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- W2189395770 abstract "Parallel-plate loading mechanism (ASTM D2412 standard test method) was used for investigating the long-term pipe stiffness values of HDPE, PE corrugated, PVC and ABS pipes by conventional and accelerated test procedures. The nominal inside diameters of the test pipes were 300 and 400 mm. Generally, long-term plastic pipe stiffness values decrease as increasing test duration and shown as an S-type long-term deflection curve for the test plastic pipes on a semi-log time scale. Long-term pipe deflection is a function of pipe material properties, pipe geometry, SDR value, and external loading conditions. The Rate Process Method (RPM) was used as the accelerated method for estimating the long-term pipe deflection and pipe stiffness value in conjunction with the parallel-plate loading mechanism. Long-term plastic pipe stiffness values were formulized based upon the test results. Many of today’s plastics were developed during and just before World War II. Some were introduced into piping systems in the 1930’s. Plastic piping systems obtained wide acceptance in the late 1950’s and early 1960’s. Since then plastic pipe usage has increased at an astounding rate. The primary benefits associated with all of these plastic piping products are the following: sustainability, corrosion resistance, chemical resistance, low thermal conductivity, flexibility, low friction loss, long term performance, light weight, variety of jointing methods, nontoxic, biological resistance, easy identification, and low maintenance. In general, thermoplastic piping is relatively flexible as compared to metal (rigid) piping. There are several types of thermoplastics, which are commonly used in the manufacture of pipe, such as Polyvinyl chloride (PVC), Acrylonitrile-butadiene-styrene (ABS), Polyethylene (PE), Polybutylene (PB), and Polypropylene (PP). Water mains, hot and cold water distribution, drain, waste, and vent (DWV), sewer, gas distribution, irrigation, conduit, fire sprinkler and process piping are the major markets for plastic piping systems throughout the world. Underground piping makes up the largest part of the market. Three parameters are most essential in the design or the analysis of any flexible pipe installation. They are load (depth of burial), soil stiffness in pipe zone, and pipe stiffness. Among of them, external loads and surrounding soil stiffness are controlled by site conditions. However, pipe stiffness is closely related to material properties and is an important design parameter." @default.
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- W2189395770 date "2010-01-01" @default.
- W2189395770 modified "2023-09-26" @default.
- W2189395770 title "PLASTIC PIPE LONG-TERM PIPE STIFFNESS BY CONVENTIONAL AND ACCELERATED TEST METHODS" @default.
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