Effect of Zinc Sacrifical Anode installed in a Diesel Tank 1

[ak1965]

This is something new and unconventional.... we are trying to protect the bottm of a Diesel Tank (AGO - Automotive Gas Oil) by installing 03 Nos. Zinc Sacrifical anodes on the tank bottom inside.

Query:-

1. Diesel in the tank is supplied to GT for liquid firing. Just wish to know while Zinc anode is slowly dissolving or mixing in the diesel, would anyway affect the Diesel quality and likely to create problem in GT operation??

2. I understand presence of Ash forming material is not allowed in the FUel for GT. However, I don not know whether Zinc will affect the diesel in any fashion??

Please comment ...your reply may affect our decision to go for Insatalling Zinc Sacrifical Anode in the tank.

 

[Metalguy]

Don't know about the effects of zinc oxide, but IF you can use a simple impressed current CP system you won't have to worry about the fuel.

"You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein

 

[SJones]

The zinc will principally dissolve into the water phase. It is assumed that a coating is also being applied to the tank bottom and a portion of the wall. A heavy duty lining like GRP would not require supporting CP.

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04

 

[ak1965]

Impressed current system is not as economical as Zinc Anode...!

My contention is to know the effect of zinc onto the Diesel that is supplied from this tank to GT for liquid firing.

I believe that metal traces in GT fuel causes ASH deposit on turbine blades and help corrosion in GT.

 

[metengr]

ak1965;

My contention is to know the effect of zinc onto the Diesel that is supplied from this tank to GT for liquid firing.I believe that metal traces in GT fuel causes ASH deposit on turbine blades and help corrosion in GT.

To be frank, I would not want to have any contaminants in this fuel if you are using it for GT's. Regarding your second statement above... where zinc would help in corrosion, what source or where did you hear this? I believe low melting zinc would be harmful if it plates on the airfoils.

 

[Metalguy]

I think he meant the zinc would cause corrosion. Not much is needed for LME/SME at GT temps.

"You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein

 

[racookpe1978]

Other way around: He wants to use zinc inside the tank to prevent water in the diesel fuel from corroding the tank, but the displaced Zn ions in the fuel may/or may not affect the CT blades.

I don't know - call your CT blade supplier. Of course, since your CT blade supplier wants to sell you more CT blades, can you trust his answer? 8<)

 

[Ron]

Why are you putting the anodes inside the tank? Generally those are installed outside and placed in the soil as the corrosion potential between the soil and tank can be relatively high.

 

[ak1965]

Metengr,

Thanks ... please see attached literature from GE indicating effect of metals in GT fuel......!

Though zinc is not specifically mentioned, however it can be trated like Magnesium which forms ash in diesel fuel for GT.