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UNS S32707 Combined to UNS S31266; An Alternative to Titanium for Seawater-Cooled Heat Exchangers

Picture for UNS S32707 Combined to UNS S31266; An Alternative to Titanium for Seawater-Cooled Heat Exchangers
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Testing is performed in seawater cooled scale model heat exchangers with 0.5 ppm residual chlorine during a period of 18 months. Thus, it shows a corrosion resistance of the materials at a heat flux representative to a tube skin temperature up to 95°C inside in the seawater.

Product Number: 51317--9421-SG
ISBN: 9421 2017 CP
Author: Josefin Eidhagen
Publication Date: 2017
Industries: Water/Wastewater , Maritime
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In the process industry seawater is commonly used when available to cool process fluids. However chlorination of the seawater is widely used to limit any microbial activity; that makes the environment quite aggressive. Chlorination oxidizes and increases the corrosion potential to approximately +600mVSCE for stainless steels and leads to higher susceptibility to localized corrosion.Super duplex stainless steels PRENw* >40 in seawater-cooled heat exchangers can be used at limited temperatures otherwise Ti Gr.2 shall be used for equipment integrity over the service life.Recent results with combination of hyper duplex UNS S32707 tubes and super austenite UNS S31266 plate with PRENw* of 49 resp. 53 for seawater-cooled heat exchangers are presented. Testing is performed in seawater cooled scale model heat exchangers with 0.5 ppm residual chlorine during a period of 18 months. Thus it shows a corrosion resistance of the materials at a heat flux representative to a tube skin temperature up to 95°C inside in the seawater.These new results also show a good correlation with field service and have given a wider operation window for stainless steels in seawater-cooled heat exchangers.*Pitting resistance equivalent PRENW = %Cr + 3.3(%Mo+0.5%W) +16%N

Key words: Seawater, pitting corrosion, chlorination, heat exchanger, cooling, hyper duplex stainless steels, super austenitic stainless steels, UNS S32707, UNS S31266

In the process industry seawater is commonly used when available to cool process fluids. However chlorination of the seawater is widely used to limit any microbial activity; that makes the environment quite aggressive. Chlorination oxidizes and increases the corrosion potential to approximately +600mVSCE for stainless steels and leads to higher susceptibility to localized corrosion.Super duplex stainless steels PRENw* >40 in seawater-cooled heat exchangers can be used at limited temperatures otherwise Ti Gr.2 shall be used for equipment integrity over the service life.Recent results with combination of hyper duplex UNS S32707 tubes and super austenite UNS S31266 plate with PRENw* of 49 resp. 53 for seawater-cooled heat exchangers are presented. Testing is performed in seawater cooled scale model heat exchangers with 0.5 ppm residual chlorine during a period of 18 months. Thus it shows a corrosion resistance of the materials at a heat flux representative to a tube skin temperature up to 95°C inside in the seawater.These new results also show a good correlation with field service and have given a wider operation window for stainless steels in seawater-cooled heat exchangers.*Pitting resistance equivalent PRENW = %Cr + 3.3(%Mo+0.5%W) +16%N

Key words: Seawater, pitting corrosion, chlorination, heat exchanger, cooling, hyper duplex stainless steels, super austenitic stainless steels, UNS S32707, UNS S31266

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Case study: A Steam Assisted Gravity Drainage facility in northern Alberta, Canada is examined as it experienced two very similar failures in heat exchanger tubes within 2 years of each other due to a boiler feedwater tank without a nitrogen blanket and a low flow condition.
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