English
Chinese (Simplified)
Indonesian
Japanese
by admin
Februari 7, 2022
by admin
DESIGN OF A DISTRIBUTED STRAIN MONITORING SYSTEM FOR HDPE WATER PIPELINES CROSSING AN EARTHQUAKE FAULT
Peter Hubbard, Linqing Luo, Andrew Yeskoo, Kenichi Soga, Krista (Moita) Araica, Gus Cicala, Marshall McLeod
# 2021 Amsterdam
Seismically active faults pose a risk to buried water pipelines that can be complicated to quantify. Fault type, slip rate, pipeline geometry, and soil conditions all factor into a complex soil-pipeline interaction. For critical pipelines that cross faults, high-density polyethylene (HDPE) has become an attractive material choice because of its accommodation of large deformations. Using HDPE increases the robustness of these pipelines, but it does not inform a utility about the actual deformed condition of a pipeline. This may be viewed as simply pushing a large break into the future when fault displacements are sufficient to rupture the pipe. By adding a distributed monitoring system to HDPE pipelines, the solution both increases the robustness of the water system and provides an information source that can be leveraged to make asset management decisions in the future, such as intervening measures to reduce stress buildup in a pipeline that has heavily deformed due to fault slippage. In this work, a distributed monitoring system has been designed to monitor two HDPE water pipelines that cross a strike-slip fault in California, USA. The system is based on fiber optic distributed strain sensing (DSS). The design process of the monitoring system is presented, as well as laboratory tests and lesson learned.
https://www.pe100plus.com/PPCA/DESIGN-OF-A-DISTRIBUTED-STRAIN-MONITORING-SYSTEM-FOR-HDPE-WATER-PIPELINES-CROSSING-AN-EARTHQUAKE-FAULT-p1810.html
upload by: Evi, PT Shuanglin Pipe Indonesia
Februari 2, 2022
by admin
UTILIZATION OF HDPE RECYCLED MATERIALS IN SANITARY SEWER APPLICATIONS
John M. Kurdziel
# 2021 Amsterdam
The use of recycled plastics in high density corrugated polyethylene pipe for storm sewers, highway culverts and general land drainage applications has now been widely accepted by municipalities and transportation agencies. This acceptance has made it possible to convert what was once considered a single use plastic product to a long-term infrastructure sustainable application. Possibly the last practical utilization of recycled plastics in infrastructure is their use in sanitary sewers. These installations have substantially higher requirements due to their depth of fill, higher effluent temperatures and the chemical content of the effluent. The balance between structural engineering design and long-term stress crack resistance creates a unique problem that must be carefully evaluated. This paper discusses these conflicting considerations and provides the means of adequately addressing them. It also discusses the ultimate limitations of recycled plastics as the internal pressures increase resulting in design conditions that negate their use. For although a short-term surge pressure can be accommodated with appropriate design requirements, a sustained pressure may ultimately result in a facility failing. This condition would be especially acute for any low head or pressure pipe applications.
Article Source: https://www.pe100plus.com/PPCA/UTILIZATION-OF-HDPE-RECYCLED-MATERIALS-IN-SANITARY-SEWER-APPLICATIONS-p1740.html
Upload by : Evi, PT Shuanglin Pipe Inconesia
Januari 24, 2022
by admin
A NEW GENERATION OF HIGH PERFORMANCE BIAXIALLY ORIENTED POLYETHYLENE AND POLYPROPYLENE PRESSURE PIPES
Taraiya, P. Degenhart, M. Soliman, M. Boerakker, R. Handstanger, R. Kleppinger
# 2021 Amsterdam
Since the introduction of polyolefins for pressure pipes, continuous improvements have been made to meet ever-higher demands on their performance and to expand their application window beyond their original scope, mostly based on new resin formulations. Today, we also continue to push the limit to provide better solutions. In this paper, we will highlight a route to produce biaxially oriented polyethylene and polypropylene pipes using our dedicated material formulations developed for this purpose. Continuous in-line biaxial pipe production line has been designed and constructed. The resistance to internal pressure, slow crack growth and chlorine dioxide resistance of pipes has been determined according to ISO 1167-1, ISO 13479 and ASTM F2023 respectively. These results were obtained by using 32mm and 63mm outer diameter pipes. This new generation of polyolefin pipes have shown a strong improvement over the whole property range, from internal pressure resistance to a two-fold improvement in chlorine dioxide resistance and a ten-fold improvement in slow crack growth performance. This solution is designed to meet today’s and the future’s demands. It has the potential to open up new application areas for polyolefin pipes.
article source: https://www.pe100plus.com/PPCA/A-NEW-GENERATION-OF-HIGH-PERFORMANCE-BIAXIALLY-ORIENTED-POLYETHYLENE-AND-POLYPROPYLENE-PRESSURE-PIPES-p1757.html
Januari 17, 2022
by admin
CONFIRMATION OF LONG SERVICE LIVES OF PE-PIPES UNDER HIGHER TEMPERATURES APPLYING CONVENTIONAL OVEN TESTS AND MODERN HIGH-PRESSURE AUTOCLAVE TESTS
Anja Armani, Helmut Zanzinger
# 2021 Amsterdam
PE-pipes are used in applications at temperatures higher than 40°C and long service lives like drainage pipes in landfill basal lining systems, drainage pipes in tunnels with high cover heights, geothermal applications, power plant technology, mining, underground cable protection pipes for power lines for renewable energy and underground pipes in hot climatic zones. For such demands PE-pipes must provide evidence of a high thermo-oxidative resistance. A PE-pipe was subjected to a very extensive test program to compare the oven aging method with the high-pressure autoclave test (HPAT) method regarding lifetime estimation. Oven tests had been carried out at four temperatures between 85°C and 100°C in a laboratory oven with air inlet for more than five years. Oxidation induction time (OIT) had decreased steadily. OIT described the thermo-oxidative stabilization of the polymer at measurement temperature in molten state. The significantly decrease showed that the stabilizer was consumed. Nevertheless, after even more than five years the mechanical properties changed only slightly.
In HPAT specimens were immersed in an aqueous medium in pressure vessel with O 2 gas phase. During the test elevated oxygen pressures and elevated temperatures were applied and the medium was steadily stirred. HPAT was performed at test temperatures between 60°C and 90°C and oxygen pressures between 165 kPa and 5,100 kPa. Additionally leaching in an alkaline solution was also considered in the HPAT. The estimation of lifetime at a service temperature of 40°C and atmospheric pressure were lying in the range of at least 280 years with activation energy found of around 94 kJ/mol. These HPAT results were achieved within a year. For modern PE-materials, the oven aging method was already reaching its limits for practicability, as the performance of the PE-material was so high that no results were achieved in acceptable times whereas the HPAT method could answer the lifetime question of the PE-pipe even for the highest performance.
Article source: https://www.pe100plus.com/PPCA/CONFIRMATION-OF-LONG-SERVICE-LIVES-OF-PE-PIPES-UNDER-HIGHER-TEMPERATURES-APPLYING-CONVENTIONAL-OVEN-TESTS-AND-MODERN-HIGH-PRESSURE-AUTOCLAVE-TESTS-p1781.html
Upload by: Evi, PT Shuanglin Pipe Indonesia
