A method for updating a pipe network plan, in particular district heating network plan, that is a plan in which the network leading from a fluid with a thermal insulation surrounding and recorded with at least one a measurement path forming sensor wire tubes provided, one above the sensor wire has a leak in the tube by means of measuring the resistance of the sensor wire to the pipe, the voltage ratios, or by measuring the transit time of a discontinued to the sensor wire and reflected from a damage site pulse can be determined, characterized by the steps of: providing a defined resistance of the sensor wire to the pipe-reducing switch to an on actuation Location of the measurement path, operating the switch at regular intervals, measuring the resistance or the voltage conditions and / or measuring the duration of a discontinued pulse to the sensor wire at the switch is actuated, determining a an Tol eranzschwelle exceeding change in resistance value or the period between successive measurements, determining the cause of the detected change, based on an error eliminating a cause of the change, and updating the pipe network plan under an indicia can not be overcome cause.
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