There is disclosed an excavation apparatus (5), such as an underwater excavation apparatus, having means for producing, in use, at least one vortex, spiral or turbulent flow in a laminar flow of fluid, e.g. water. The excavation apparatus (5) comprises a rotor (10) having a rotor rotation axis (A), wherein, in use, flow of fluid passed or across the rotor (10) is at a first angle (α) from the axis of rotation (A). The excavation apparatus (5) comprises the rotor (10) and means or an arrangement for dampening reactive torque on the apparatus (5) caused by rotation of the rotor (10), in use. The turbulent flow is provided within, such as within a (transverse) cross-section, of the laminar flow.

Described is a deep-sea mining vehicle for taking up mineral deposits from a seabed at great depth, and optionally transporting said deposits to a floating device. The vehicle includes a support frame provided with means for moving the vehicle forward on the seabed, with at least one suction head with an open suction side which is directed toward the seabed and along which the mineral deposits and surrounding water are taken up, and with a temporary storage, connected via a suction conduit to the at least one suction head, for the mineral deposits taken up. The temporary storage includes a container with a front wall, a rear wall, side walls, an upper wall, and a bottom. The temporary storage further includes at the position of the upper wall and connecting to the front wall a first connecting part for the suction conduit, and at substantially the same height and connecting to the rear wall a second connecting part for a discharge conduit for discharge of substantially the sucked-up water. The temporary storage further includes at the position of the bottom and connecting to the interior of the container a third connecting part for a discharge conduit for discharge of substantially the mineral deposits.

Hydro excavation vacuum apparatus that process spoil material onboard the apparatus by separating water from the cut earthen material are disclosed.

A fitting for an excavating apparatus can include a cylindrical pipe that can include a first metal material. In an example, the fitting can be configured for coupling to a hose. The pipe can include an interior surface and an exterior surface. Optionally, a perimeter of the pipe does not exceed a diameter of a first end of the pipe. The fitting can include a cladding layer (e.g., a second metal material) that can be coupled to the first metal material within the interior surface of the pipe. The cladding layer can include an abrasion-resistant material. The cladding layer can be coupled to the pipe such as with a welding operation. The cladding layer can include one or more ridges. The cladding layer can corregate the interior surface of the fitting and exterior surfaces of the fitting which can come into contact with abrasive material.

The present invention relates to a system and method for uncovering and removing pipeline from the seafloor using a subsea trenching system using pressurized water to uncover pipe, a subsea shear carried by a barge to cut lengths of the pipeline, and a grapple carried by a barge to lift cut lengths of pipeline for placement on a pipe haul and recovery barge.

The hydro excavation remote dig system provides for a primary and secondary dig tube attachments that permit a vacuum truck to be used for a remote dig setup. Specifically, the attachments include various attachable handles, corrugated tubing that connects to a reinforcement bar device with releasable clamps to maintain the corrugated tubing in an elongated state during use, a debris box with an integrated safety valve, and a dig tip.

Microdredging systems comprising a pumping platform and loading platform. In certain embodiments, system operates autonomously and is adapted to allow the loading platform undock from the pumping platform for disposal of the removed sediment.

Water Reservoirs and wetlands are a major source of methane emissions contributing to greenhouse gases. The annual flood seasons contribute to movement and accumulation of sediments behind irrigation and hydropower dams. These sediments accumulate year after year, lead to loss of water storage capacity and ability to produce hydro-electricity. The invention being proposed to dredge deep sediments from reservoirs operates on the principle of using gaseous fuel from an external pipeline or collected methane emissions as fuel for a submersible internal combustion slurry system. The invention combines the features of an internal combustion liquid piston engine with a slurry turbine driving a dredging cutter. Slurry entering into the system forms a column that is set in oscillation through the explosion of air and fuel and is then pumped to shore.

Embodiments of the invention provide apparatus and method for seabed resources collection. The apparatus comprises a main module and a plurality of seabed resources collecting devices releasably attached to the main module, wherein the main module and the plurality of collecting devices are configured to be launched from a surface vessel towards a seabed; the main module includes a control module which is configured to determine a mining path for each of the collecting devices based on characteristics of the seabed, control each of the collecting devices to collect seabed resources along the determined mining path and control transfer of the seabed resources collected by the collecting devices, wherein each collecting device is configured to be released from the main module after the apparatus is launched, and to collect seabed resources along the mining path determined by the main module after being released.

The present invention relates to a system and method for uncovering and removing pipeline from the seafloor using a subsea trenching system using pressurized water to uncover pipe, a subsea shear carried by a barge to cut lengths of the pipeline, and a grapple carried by a barge to lift cut lengths of pipeline for placement on a pipe haul and recovery barge.