HOBAS Pipes display excellent abrasion resistance as a result of the particularly elastic and very smooth liner produced by centrifugal casting.
The Darmstadt Institute of Hydraulic Engineering and Hydrology developed a method for testing resistance. Known as the Darmstadt Method, the test is now defined in various standards. It consists of placing a semicircular pipe section containing a specific sand/gravel/water mixture on a rocker, which alternately tilts up and down to simulate flow characteristics. Various pipe materials have been tested at the James Hardie Research and Engineering Laboratory in Australia. The wear was then measured at regular intervals on a 470-mm-long middle section of the test specimen. Next, the results were plotted as a function of the number of specimen movements.
The abrasion of HOBAS Pipes for standard applications detected during this test was 0.2 mm on average after 100,000 cycles. A series of tests carried out at the materials testing institute confirmed the results. The standard demands that the barrier layer must not be exposed anywhere after 100,000 cycles. Consequently, five times the safety factor is achieved with the 1 mm thick liner layer, of centrifugally cast pipes.