No-Dig Winners

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John Kraft, Trenchless Technology Center (TTC)

Category: Student Paper

Country: USA

Alternative Approach for Assessment of Hydraulic Design Basis for Pressure Pipe Liners

 

image 1 - Samples Prepared for ASTM D2992 Testing.
image 2 - Testing Fixture Used to Perform Tensile Creep Testing

New product development requires stringent testing to ensure that strength and safety standards are met. When developing a new pipe material several factors are tested for. In addition to normal material characteristics such as elastic modulus of pipe materials, long-term hydrostatic strength (LTHS) and hydrostatic design basis (HDB) are needed. LTHS and HDB as described in ASTM D2992 are two characteristics that can prove very challenging to conduct.

The purpose of this testing is to generate ductile failures that are not typically seen during short- or long-term testing methods. These failure modes include wall fracture, localized leaks, or weeping. Successfully generating these failures can be very hard to achieve. These full-scale samples also consume large areas of climate-controlled space. The area required by this test can be seen in first illustration. In an effort to reduce the burden a modified testing procedure has been developed. The analysis method used is closely related to the method described in the ASTM D2992 standard but the method used to test the samples is a modified form of the test apparatuses used for ASTM D2990 long-term creep testing.

This newly proposed testing method can be seen in the second illustration. Strain will be used in the place of the typical failures. Short- and medium-length tests will be performed to determine the proper ranges for the long-term test. With this information, long-term testing can be started and the strain data monitored until the prescribed failures have taken place.

By following this test method the space required could be reduced by 80%. The reduction in space and ease of sample preparation will reduce the cost of performing the test by more than half. In addition to the initial setup cost, having to add or replace samples following this new method is also more efficient and less costly. This method will hopefully be a beneficial contribution to trenchless technology worldwide.

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