Procedure to monitor and/or check a pressure device having an interior channel surrounded by a wall, particularly a metal wall - particularly comprising a pipe and/or a tank and/or a boiler - particularly a device designed to conduct and/or maintain a fluid - particularly a gas, a liquid or a flowing dispersion - particularly acting nominally on the wall with a static pressure greater than 1 bar in said interior channel, wherein said procedure comprises the following steps: - Measurement of an elongation of the wall, which depends on a static internal pressure present in the interior channel, and particularly varies over time, for the purpose of determining an elongation value (X ε1 ) that represents said elongation of the wall; - Measurement of a static internal pressure present in the interior channel, for the purpose of determining a pressure measured value (X p ) that represents said static internal pressure; - and use of the elongation value (X ε1 ) and the pressure measured value (X p ) to determine damage to the wall (Δw), in such a way that -- the pressure measured value (X p ) is used to determine a target elongation value (X ε1_SOLL ) that represents a nominal elongation of the wall, -- the elongation value (X ε1 ) and the target elongation value (X ε1_SOLL ) are used to determine an elongation deviation value (X Δε ) that represents a discrepancy between the elongation of the wall and the nominal elongation, -- and that the elongation deviation value (X Δε ) is used to determine the damage to the wall, particularly to determine a damage value (Err Δw ). - Measurement of an elongation of the wall, which depends on a static internal pressure present in the interior channel, and particularly varies over time, for the purpose of determining an elongation value (X ε1 ) that represents said elongation of the wall; - Measurement of a static internal pressure present in the interior channel, for the purpose of determining a pressure measured value (X p ) that represents said static internal pressure; - and use of the elongation value (X ε1 ) and the pressure measured value (X p ) to determine damage to the wall (Δw), in such a way that -- the pressure measured value (X p ) is used to determine a target elongation value (X ε1_SOLL ) that represents a nominal elongation of the wall, -- the elongation value (X ε1 ) and the target elongation value (X ε1_SOLL ) are used to determine an elongation deviation value (X Δε ) that represents a discrepancy between the elongation of the wall and the nominal elongation, -- and that the elongation deviation value (X Δε ) is used to determine the damage to the wall, particularly to determine a damage value (Err Δw ). -- the pressure measured value (X p ) is used to determine a target elongation value (X ε1_SOLL ) that represents a nominal elongation of the wall, -- the elongation value (X ε1 ) and the target elongation value (X ε1_SOLL ) are used to determine an elongation deviation value (X Δε ) that represents a discrepancy between the elongation of the wall and the nominal elongation, -- and that the elongation deviation value (X Δε ) is used to determine the damage to the wall, particularly to determine a damage value (Err Δw ). <EOS>