More hardness of the fin is required because it is used in heat
recovery of exhaust gases having abrasive particles in it.
The temperature might be around 450 deg. C and particles are abrasive
eroding the fin surface.
Please reply if you have some solution.
Thanks & Regards,
Priyanka Deshmukh
On 12/26/11, pgoswami <pgoswami@quickclic.net> wrote:
> Hi Priyanka,
>
> What are the design conditions for the air cooled finned exchangers, e.g
> operating media, design temperature , materials of construction? .Is the
> intended application is for refinery or other type of plants ?
>
> Generally pure aluminum is popular as fin material, however it does not
> offer much scope for improvement of hardness as this this material is not
> heat treatable. Improvement of hardness through surface coating or thermal
> spray may impair corrosion resistance and the heat transfer coefficient.
>
> Below are some extracts on recommended material of construction for fin
> tubes, typically for oil and gas applications from various appropriate
> specifications.
>
> Thanks
>
>
> Pradip Goswami,P.Eng.IWE
> Welding & Metallurgical Specialist & Consultant
> Ontario,Canada.
> Email-pgoswami@sympatico.ca,
> pgoswami@quickclic.net
>
>
> *
> Tubes with embedded aluminum fins or hot-dip galvanized steel fins,
> applicable up to a maximum operating temperature of 360 °C, should be used.
> Hot-dip galvanised steel fins shall not be used on austenitic steel tubing.
>
>
>
> *
>
>
> -----Original Message-----
> From: materials-welding@googlegroups.com
> [mailto:materials-welding@googlegroups.com] On Behalf Of Priya Deshmukh
> Sent: Saturday, December 24, 2011 1:24 AM
> To: materials-welding
> Subject: [MW:13288] To increase hardness of Heat Exchanger fin
>
> To,
>
> All.
>
> Please provide me the procedure to increase the hardness of fin material
> without affecting its thermal conductivity.
>
> May be some spray or liquid may be available, by spraying or dipping the
> fins into the liquid the hardness can be increased.
>
> Thanks,
>
> --
> Priyanka Deshmukh
>
> --
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