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07218 The Use of a Lean Duplex Stainless Steel, UNS S32101, for Thermal Dimple Jackets on Vessels for High Purity Applications

Picture for 07218 The Use of a Lean Duplex Stainless Steel, UNS S32101, for Thermal Dimple Jackets on Vessels fo
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Product Number: 51300-07218-SG
ISBN: 07218 2007 CP
Author: Brian Uhlenkamp and James D. Fritz
Publication Date: 2007
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Most vessels and thermal dimple jackets for use in high purity applications, such as the pharmaceutical, biotech, food, dairy, and beverage industries, are constructed from type 304 (S30400) and mainly 316L (S31603) stainless steel. In these industries an embossed dimple jacket attached to the outside wall of the vessel usually performs product heating and cooling. With a dimple jacket either steam, cooling water or other media is passed through the interconnecting channels created by a network of dimples. The design typically involves a thin sheet of stainless steel shaped to create a network of dimples that is welded to the much thicker vessel wall. The severity of the thermal stresses and strains during rapid heating and cooling along with the corrosive conditions makes 316L dimple jackets susceptible to premature failures. This paper discusses the possible failure modes of type 316L dimple jackets including chloride stress corrosion cracking (SCC), crevice and pitting corrosion, thermal fatigue, and possible fabrication defects. The improved performance of S32101, a lean duplex stainless steel, is discussed and the results of qualification tests comparing 316L (S31603), S32101, and alloy 625 (N06625) are presented.
Most vessels and thermal dimple jackets for use in high purity applications, such as the pharmaceutical, biotech, food, dairy, and beverage industries, are constructed from type 304 (S30400) and mainly 316L (S31603) stainless steel. In these industries an embossed dimple jacket attached to the outside wall of the vessel usually performs product heating and cooling. With a dimple jacket either steam, cooling water or other media is passed through the interconnecting channels created by a network of dimples. The design typically involves a thin sheet of stainless steel shaped to create a network of dimples that is welded to the much thicker vessel wall. The severity of the thermal stresses and strains during rapid heating and cooling along with the corrosive conditions makes 316L dimple jackets susceptible to premature failures. This paper discusses the possible failure modes of type 316L dimple jackets including chloride stress corrosion cracking (SCC), crevice and pitting corrosion, thermal fatigue, and possible fabrication defects. The improved performance of S32101, a lean duplex stainless steel, is discussed and the results of qualification tests comparing 316L (S31603), S32101, and alloy 625 (N06625) are presented.
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