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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsGeneral Corrosi...General Corrosi...Materials for NaOH Storage TankMaterials for NaOH Storage Tank
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12/6/2007 9:00 AM
 
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help urgent! what is the best material specification of bolts and nuts(for structural bolting) that can withstand the corrosiveness of caustic soda. the bolts and nuts will be submerged into the chemical stored inside the tank, the outside temperature of the tank does not exceed 50%C2ºC and only within the range of 24-46%C2ºC temperature, chemical pH is expected to be at its peak. at same consideration above (temp ranges from 24-46%C2ºC,pH level is peak), is it safe to use ASTM A36 Materials for the construction of the storage tank (material includes corrosion allowance)?How about, A36 as construction materials without internal painting(CA is still included).Thanks
 
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12/7/2007 9:00 AM
 
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Internal rubber lined tank will be prefered option for caustic storage service.PTFE coated bolts can withstand caustic corrosion.
 
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12/8/2007 9:00 AM
 
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what if i prefer not to use rubber or paint coated for the storage tank, however i i'll assume to have a 3mm internal corrosion allowance for the tank. will that be still safe? thanks krish123, this is a lot of help.
 
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12/8/2007 9:00 AM
 
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Trevor What Krish had suggested is a good possible protection from corrosion and also fairly economical (cost wise) proposal for your caustic soda usage purpose. You can choose to have a 3 mm C.A but you should recognize the fact that there will be uneven corrosion (pitting) in the tank with long usage. Unless you do not have facilities for Rubber lining and also to get Teflon coated bolts and studs for use, then you can think of a tank with higher corrosion allowance of 3 mm. With a known corrosion problem, it is safer to think of a protective and cost effective trouble free operation. Rubber lined internals with Teflon coated nuts and studs for use will give you more trouble free operation for this service. Hope this helps C.V.Srinivasan Nishi Engineers Pvt Ltd India Dec 09, 2007 E-mail: nishi@vsnl.com > >what if i prefer not to use rubber or paint coated for the >storage tank, however i i'll assume to have a 3mm internal >corrosion allowance for the tank. will that be still safe? > > >thanks krish123, this is a lot of help.
 
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12/9/2007 9:00 AM
 
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hi CVSRINIVASAN, can u give me an idea, if what will be the corrosion rate(mm/yr) of caustic soda chemical assuming the conditions i stated above ?(temp ranges from 24-46%C2ºC,pH level is peak,with no rubber/paint coating) thank you CVSRINIVASAN, more power!
 
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