Plastic Pipes Conference Association # 2021 Amsterdam
Steve Sandstrum, Chris Ziu
The market for high performance polypropylene (PP) piping systems in North America continues to evolve. Generally, PP piping systems have performed exceptionally well in a variety of challenging HVAC, industrial and plumbing applications. As a result, the engineering community in North America is embracing higher performance PP piping systems as an attractive alternative to traditional metal pipe applications in a variety of installations.
This presentation will address a project at the University of Illinois in the United States that dealt with a high-temperature hydronic heating system that was installed on the main campus in Urbana-Champaign, Illinois. The University has used traditional PP-R in the past, and in more recent times has selected the higher performance PP-RCT class of PP materials. The mechanical staff there is very familiar with the chemical and corrosion resistance and the long-term performance capability of PP-RCT piping systems, especially for higher temperature water applications.
When considering the expansion of their physical plant and the associated high temperature hydronic heating system, the University was faced with some challenging design considerations. This discussion will focus on the following:
a) The basic properties of the PP-RCT material used to produce the pipe installed in this project,
b) The design considerations that led to the specification of a unique dual-wall pre-insulated piping system,
c) The attributes of the 1400 feet (426 meters) of pre-insulated dual wall PP-RCT pipe 6.625 inch (168 mm) DR 7.3 inner core pipe within 10.750 inch (273 mm) DR 17 outer jacket pipe that was supplied for this project, and
d) A multitude of innovations that became apparent as the system was installed such as simultaneous dual-wall fusion, traditional underground burial and horizontal directional drilling for a significant portion of the project.
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