411 

Pipeline and Haz. Matls. Safety Admin., DOT 

§ 172.328 

(c) As an alternative to the marking 

required in (a) and (b) of this section, a 
label, tag, or sign may be displayed at 
each location (

e.g., 

manhole, loading 

head) where exposure to hydrogen sul-
fide vapors may occur. The label, tag, 
or sign must be durable, in English, 
and printed legibly and of a size rel-
ative to the package with a warning 
statement such as ‘‘Danger, Possible 
Hydrogen Sulfide Inhalation Hazard’’ 
to communicate the possible risk of ex-
posure to harmful concentrations of 
hydrogen sulfide gas. 

[76 FR 3367, Jan. 19, 2011, as amended at 80 
FR 1150, Jan. 8, 2015] 

§ 172.328

Cargo tanks. 

(a) 

Providing and affixing identification 

numbers. 

Unless a cargo tank is already 

marked with the identification num-
bers required by this subpart, the iden-
tification numbers must be provided or 
affixed as follows: 

(1) A person who offers a hazardous 

material to a motor carrier for trans-
portation in a cargo tank shall provide 
the motor carrier the identification 
numbers on placards or shall affix or-
ange panels containing the required 
identification numbers, prior to or at 
the time the material is offered for 
transportation. 

412 

49 CFR Ch. I (10–1–23 Edition) 

§ 172.330 

(2) A person who offers a cargo tank 

containing a hazardous material for 
transportation shall affix the required 
identification numbers on panels or 
placards prior to or at the time the 
cargo tank is offered for transpor-
tation. 

(3) For a cargo tank transported on 

or in a transport vehicle or freight con-
tainer, if the identification number 
marking on the cargo tank required by 
§ 172.302(a) would not normally be visi-
ble during transportation— 

(i) The transport vehicle or freight 

container must be marked as required 
by § 172.332 on each side and each end 
with the identification number speci-
fied for the material in the § 172.101 
table; and 

(ii) When the cargo tank is perma-

nently installed within an enclosed 
cargo body of the transport vehicle or 
freight container, the identification 
number marking required by § 172.302(a) 
need only be displayed on each side and 
end of a cargo tank that is visible when 
the cargo tank is accessed. 

(b) 

Required markings: Gases. 

Except 

for certain nurse tanks which must be 
marked as specified in § 173.315(m) of 
this subchapter, each cargo tank trans-
porting a Class 2 material subject to 
this subchapter must be marked, in let-
tering no less than 50 mm (2.0 inches), 
on each side and each end with— 

(1) The proper shipping name speci-

fied for the gas in the § 172.101 table; or 

(2) An appropriate common name for 

the material (e.g., ‘‘Refrigerant Gas’’). 

(c) 

QT/NQT markings. 

Each MC 330 

and MC 331 cargo tank must be marked 
near the specification plate, in letters 
no less than 50 mm (2.0 inches) in 
height, with— 

(1) ‘‘QT’’, if the cargo tank is con-

structed of quenched and tempered 
steel; or 

(2) ‘‘NQT’’, if the cargo tank is con-

structed of other than quenched and 
tempered steel. 

(d) After October 3, 2005, each on-ve-

hicle manually-activated remote shut-
off device for closure of the internal 
self-closing stop valve must be identi-
fied by marking ‘‘Emergency Shutoff’’ 
in letters at least 0.75 inches in height, 
in a color that contrasts with its back-
ground, and located in an area imme-

diately adjacent to the means of clo-
sure. 

(e) 

NON-ODORIZED marking on cargo 

tanks containing LPG. 

No person may 

offer for transportation or transport a 
cargo tank containing unodorized liq-
uefied petroleum gas (LPG) as author-
ized in § 173.315(b)(1) of this subchapter 
unless it is legibly marked NON-ODOR-
IZED or NOT ODORIZED on two oppos-
ing sides near the marked proper ship-
ping name as specified in paragraph 
(b)(1) of this section, or near the plac-
ards. The NON-ODORIZED or NOT 
ODORIZED marking may appear on a 
cargo tank used for both unodorized 
and odorized LPG. 

[Amdt. 172–123, 55 FR 52592, Dec. 21, 1990, as 
amended at 56 FR 66255, Dec. 20, 1991; Amdt. 
172–151, 62 FR 1228, Jan. 8, 1997; 62 FR 39045, 
July 22, 1997; 68 FR 19277, Apr. 18, 2003; 69 FR 
64471, Nov. 4, 2004; 81 FR 35540, June 2, 2016] 

§ 172.330

Tank cars and multi-unit 

tank car tanks. 

(a) 

Shipping name and identification 

number. 

No person may offer for trans-

portation or transport a hazardous ma-
terial— 

(1) In a tank car unless the following 

conditions are met: 

(i) The tank car must be marked on 

each side and each end as required by 
§ 172.302 with the identification number 
specified for the material in the 
§ 172.101 table; and 

(ii) A tank car containing any of the 

following materials must be marked on 
each side with the key words of the 
proper shipping name specified for the 
material in the § 172.101 table, or with a 
common name authorized for the mate-
rial in this subchapter (

e.g., 

‘‘Refrig-

erant Gas’’): 

Acrolein, stabilized 
Ammonia, anhydrous 
Ammonia solutions (more than 50% ammo-

nia) 

Bromine 

or 

Bromine solutions 

Bromine chloride 
Chloroprene, stabilized 
Dispersant gas 

or 

Refrigerant gas (as defined 

in § 173.115 of this subchapter) 

Division 2.1 materials 
Division 2.2 materials (in Class DOT 107 tank 

cars only) 

Division 2.3 materials 
Formic acid 
Hydrocyanic acid, aqueous solutions 
Hydrofluoric acid, solution