The Clock Spring repair system

A typical repair consists of locating and cleaning the defect area. The defect area and other voids under the repair are filled with a high compressive strength material to transfer the loads from the pipe to the externally applied composite sleeve. 

A starter pad is applied to the pipe to secure the inner edge of the composite sleeve. Adhesive is used to secure the sleeve to the pipeline. The composite sleeve is then wrapped around the pipe, typically eight layers, while applying adhesive between each layer. 

The unit is tightened onto the pipe. Excess adhesive and filler will extmde out the edge of the unit ensuring a fully filled, tight fit. The adhesive will cure in about 2 h and the repair area can be recoated and backfilled. The entire installation takes only about 30 min. 

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Figure 6.2 The Clock Spring repair system. Courtesy of Clock Spring Company L.P.

GRI-02/0165 Long-Term Lap—Shear Testing of Clock Spring High Temperature Adhesive. Report The Clock Spring repair system is used as a reinforcement for pipeUnes with corrosion defects and/or mechanical damage, 2002. 

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