Deformation detection method and numerical analysis of filament-wound flexible pipe

  Objectives  This paper aims at solving the problem of pipe body failure by the local abnormal deformation of Filament-Wound Flexible Pipe (FW-FP).

  Methods  A method of monitoring the deformation of the pipe body on the basis of the principle of resistance detection is proposed. By optimizing the design of the sensor winding model, the three kinds of deformation state of the pipe body are analyzed, a reference threshold model established and a typical DN100 flexible pipe used for numerical calculation and analysis.

  Results  The current variation of circuits caused by local abnormal deformation can reach 0.25 A, but the current variation of circuits caused by normal deformation is negligible.

  Conclusions  It is proven that this method can effectively identify the local abnormal deformation of FW-FP and eliminate the signal interference caused by normal deformation. The results of this study can provide references for the follow-up service life evaluation of FW-FP.