Abrasive entrainment waterjet technology to cut objects located above or below ground. Abrasive is conducted to an entrainment abrasive waterjet cutting head under the control of an abrasive feed and metering system that monitors the flow rate of abrasive.

The use of abrasive entrainment waterjet technology to cut objects located at the bottom of a body of water. Abrasive is conducted to an abrasive waterjet cutting head under the control of an abrasive feed and metering system that monitors the differential pressure between the cutting head and reservoir of abrasive material and maintains the pressure at the abrasive reservoir greater than the pressure hydrostatic pressure at the cutting head.

Abrasive entrainment waterjet technology to cut objects located above or below ground or above the surface of a body of water. Abrasive is conducted to an abrasive waterjet cutting head under the control of an abrasive feed and metering system that monitors the flow rate of abrasive.

Abrasive entrainment waterjet technology to cut objects located above or below ground. Abrasive is conducted to an entrainment abrasive waterjet cutting head under the control of an abrasive feed and metering system that monitors the flow rate of abrasive.

A waterjet system in accordance with a particular embodiment includes a pressurizing device configured to pressurize a fluid, a cutting head downstream from the pressurizing device, and a catcher positioned to collect a jet from the cutting head. The system can further include a treatment assembly configured to treat a feed fluid to the pressurizing device and/or a byproduct fluid from the catcher, such as by removing submicron colloidal particles from the feed fluid and/or from the byproduct fluid. For example, the treatment assembly can include a coagulation unit, such as a chemical coagulation unit or an electrocoagulation unit, configured to coagulate the submicron colloidal particles. The pressurizing device, the cutting head, and the treatment assembly can be at different respective portions of a fluid-recycling loop.

A blasting system, comprising a tank, a center tube, an inlet, a top aperture. Said tank holds a slurry mixture for blasting application. Said inlet receives a pressurized air. Said center tube receives a portion of said pressurized air and selectively receives a portion of said slurry mixture. A portion of said center tube exits said tank at said top aperture. Said tank comprises a top end and a bottom end. Said relief valve regulates fluid capacity in said tank and relives pressure from said tank