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Corrosion circuit breaking rule of thumb

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Corroneer

Mechanical
Joined
Jan 13, 2006
Messages
63
Location
SA
Dear all,

I was trying to find a reason why almost all corrosion circuit guidelines (of different companies) always use the 50 psi change in pressure and 25 F change in temperature to break the corrosion circuit and start a new one. While I understand (I think!) why they break the circuits at 25 F temperature change, I cannot find a reason behind the 50 psi (approx. 4 bar) rule!

Can somebody shed light on this?

By the way, for the 25 F (approx. 13 C) rule - I think this is because the corrosion rate of CS doubles every 10 C increase in temperature (a rule of thumb used in corrosion).

Regards,
Abdulaziz
 
First thing that pops to mind is partial pressure of hydrogen and H2S. Also possibly velocity effects or flashing liquid.

Different for different industries I imagine...


Nathan Brink
 
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