The device is for grinding a pipe from an inside. The device has a spindle arranged to be rotated. The device further has protrusions fastened to the spindle. The protrusions have a strip causing an elastic force when being bent. The protrusions are arranged to position the device or a part of the device inside the pipe. The protrusions have blades arranged to grind the inner surface of the pipe, while the spindle is being rotated.

A device used for cutting a pipe from an inside. The device has a spindle arranged to be rotated. The device further has protrusions fastened to the spindle and arranged to position the device or a part of the device inside the pipe. The protrusions have at least one blade arranged to machine material off the inner surface of the pipe to cut the pipe while the spindle is being rotated.

An apparatus for removing O-rings from a device is disclosed. The apparatus includes a first actuator assembly that is adapted to modulate at least two first cutting members via at least two pistons. The apparatus includes a second actuator assembly that is adapted to modulate at least two second cutting member via at least two pistons. The apparatus further includes a receiver module sandwiched between the first actuator assembly and the second actuator assembly. The receiver module is adapted to secure the device to remove the O-rings. The receiver module is adapted to be replaced according to a model of the device. The at least two first cutting members and the at least two second cutting members operate in a complementary manner and in synchronization with each other to perform at least two hitting strokes per cycle for an efficient breakage of the O-rings.

A borehole is bored to a borehole target depth in a site and a geothermal heat exchanger is inserted into and then secured in the borehole at the desired depth. Once the heat exchanger has been secured in the borehole, the heat exchanger has a closed distal end and an open proximal end and has at least one fluid path between the closed distal end and the open proximal end, with installation fluid disposed in the fluid path(s). After securing the heat exchanger in the borehole and before excavation of a portion of the site immediately surrounding the borehole, the heat exchanger is temporarily sealed by installing, through the open proximal end, at least one respective internal seal in each fluid path. For each fluid path, the internal seal(s) will be disposed below a respective notional subgrade depth and excavation of the site immediately surrounding the borehole can proceed.

Various examples are provided related to untethered internal grooving. In one example, a method includes inserting a cutting tool into a tubular workpiece; aligning a driving magnet on an outer surface of the tubular workpiece, the driving magnet including poles aligned with poles of magnets of the cutting tool to position a cutter of the cutting tool against an inner surface of the tubular workpiece; and forming a groove on the inner surface of the tubular workpiece by controlling rotation of the workpiece and linear movement of the cutting tool. The cutting tool can include magnets each including poles on opposite sides and a cutter secured between the magnets.