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Anonymous Poster

Heating Tubes In Heat Exchangers

06/17/2010 2:14 AM

Dear Sirs,

I need your technical assestance please,
I'm going to change the heating tubes for A and B vacuum boiling pans to be of st. st. tubes instead of carbon steel tubes
I have two alternative grades of st. st. tubes
the 1st alternative is AISI 316
the 2nd alternative is AISI 439
I find AISI 439 is higher than AISI 316 in heat transfere coefficient and it has good prformance in tube expander than AISI 316, but i`m not sure is it perfect in practice or not
Also I find the price of AISI 439 is more less than AISI 316
Could you please advise me by your experience, is AISI 439 suitable

for our applications or not

thank you in advance for your kind help

Ahmad E. Khalil
E-mail: khalildsc@yahoo.com
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Tornado
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#1

Re: Heating Tubes In Heat Exchangers

06/17/2010 3:12 AM

What are the fluids involved on each side of your HX? In general, 316SS is superior for corrosion resistance, but this varies with the environment.

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khalildsc
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Join Date: Dec 2008
Posts: 1
#3
In reply to #1

Re: Heating Tubes In Heat Exchangers

07/01/2010 12:34 AM

the hot side is water vapour +130 oC and the cold side is sugar syrup 65o Brix
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jvrj
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Posts: 198
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#2

Re: Heating Tubes In Heat Exchangers

06/18/2010 2:31 AM

Aisi 316 has excellent corrosion resistance, however it is also prone to stress corrosion. The continuous expansion and contraction will eventually result in failure. Best to double check with the supplier wether 439 will do the job.

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