Typical grating resistant to Sulfuric Acid 4

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We have a very simple trench 3' wide x 2' deep for 93% concentrated sulfuric acid containment that we're going to be covering with grating.

Anyone have any experience with what type of material would be best suited? The best I can find is 316 stainless is "fair" with respect to corrosion but not recommended for continuous use.

 

[EdStainless]

How about a high Si (14.5%) Cast Iron?
"Polymer coatings on steel or stainless steel are used in this range of acid strengths.
Phenolic and baked phenolic coatings are used at ambient temperatures for sulfuric
acid up to 98% concentration."
PVDF might work as well (with glass reinforcement).
Or just use carbon steel and replace it regularly.


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[JLNJ]

Have you tried calling the FRP grating guys? Maybe sulfuric acid is so nasty that even FRP won't suffice.

 

[EdStainless]

Epoxies don't like sulfuric, expect for some exotic formulations.

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[JedClampett]

Note that 93% sulfuric might be less corrosive than diluted. So if they might want to wash it down, you will end up with a more aggressive acid. But it looks like FRP with the right resin will work. See attached.

 

[canwesteng]

Have seen FRP done in electroplating plants where SO is the electrolyte... seems to last well all things considered.

 

[TLHS]

Yeah, an FRP of some type is generally the first look for chemical applications. Looks like some of the available materials can do constant exposure:

https://www.americangrating.com/molded-frp-grating-chemical-resistance-guide.aspx

 

[dik]

TLHS... Thanks for the link

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-Dik

 

[EdStainless]

If you actually expose FRP to straight 93% it will decompose quickly.
Most of the resins top out at 70% acid.


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[HTURKAK]

You did not supply a lot info. here and i could not imagine your case... Can you provide some descriptive sketches ?

In past , our company designed and constructed large scale H2SO4 tanks ( for fertilizer plants etc). The tanks are carbon steel construction , supported on grids on dwarf walls . The containment area lined with acid resistant tiling and bricks.

If the channel 3' wide, my suggestion would be the use of carbon steel grating and replace regularly as necessary ( proposed by
EdStainless (Materials))

Pls have a look to the following ling to get more info . regarding H2SO4

http://www.sulphuric-acid.com/TechManual/Storage/storagetanks.htm

I cannot give you the formula for success, but I can give you the formula for failure..It is: Try to please everybody.

 

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The grating will be covering a 26’-0” x 3’-0” linear trench within a containment area designed to contain 93% max solution of sulfuric acid if spilled. The likelihood this actually sees the acid is very low and from the responses it may be best to have the client use typical carbon steel/wash/replace as necessary.