GRI Wrap

GRIWrap(TM) is a computer software platform developed for the natural gas pipeline industry to determine the depth and axial length of damaged regions of transmission line pipe that can be effectively and reliably repaired with external reinforcements.

The program was developed specifically to quantitatively analyze repairs of corrosion loss and mechanical defects using the Clock Spring® composite repair system. It has the capability of determining the in-service hoop stress in the line pipe and composite overwrap based on the defect geometry, pipe size and steel, and composite mechanical properties.

Long-term properties of the composite for input into the model were determined by stress-rupture tests of the composite and its adhesive under worst case, simulated pipeline conditions. Short-term performance of repairs was also verified by instrumented full-scale pipe tests designed to fail in the reinforced area. These studies, and knowledge of the stress-strain behavior of the pipe and composite, were incorporated into the thin shell program.

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    STANDARD GRIWrap

    METRIC GRIWrap