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How to convert PPMw (by weight) to PPMv(Volume) for H2S & moisture(H2O) in gas mixture?
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Submitted Chris Haslego, Nov 21 2011 11:21 AM | Last updated Nov 21 2011 01:29 PM

Category:	Corrosion
Question:	Are carbon steel storage tanks appropriate for NaOH solutions?
Keywords:	v1i12,naoh,caustic,storage,tank,materials,carbon,steel,stress,relief,relieving
Answer:	Carbon steel storage tanks can be used for NaOH storage tanks under certain conditions. Carbon steel tanks with no stress relieving can be used in the following situation:A. NaOH concentration below 20% by weight, up to about 160 ??F (70 ??C)B. NaOH concentration from 20-30% by weight, up to about 140 ??F (60 ??C)C. NaOH concentration from 30-50% by weight, up to about 120 ??F (50 ??C)The use of carbon steel tanks in this service can be extended by stress relieving welds and bends. A tank that has been stress relieved can be used in the following situations:A. NaOH concentration below 20% by weight, up to about 220 ??F (105 ??C)B. NaOH concentration from 20-30% by weight, up to about 210 ??F (99 ??C)C. NaOH concentration from 30-50% by weight, up to about 170 ??F (77 ??C)Beyond these constraints, a nickel alloy material will generally need to be considered. There are also some types of plastics that can be used for NaOH storage. Reference: Chemical Engineering Magazine, September 2000
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