Maximum Galvanic potential . Designing for a water system 2

[Hercules28]

I am in the process of designing a device that will see some low RE flow of municipal water.
It is a multicomponent device so I was thinking: What is a safe galvanic potential difference I would use to select materials?

I guess there are many variables to it but without getting too deep can someone give me some guidance?
Temperatures would be normal - No freezing and no boiling.
Lifetime ~ 10years
Municipal water so it will be treated.

Thanks,

Herc

 

[cloa]

If the surface area of all parts with diferent metals is the same, 0.3 Volts is a reasonable maximum potential difference to not cause problems. Unfortunately that temperature range 0-100C is large to vary the potential difference considerably so normal values will be of limited value.

 

[EdStainless]

It is also a function of the water conductivity. In low conductivity water I have seen people go 500mV without issues.
A safe range is 250-300mV.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube