49 CFR Appendix D to Part 180 - Appendix D to Part 180—Hazardous Materials Corrosive to Tanks or Service Equipment

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Appendix D to Part 180—Hazardous Materials Corrosive to Tanks or Service Equipment

This list contains materials identified either by proper shipping name in 49 CFR 172.101 or shipped under an “n.o.s.” shipping description that, under certain conditions, can corrode carbon steel tanks or service equipment at a rate that may reduce the design level of reliability and safety of the tank or equipment to an unsafe level before the next qualification. Materials identified on this list are considered corrosive to the tank or service equipment.

While every effort was made to identify materials deemed corrosive to the tank or service equipment, owners and operators are cautioned that this list may not be inclusive. Tank car owners and operators are reminded of their duty to ensure that no in-service tank will deteriorate below the specified minimum thickness requirements in this subchapter. See § 180.509(f)(3). In addition, FRA states a tank car owner must designate an internal coating or lining appropriately based on its knowledge of the chemical and not rely simply on this list. Regarding future thickness tests, this list may also be modified based on an analysis of the test results by the car owner, the Department of Transportation, or the Association of American Railroads' Tank Car Committee.

Hazardous Materials Table Proper Shipping Names (See § 172.101)
Acetic acid, glacial or Acetic acid solution
Aluminum chloride, solution
Arsenic acid, liquid
Arsenic acid, solid
Butyric acid
Ferric chloride, solution
Fertilizer ammoniating solution (Nitrogen fertilizer solution)
Fluoroboric acid
Fluorosilicic acid
Formaldehyde, solutions, flammable
Formaldehyde, solutions
Hydrobromic acid
Hydrochloric acid
Hydrochloric acid solution
Hydrofluoric acid and Sulfuric acid mixtures
Hydrofluoric acid
Hydrogen peroxide and peroxyacetic acid mixtures, stabilized
Hydrogen, peroxide, aqueous solutions
Hydrogen peroxide, stabilized or Hydrogen peroxide aqueous solutions, stabilized
Hypochlorite solutions
Nitric acid
Phenyl phosphorus dichloride
Phenyl phosphorus thiodichloride
Phosphoric acid solution
Phosphoric acid, solid
Phosphorus trichloride (Phosphorus chloride)
Sodium chlorate
Sodium chlorate, aqueous solution
Sodium hydrosulfide
Sulfur, molten
Sulfuric acid
Sulfuric acid, fuming
Sulfuric acid, spent
Zinc chloride, anhydrous
Zinc chloride, solution
Materials Transported Under an “N.O.S.” Description
Benzoic acid (Environmentally hazardous substance, liquid, n.o.s., (RQ 5,000 pounds)
Bisulphites, aqueous solution, n.o.s. (Ammonium bisulfide)
Black liquor (Corrosive liquids, n.o.s. (contains sulfuric acid))
Calcium lignosulfonate (not regulated under this subchapter)
Hexanoic acid (Corrosive liquids, n.o.s. (contains hexanoic acid))
Lignin liquor (not regulated under this subchapter)
Lithium chloride (not regulated under this subchapter)
Sodium polyacrylate (not regulated under this subchapter)
Titanium sulfate solution (Corrosive liquids, n.o.s. (contains sulfuric acid))
White liquor (not regulated under this subchapter)
[77 FR 37991, June 25, 2012]