Casing (Soft Sediment Coring)
Casing pipe facilitates direct-push coring by limiting drive rod flex in deep water, and provides a conduit to the borehole for re-entry in repeat-drive coring. If needed, casing can be advanced after each coring drive to minimize coring friction and to stabilize the borehole.
Images show 4-inch diameter aluminum pipe with circle-lock connectors. Large diameter, thick-wall (Schedule 40) PVC pipe can also be used, with glue-on threaded connectors.