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03609 POLYTHEYLENE FABRICATED FLANGE FAILURES

Picture for 03609 POLYTHEYLENE FABRICATED FLANGE FAILURES
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Product Number: 51300-03609-SG
ISBN: 03609 2003 CP
Author: Scott Whitlow
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Large diameter fabricated high density polyethylene (HDPE) flanges have been used successfully in a variety of industries and applications. However, fabricated flange failures at two DuPont Gulf Coast plants resulted in expensive field repairs and one failure caused a significant production loss. Both HDPE lines were in cooling water service and both failures occurred in a flange-to-stub-end weld made in seemingly ideal conditions at a shop (as contrasted to the difficulty of making field welds). The failed components are 36" (914 mm) diameter, one flange is 13.5 SDR and the other is 11 SDR. One flange failed because of thermal degradation during welding, while the second flange failed due to a cold weld. This paper describes the field assessment, field repair and failure analysis for each flange. KEYWORDS High density polyethylene, HDPE, flange, failure analysis, polymer.
Large diameter fabricated high density polyethylene (HDPE) flanges have been used successfully in a variety of industries and applications. However, fabricated flange failures at two DuPont Gulf Coast plants resulted in expensive field repairs and one failure caused a significant production loss. Both HDPE lines were in cooling water service and both failures occurred in a flange-to-stub-end weld made in seemingly ideal conditions at a shop (as contrasted to the difficulty of making field welds). The failed components are 36" (914 mm) diameter, one flange is 13.5 SDR and the other is 11 SDR. One flange failed because of thermal degradation during welding, while the second flange failed due to a cold weld. This paper describes the field assessment, field repair and failure analysis for each flange. KEYWORDS High density polyethylene, HDPE, flange, failure analysis, polymer.
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