Abstract: Method for installing a cable into a duct, comprising the steps of: determining a maximum pressure, setting a leaking mode of a leaking plug to start at a leaking pressure drop equal to or lower than the maximum pressure, attaching the leaking plug to a foremost end of the cable, introducing the foremost end of the cable into the duct, supplying a pressurized liquid into the duct: at a supply port, and at a supply pressure, so that the cable is pulled by the leaking plug, before the foremost end has reached the second extremity, exceeding the leaking pressure drop at a location close to the leaking plug.

Abstract: Method for installing a cable comprising: a first phase with at least the steps of: introducing the cable into a first duct, attaching at least a first pig to the cable, introducing a liquid at first pressure and first flow into the first duct, stopping the cable when, or after, its foremost end has reached an exit of the first duct, a second phase with at least the steps of: attaching at least a second pig to the cable, introducing again a liquid at first pressure and first flow into the first duct, introducing the liquid at second pressure and second flow, compensating, at a location between the first duct and second duct, for a difference in flow or volume of liquid.

Abstract: A method for installing an elongated element into a duct by pushing the elongated element into the duct through a pressure chamber, introducing pressurized fluid into the duct at a nominal pressure, and applying a driving force. The method including monitoring fluid pressure into the duct and the driving force and reducing the fluid pressure to a predetermined value lower than the nominal pressure.

Abstract: A method for operating an elongated element through a full length of a bended duct being bended over a major part of its length, the method comprising the steps consisting in: introducing a liquid into the bended duct and maintaining predetermined flow and pressure conditions of the liquid into the bended duct, compensating a friction between the bended duct and an end of the elongated element being bended by the bended duct, by locally applying a predetermined axial effort to the end of the elongated element.

Abstract: A duct rod system to be pushed in a conduit of a defined configuration for installing an elongated element in the conduit and comprising at least one rod having a flexible main body, the flexible main body having a bending stiffness arrangement defined in relation to the defined configuration of the conduit to permit a friction reduction of the flexible main body in the conduit.

Abstract: A method for laying an elongated element in a duct using a fluid injected under pressure through a fluid inlet in a pressure housing disposed at the elongated element inlet extremity of the duct. A mechanical drive placed before the pressure housing and the duct pushes the elongated element into the pressure housing and the duct. The method includes installing a first front end pulling pig at the front end of the elongated element and installing at least one subsequent pulling pig around the elongated element. The distance between each pulling pig is mainly constant. The method also includes applying the same maximum pressure drop to each pulling pig. The total pressure of the fluid injected being mainly equally shared by all the pulling pigs.

Abstract: A duct rod system to be pushed in a conduit of a defined configuration for installing an elongated element in the conduit and comprising at least one rod having a flexible main body, the flexible main body having a bending stiffness arrangement defined in relation to the defined configuration of the conduit to permit a friction reduction of the flexible main body in the conduit.

Abstract: An apparatus retracts, stores, and inserts an elongated element. The apparatus has a retracting unit for retracting a length of a pre-cut module through a window of a retractable cable, a storage unit for storing the retracted pre-cut module, and an inserting unit for inserting the retracted pre-cut module into a branch duct. The retracting unit, the storage unit, and the inserting unit are mounted on an assembly portion installed at a branch location.

Abstract: A method for laying an elongated element in a duct using a fluid injected under pressure through a fluid inlet in a pressure housing disposed at the elongated element inlet extremity of the duct. A mechanical drive placed before the pressure housing and the duct pushes the elongated element into the pressure housing and the duct. The method includes installing a first front end pulling pig at the front end of the elongated element and installing at least one subsequent pulling pig around the elongated element. The distance between each pulling pig is mainly constant. The method also includes applying the same maximum pressure drop to each pulling pig. The total pressure of the fluid injected being mainly equally shared by all the pulling pigs.