Plastic Pipes Conference Association # 2023 Lake Buena Vista
Harry Mavridis
Demand for thick-wall (i.e., greater than about 2”-3” in thickness[15] ) HDPE pressure pipe is increasing worldwide for water, mining and oil & gas gathering applications. Resin producers have been developing HDPE resins that combine performance requirements (PE4710 or PE100) with processability attributes needed for thick-wall pipe, while pipe extruder manufacturers and converters have made advances in equipment and methods to optimize the process for maximum pipe wall thickness and thickness uniformity from a given resin. The present paper is concerned with a firstprinciples analysis of the pipe extrusion sag effect and the development of a rheological test for the purpose of characterizing the sag resistance of a particular HDPE resin or composition. A single metric is extracted from the rheological test so that multiple HDPE candidate materials can be compared. The test can fundamentally account for melt temperature and molecular weight effects and can be useful for HDPE pipe quality control and characterization purposes. A mathematical model is also presented to predict the pipe thickness variation for a given HDPE resin and pipe extrusion setup, based on polymer rheology and pipe processing conditions. The model can predict effects of resin rheology, melt temperature, pipe dimensions and processing conditions (e.g., effect of die offset or internal pipe cooling).
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