oval polyethylene pipes (3), which consists of: a primary constriction mechanism (2), consisting of two symmetrical rotating bars (21), with lower bypass sections (22) that may be opened or closed in order to apply pressure to the pipe (3); and a secondary mechanism (4) that perforates the pipe (3) and inserts the specific bypass accessory (5) through a central bar (41) that can be moved vertically and longitudinally, incorporating a tubular connection piece (43) where a punch (8) and bypass accessory (5) are inserted.

An apparatus for temporarily blocking fluid flow through a pipe comprises a housing configured to enclose a portion of a pipe and a flow blockage device. The housing includes a first part defining a housing chamber for receiving the pipe, and a second part defining a stowage space adjacent the housing chamber. The flow blockage device is movable through an aperture formed in one side of the pipe to an installed position in the housing chamber. The flow blockage device includes an outer sealing part that is configurable between an unexpanded configuration allowing the flow blockage device to pass through the aperture and allowing fluid flow through the pipe and an expanded configuration configured to block fluid flow through pipe by substantially preventing passage of fluid between outer side surfaces of the flow blockage device and inner surfaces of the pipe.

A gripper for gripping a tube for punching may include a first arm having a lower portion and an upper portion disposed outwardly from an upper surface of the lower portion. The upper portion extends to opposite first and second side surfaces and opposite third and fourth side surfaces, where opposite edges of the first and second side surfaces each meet an edge of one of the opposite third and fourth side surfaces. The second side surface includes a groove extending from the second side surface towards the first side surface and along a length of the second side surface. The groove is configured to receive at least a portion of a tube when a second arm like the first arm is disposed adjacent to and aligned with the first arm.

An assembly and method for drilling micro holes in a tube including an outer wall having opposing open ends and forming an inner channel. The method includes the steps of submerging the tube in water so the water fills the inner channel, retaining the water in the inner channel, freezing the water in the inner channel so as to form an ice backing in the inner channel, and drilling through the outer wall such that the ice backing supports the outer wall and prevents the outer wall from deforming or distorting near the hole location.

An assembly and method for drilling micro holes in a tube including an outer wall having opposing open ends and forming an inner channel. The method includes the steps of submerging the tube in water so the water fills the inner channel, retaining the water in the inner channel, freezing the water in the inner channel so as to form an ice backing in the inner channel, and drilling through the outer wall such that the ice backing supports the outer wall and prevents the outer wall from deforming or distorting near the hole location.

An apparatus for temporarily blocking fluid flow through a pipe comprises a housing configured to enclose a portion of a pipe and a flow blockage device. The housing includes a first part defining a housing chamber for receiving the pipe, and a second part defining a stowage space adjacent the housing chamber. The flow blockage device is movable through an aperture formed in one side of the pipe to an installed position in the housing chamber. The flow blockage device includes an outer sealing part that is configurable between an unexpanded configuration allowing the flow blockage device to pass through the aperture and allowing fluid flow through the pipe and an expanded configuration configured to block fluid flow through pipe by substantially preventing passage of fluid between outer side surfaces of the flow blockage device and inner surfaces of the pipe.