Gravity & Piston Corers
CMS-Geotech operates and hires 3m, 5m, and 8 metre barrel gravity corers. This method of sampling provides 86mm core samples from coastal to full oceanic water depths, dependant on vessel specifications and deployment systems.
The gravity corer is deployed using a freefall winch with either steel or fibre rope (deep water) and penetrates the seabed by gravity generated by allowing the corer to free-fall from a manually set height above the seabed.Our gravity corers are constructed from carbon steel but we can provide stainless steel if necessary .
The piston corer has a trip mechanism that allows the corer to drop from a set height avoiding the need for a winch with a de-clutchable break. Most importantly the pre-set drop height and use a piston significantly improves sample quality particularly in soft soil. The piston provides negative suction within the core liner aiding recovery of the sample.
Our piston corers are constructed from carbon steel but we can provide stainless steel if necessary. All systems have easily configurable weights allowing accurate penetration control (40-500kg) and penetration indicator, as standard.
The corers can easily be deployed from A-frame or crane on board and are modular to allow easy transport around the globe as a stand alone system. CMS can provide as an option a core chute to ensure ‘safe’ recovery of the corers. This is easily mobilised to most vessels