corrosion by isobutane 2

[Cormet]

where can i find corrosion rates isobutane Vs. carbon steel and isobutane Vs. austenitic stainless steel??

Temp : 100F
Press : 225 psia

Cormet

 

[dcasto]

IC4 isn't corrosive. If you saturate it with water or add water to it, then the water is corrosive. If you add Sulphur bearing compunds to it along with water, then thy Sulphur compounds will be corrosive.

 

[strider6]

I agree, if it's pure isobutane, without water or any other product it's not corrosive to Carbon Steel or Stainless Steel.

regard

S.

http://www.corrosionist.com

 

[0707]

to get a consistent answer we need to know what kind of contaminants are expected in your isobutane flow.

Luis Marques

 

[Cormet]

Pure Isobutane. No other chemicals present.

 

[Cormet]

you've mentioned that if water is present, then it is corrosive.

where can I find these corrosion rates publised??

I've already tried CORSUR (NACE) w/o luck!!!!!!

Thanks,

Cormet

 

[EdStainless]

It will depend on what other impurities are there. If the system is truly pure then you will not have corrosion.

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Rust never sleeps
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http://www.trent-tube.com/contact/Tech_Assist.cfm

 

[unclesyd]

Isobutane mixed with all manner of stuff is used as an aerosol propellant with no problems.

In looking at 2 aerosol products with water as one of the main ingredients I see nothing that stands out as a corrosion inhibitor.

Water by itself can be very corrosive to steel even with inerting gases. I can't recall see water in steel containers without any corrosion.

All of my canned water, Budweiser, is in Aluminum cans.

 

[kenvlach]

unclesyd, the beer in aluminum cans doesn't contact bare aluminum (except through fresh popped tops). If uncoated metal, both Al & beer would degrade.

With the recent losses of SS beer kegs to scrap metal thieves, the breweries might consider a return (for some) to aluminum kegs. These were spray coated inside with a food-grade wax. Empties were steam cleaned and re-coated.

 

[unclesyd]

I looked at a few more aerosol cans and have have isobutane as the propellant and again I see nothing that would act as a corrosion inhibitor. Two of the products list water as the main ingredient.

kenvlach,

My cans are "real water" given out during hurricane Ivan by the Budweiser Co.

You should have seen the crowd form when a red Budweiser truck pulled into a distribution center.

 

[dcasto]

For a science project my son and I put steel wool in baby food jars ans added water. The one with 1/2 full water and air rusted badly. The one that we bubble nitrogen into for a long while and then sealed it up had spot or two of rust. We bubbled air ito the water on another and filled the jar 100% full, it rusted real bad. We boiled water and put it in 100% full, almost no rust. I think we proved it takes O2, water , and iron to make rust.

 

[strider6]

Cormet,

You'll not find in CorSur or other DataBase isobutane+water. To know the corrosion rate of your fluid, is necessary to understand where this water come from, and the type of systems (is it a tank, a pipe, a can?).
Water, mainly, is corrosive if it contains dissolved O2 or H+, acids. If you have a closed systems, with water with a certain amount of O2 dissolved at pH near neutral, you will have corrosion until all the O2 is consumed by the corrosion process. Once the O2 is consumed you 'll not have any corrosion unless some O2 can enter the system and dissolve in water.
In my opinion if you want to assess the potential corrosivity of your system you have to define:
-type of item (tank,pipe...)?
-is it a closed system or open in contact with air? it will be stagnant water?
-what type of water you'll have; formation water, condensing from a gas...., and the chemistry (chloride?)

without all this information is not possible to say something.

regards

Strider

http://www.corrosionist.com