A cutting head assembly uses multiple cutting heads directing ultra-high pressure fluid in different directions towards an inner surface of a pipe to be cut in order to complete a full cut of the pipe while rotating or revolving the multiple cutting heads less than 360 degrees relative to central axis. The ultra-high pressure fluid mixes with abrasive inside fittings on or near each of the nozzles to further assist with cutting through the pipe. Some cutting head assemblies have two nozzles, while other cutting head assemblies have three or four nozzles.

A system (10) for moving a fluid (12) includes a flow-circuit element (30) and a control system (32) that monitors an operational condition of the flow-circuit element (30). The control system (32) includes a first sensor (82) that monitors a first sensed condition, and a second sensor (84) that monitors a second sensed condition that is different from the first sensed condition. Further, the control system (32) includes a processor (76) that analyzes the first sensed condition and the second sensed condition to monitor the operational condition of the flow-circuit element (30).

A system and method for abrasive solvent jet cutting including generating, with a high-pressure pump, a jet of rapidly moving liquid comprising a retrograde soluble solute dissolved in solvent; directing the jet of rapidly moving liquid through an orifice to cut a target, such that the retrograde soluble solute is configured to precipitate out of the rapidly moving liquid after transitioning through the orifice. An apparatus for abrasive solvent jet cutting including a storage vessel configured to store a retrograde soluble solute; a high-pressure solvent compartment; and a mixing tube configured to eject a jet of rapidly moving liquid through an orifice, the liquid comprising solvent from the compartment and the retrograde soluble solute from the vessel, such that the retrograde soluble solute is configured to precipitate out of the rapidly moving liquid after ejecting from the orifice.

An abrasive water-jet cutting machine, comprising pumping means, fluidly connectable to a water source, a cutting head, comprising a mixing chamber, a dispensing system of powdered abrasive material, comprising a tank, a supply tube and an actuator interposed between the tank and the supply tube, which delivers the powdered abrasive material contained in the tank into the mixing chamber, through the supply tube; wherein the cutting head mixes, in the mixing chamber, the abrasive material with the water jet forming a water-abrasive material mixture jet, and said cutting head delivers the water-abrasive material mixture jet; wherein the powdered abrasive material delivered into the mixing chamber is homogeneously dispersed in suspension in a water-based gelatinous fluid; and wherein the actuator is a peristaltic pump.

A water-abrasive suspension cutting facility (1) includes a high-pressure source (3) for providing (301) water at a high pressure, a high-pressure conduit (5) which is connected to the high-pressure source (3) and a pressure tank (11) for providing (303) an abrasive agent suspension (13) which is at a high pressure. The pressure tank (11) is fluid-connected to the high-pressure conduit (5) via a regulatable throttle (17). The throttle (17) is arranged at the entry side of the pressure tank (11) and is configured to regulate the feed flow into the pressure tank (11) from the high-pressure conduit (5) in dependence on at least one control variable.

A water-abrasive suspension cutting facility includes a pressure tank for providing (301) a water-abrasive agent suspension (13) which is under pressure, a lock chamber (21), and a refilling valve for refilling abrasive agent into the pressure tank via the lock chamber (21). The refilling valve (21) includes a valve entry (49), a valve exit (51), a valve space (71) which is arranged between the valve entry (49) and the valve exit (51), and a valve body (67) which is located in the valve space (71). The valve entry (49) is connected to the lock chamber (21) and the valve exit (51) to the pressure tank (11). The refilling valve (19) can assume a first closure position, a first open position and a second open position. In the first closure position the lock chamber (21) is fluid-separated from the pressure tank (11) and in the first as well as a second open position the lock chamber (21) is fluid-connected to the pressure tank (11).

A water-abrasive suspension cutting facility (1) includes a high-pressure source (3) for providing (301) water at a high pressure, a high-pressure conduit (5) which is connected to the high pressure source (3), a pressure tank (11) for providing (303) an abrasive agent suspension (13) which is at a high pressure, a lock chamber (21) which is designed to temporarily be at a high pressure and temporarily at a low pressure and a refilling valve (19) for refilling (311) the pressure tank (11) from the lock chamber (21). A delivery aid (45) is fluid-connected to the pressure tank (11) at the suction side in a manner such that given high pressure in the lock chamber (21), the delivery aid is cable of sucking an abrasive agent suspension out of the lock chamber (21) through the refilling valve (19) into the pressure tank (11).

A waterjet system is provided, including a pump configured to pump fluid, an electric motor configured to drive the pump; a hopper configured to store abrasive, a mixing chamber configured to mix abrasive from the hopper and the fluid from the pump to produce a slurry, where the fluid entering the mixing chamber is at a pressure between 2000 psi and 8000 psi, a cutting bed configured to receive a workpiece to be cut, and a cutting head, including an outlet nozzle, in downstream fluid communication from the mixing chamber, the cutting head configured to expel the slurry through the outlet nozzle as a high-velocity jet into the cutting bed.

A cutting head assembly uses multiple cutting heads directing ultra-high pressure fluid in different directions towards an inner surface of a pipe to be cut in order to complete a full cut of the pipe while rotating or revolving the multiple cutting heads less than 360 degrees relative to central axis. The ultra-high pressure fluid mixes with abrasive inside fittings on or near each of the nozzles to further assist with cutting through the pipe. Some cutting head assemblies have two nozzles, while other cutting head assemblies have three or four nozzles.

A water-abrasive suspension cutting facility includes a high-pressure source (3) for providing (301) water at a high pressure, a high-pressure conduit (5) which is connected to the high-pressure source (3), a pressure tank for providing (303) a water-abrasive agent suspension (13) which is at a high pressure, a lock chamber (21) which is designed to temporarily be at a high pressure and temporarily at a low pressure, and a filling valve (23) for filling (311) the lock chamber when this is at a low pressure. A pump (31) at the suction side is fluid-connected to the lock chamber in a manner capable of being shut off, in a manner such that given high pressure in the lock chamber (21) the pump is shut off from this and given low pressure in the lock chamber (21) the pump is in the position of sucking an abrasive agent suspension through the filling valve (23) into the lock chamber (21).