Long-term Ring Bending

Long-term ring bending strength is an important parameter for the design of buried pipes. Requirements and design practice for this property are specified in the product standards. The test method consists of subjecting a series of pipe samples to constant loads in an aqueous environment and measuring the failure deflection and the time to failure. The data is then analysed and extrapolated to determine the 50-year ring bending capacity of the pipe.

In the design of FLOWTITE pipes, the combined effect of strains from internal pressure and ring bending is taken into account. Because the bending strain is directly proportional to pipe wall thickness, the high efficiency of the continuous glass-fibre reinforcement is exemplary in reducing the induced strain, while at the same time offering superior strength.

Test reports can be found here.