L.O. Tank internal coating

[kahlilj]

does anyone know if a horizontal, aboveground, lube oil tank at atmospheric pressure needs an internal coating? or is this something that is done as a "best practice"?

is there a spec which requires this coating (or corrosion allowance)? if so can someone tell me what it states?

thanks,
kgj

 

[22320ajv]

For this kind of product "clean" Lube Oil, the storage tank does not require internal coating. Even so that depends of owner requiremens. Regarding corrosion allowance the minimun shall be 1/16" according to API 620 Appendix "G"

 

[kahlilj]

thx 22320, but i got a different response from another person on here:

>rlewis (Mechanical) wrote: 11 May 05 9:28
>
>The portion of the tank which is below the oil level will >not corrode, however the portion above the oil probably >will. You've also got a commissioning period when the >tank is empty to worry about. Corrosion products from >hte tank will contaminate the oil. For this reason, in >critical services, oil tanks are made from stainless. >For less critical services where you want to save some >cost, I would recomend CS with a coating. You might get >by with an uncoated tank, especially if you kept a dry >air or nitrogen purge on it, but for my money, it isn't >worth the risk.

i tend to favor/agree with this approach, what do you (and everyone else) think?