Marine Research Equipment: Chain Bag Dredge, Gravity Corer & Van Veen Grab

Samples of rock, nodules, or cobbles from the seabed can provide geologists with valuable insights into the underlying strata and its properties. To efficiently and safely obtain these samples, SMI developed the Chain Bag Dredge. When this dredge is attached to a vessel, it is simply dragged across the desired seabed location, collecting large rock samples while allowing unconsolidated sediment to wash out. In addition to the Chain Bag Dredge, SMI also offers other essential tools like the Gravity Corer and Van Veen Grab for various sampling requirements. Based on customer information regarding the load strength of their vessel’s wire rope, SMI ensures that the dredge and safety wire ropes supplied have the appropriate load strength.

The Van Veen grab is a versatile tool for sampling disturbed sediment, effectively used with a rope or cable and manual control. This device comes in four different capacities, making it suitable for a variety of applications, including those utilizing a Chain Bag Dredge or a Gravity Corer. It offers a quick indication of sediment type, can be customized in size according to customer needs, and ensures straightforward operation.

The Gravity Corer is an essential tool that enables researchers to effectively sample and study sediment layers at the bottom of lakes or oceans. This powerful instrument is user-friendly and particularly well-suited for coring seafloors with varying lithological compositions, including both compact and soft cemented sediments. While methods like the Van Veen Grab or Chain Bag Dredge can complement sediment sampling, the Gravity Corer stands out for its strength and ease of use.