations, the end of the deployment cable is attached to the top of the main body and lowered as fast as possible when approaching the bottom to allow gravity and inertia to drive the corer barrel into the sediment.

Gravity sediment coring valve

Above: Gravity sediment coring valve

A check valve P/N 2171VR is installed into the top end of the corer main body that simply allows water to flow through the liner during descent and blocks water during assent. This keeps the water from flushing out the collected sample.

Gravity sediment corer

Above: Gravity sediment corer

  1. Gravity Coring Configuration:
  2. Attachment Bail
  3. Stabilizing Fins
  4. One-way Valve
  5. Clamp
  6. Lead Ballast
  7. Steel Coupler
  8. Clear Plastic Liner
  9. Steel Barrel
  10. Stainless Core Catcher
  11. Bronze Nose Cone
  12. Extension Barrel
  13. Barrel Coupler

Piston Coring:

A trigger assembly is required for piston coring operations.

Piston coring system release trigger

Above: Piston coring system release trigger

The trigger system utilizes a pilot weight to allow a 5m free-fall of the corer.

Unlike the valve used in gravity coring, a piston is inserted inside the core liner and positioned at the bottom of the liner near the nose cone.

Piston sediment coring valve

Above: Piston sediment coring valve

The piston does not let water pass through it and when the corer penetrates the sediment, the piston is forced upward with the sample. This eliminates water from being trapped above the sample.

The piston is attached to the end of the deployment cable and during ascent will draw a vacuum inside the liner to help retain the sample.

Piston sediment corer

Above: Piston sediment corer

  1. Piston Coring Configuration:
  2. Attachment Bail
  3. Stabilizing Fins
  4. Clamp
  5. Lead Ballast
  6. Stainless Piston Stop
  7. Clear Plastic Liner
  8. Stainless Piston
  9. Steel Barrel
  10. Stainless Core Catcher
  11. Bronze Nose Cone
  12. Extension Barrel
  13. Barrel Coupler
Piston coring system release trigger assembly configuration

Above: Piston coring system release trigger assembly configuration

  1. Trigger Assembly Configuration:
  2. Winch Cable
  3. Bronze Wire Clamp
  4. Trigger Plate
  5. Safety Pin With Tether
  6. Pressure Activated Releases Location
  7. Lever
  8. Pilot Weight Rope
  9. Pilot Weight
Piston sediment coring system wire clamp assembly

Above: Piston sediment coring system wire clamp assembly

Piston sediment coring system wire clamp assembly

Above: Piston sediment coring system wire clamp assembly

More photos are available in the photo gallery

Component Specifications:

Corer Main BodyGalvanized Steel, 39"
Barrel SizeGalvanized Steel 3" Sch 40
Barrel LengthsCut And Threaded To Match System
Gravity Coring Weights44 lbs. (20kg)
Piston Coring Weights55 lbs. (25 kg)
Core Liner MaterialCellulose Acetate Butyrate
Core Liner Size2 5/8" ID x 2 7/8" OD
Core Liner LengthCut To Length To Match System
Nose ConeBronze
Core CatcherStainless Steel

Custom Configuration Options:

Custom configuration options PDF


Model GC-075Gravity Corer0.75m
Model GC-150Gravity Corer1.5m
Model PC-150Piston Corer1.5m
Model PC-300Piston Corer3.0m
Model PC-600Piston Corer6.0m

If you have any questions on our gravity or piston coring systems, feel free to contact us.

Universal corer main body

Above: Universal corer main body

Gravity sediment coring valve
Piston sediment coring valve

Above Left: Gravity sediment coring valve
Above Right: Piston sediment coring valve

Gravity sediment corer
Piston sediment corer

Above Left: Gravity sediment corer
Above Right: Piston sediment corer

Piston coring system release trigger

Above: Piston coring system release trigger

Piston coring system release trigger assembly configuration

Above: Piston coring system release trigger assembly configuration

Piston sediment coring system wire clamp assembly
Piston sediment coring system wire clamp assembly

Above Left: Piston sediment coring system wire clamp assembly
Above Right: Piston sediment coring system wire clamp assembly

More photos are available in the photo gallery