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Giovannyespm
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Corrosion Protection For Oil Tank Of A Hydraulic System

01/09/2013 12:59 PM

I've been participating in a design of an oil tank for a hydraulic system. Formerly, it has been made of carbon steel but there has been problems with impurities in the oil, that's why it has thought making the tank of stainlees steel. It's known that Stainless steel has thermal conductivity much less than carbon steel, then the heat flux between oil and atmosphere would be less and harmful, and it would be necessary to implement a cooling system. Could you give me some advice about a solution without implementing the cooling system?
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Doorman
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#1

Re: Corrosion protection for oil tank of a hydraulic system

01/09/2013 1:07 PM

Is is possible to increase surface area and weld radiating fins to the reservoir?

What has this to do with corrosion protection

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ozzb
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#2

Re: Corrosion Protection For Oil Tank Of A Hydraulic System

01/09/2013 1:41 PM

Impurities in the oil where did they come from what are they? Closed system?

If the impurity is water then the tank maybe too large. There is not heat being generated to evaporate it off. This happens in a system that is used infrequently or cycle time is too brief to heat the oil. Tank heater will correct this.

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lyn
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#3

Re: Corrosion Protection For Oil Tank Of A Hydraulic System

01/09/2013 2:46 PM

Go with a 400 series and you'll be OK.

I assume that you already know the operating temperature of the oil so just run some heat dissipation numbers on CS and SS and see if you really need a cooling system.
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#4

Re: Corrosion Protection For Oil Tank Of A Hydraulic System

01/09/2013 2:52 PM

Hydraulic systems have been employing mild steel reservoirs for decades with no issues. The impurities likely have nothing to do with your tank, although that's where they all end up. Nearly all of my customers use steel tank that have a red oxide primer coating inside the tank to prevent water damage (Rust), and this has been working perfectly well for literally 50 years.

Any Hydraulic system that's being used for any period of time will need a heat exchanger regardless of tank material.

Any Hydraulic system with known contamination problems are almost always the result of worn out components and poor filtration practices.

I suggest you take an oil sample and send it off to a independent lab for analysis. They can tell you exactly what is in your oil to help you determine which parts are causing your issues.

  • If they find high levels of brass, you can almost bet your pump (or hydraulic motor) is going out.
  • If they find high levels of chromium you can almost bet your cylinders are going out.
  • High levels of acid can mean a few things, none of which are good.
  • High levels of bacteria can be a silent killer, causing reduced performance of your oil & additives which increase wear and corrosion.
  • High levels of water indicate you're breather is pulling in atmospheric moisture, and should be changed to a desiccant style breather to avoid this.
  • High levels of iron oxide indicate that the water you've been pulling into your system has decided to attack your (scratched, or improperly commissioned) mild steel tank (which I'm guessing doesn't have the red oxide finish to avoid this) and is introducing contamination into your system.

I guess what I'm saying, is you cannot expect to simply change out your tank to solve your problems if you aren't sure exactly what your problems are.
If it were my project, I would have the tank cleaned and coated inside and out with a coating recommended by your local hydraulic shop. I wouldn't even think about replacing the tank with a stainless tank, at worst I would have it replaced with a proper Mild steel tank.
-R

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metalSmiths
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#5

Re: Corrosion Protection For Oil Tank Of A Hydraulic System

01/09/2013 3:29 PM

If tank is rusted you can clean it with muriatic acid diluted 20:1. Then use a gas tank sealer kit like this one from Eastwood. Like others have said find out where the impurities are coming from. Also if water is getting into the system, is it from condensation or some other source. Also a filter system if one is not already in place could/would help.

Though a simple cooling system can be a radiator and/or fan installed on the return line to the tank sized for the heat needed to be removed.

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nick name
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#6

Re: Corrosion Protection For Oil Tank Of A Hydraulic System

01/11/2013 8:27 AM

I think that you have NOT to worry. The heat transfer limitation is NOT given by the wall conduction it is given by the free convection coefficient of air. To give you a feeling air in free convection has a coefficient of around 10 W/m²°C. Carbon steel has around 50 W/m°C and stainless steel about half or a third. On internal side oil has about 200 W/m²°C. The total thermal resistance will be Rcarb= 1/200+0.006/50+1/10=0.105 °/Wm², in the second case Rss= 1/200+0.006/15+1/10=0.1054°/Wm².

As I wrote several times engineering is a precise profession which is based on quantities not qualitative analysis only. This is a case when computing even simplified is a MUST.
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#7

Re: Corrosion Protection For Oil Tank Of A Hydraulic System

08/14/2023 10:54 AM

Well, the job of a <...tank...> is to let the level go up and down.

The job of a <...cooling system...> is to get rid of heat.

It isn't immediately obvious how there can be carried out in the same piece of equipment. It isn't immediately obvious how replacing the structure with one made of a different material would make any difference.

It isn't immediately obvious why <...impurities in the oil...> could or would cause <...problems...> and knowing the nature of these would certainly help.

Then, this is CR4, and many posts are known for their incomplete nature.

Temperatures. Pressures. Volumes. Flowrates. Pipe sizes...

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