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415 

Pipeline and Haz. Matls. Safety Admin., DOT 

§ 172.334 

[Amdt. 172–101, 45 FR 74667, Nov. 10, 1980, as 
amended by Amdt. 172–81, 48 FR 28099, June 
20, 1983; Amdt. 172–110, 52 FR 29527, Aug. 10, 
1987; Amdt. 172–123, 55 FR 52593, Dec. 21, 1990; 
56 FR 66255, Dec. 20, 1991; Amdt. 172–151, 62 
FR 1228, Jan. 8, 1997; 65 FR 50459, Aug. 18, 
2000; 68 FR 57632, Oct. 6, 2003; 87 FR 79772, 
Dec. 27, 2022] 

§ 172.334

Identification numbers; pro-

hibited display. 

(a) No person may display an identi-

fication number on a RADIOACTIVE, 
EXPLOSIVES 1.1, 1.2, 1.3, 1.4, 1.5 or 1.6, 
DANGEROUS, or subsidiary hazard 
placard. 

(b) No person may display an identi-

fication number on a placard, orange 
panel or white square-on-point display 
configuration unless— 

(1) The identification number is spec-

ified for the material in § 172.101; 

(2) The identification number is dis-

played on the placard, orange panel or 
white square-on-point configuration 
authorized by § 172.332 or § 172.336(b), as 
appropriate, and any placard used for 
display of the identification number 
corresponds to the hazard class of the 
material specified in § 172.504; 

(3) Except as provided under § 172.336 

(c)(4) or (c)(5), the package, freight con-
tainer, or transport vehicle on which 
the number is displayed contains the 
hazardous material associated with 
that identification number in § 172.101. 

(c) Except as required by 

§ 172.332(c)(4) for a combustible liquid, 
the identification number of a material 
may be displayed only on the placards 
required by the tables in § 172.504. 

(d) Except as provided in § 172.336, a 

placard bearing an identification num-
ber may not be used to meet the re-
quirements of subpart F of this part 
unless it is the correct identification 
number for all hazardous materials of 
the same class in the transport vehicle 
or freight container on which it is dis-
played. 

(e) Except as specified in § 172.338, an 

identification number may not be dis-
played on an orange panel on a cargo 
tank unless affixed to the cargo tank 
by the person offering the hazardous 
material for transportation in the 
cargo tank. 

(f) If a placard is required by § 172.504, 

an identification number may not be 

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416 

49 CFR Ch. I (10–1–23 Edition) 

§ 172.336 

displayed on an orange panel unless it 
is displayed in proximity to the 
placard. 

(g) No person shall add any color, 

number, letter, symbol, or word other 
than as specified in this subchapter, to 
any identification number marking 
display which is required or authorized 
by this subchapter. 

[Amdt. 172–101, 45 FR 74667, Nov. 10, 1980, as 
amended by Amdt. 172–104, 51 FR 23078, June 
25, 1986; Amdt. 172–110, 52 FR 29528, Aug. 10, 
1987; Amdt. 172–123, 55 FR 52593, Dec. 21, 1990; 
56 FR 66255, Dec. 20, 1991; Amdt. 172–127, 59 
FR 49133, Sept. 26, 1994] 

§ 172.336

Identification numbers; spe-

cial provisions. 

(a) When not required or prohibited 

by this subpart, identification numbers 
may be displayed on a transport vehi-
cle or a freight container in the man-
ner prescribed by this subpart. 

(b) Identification numbers, when re-

quired, must be displayed on either or-
ange panels (see § 172.332(b)) or on a 
plain white square-on-point display 
configuration having the same outside 
dimensions as a placard. In addition, 
for materials in hazard classes for 
which placards are specified and identi-
fication number displays are required, 
but for which identification numbers 
may not be displayed on the placards 
authorized for the material (see 
§ 172.334(a)), identification numbers 
must be displayed on orange panels or 
on the plain white square-on-point dis-
play configuration in association with 
the required placards. An identifica-
tion number displayed on a white 
square-on-point display configuration 
is not considered to be a placard. 

(1) The 100 mm (3.9 inch) by 215 mm 

(8.5 inches) area containing the identi-
fication number shall be located as pre-
scribed by § 172.332 (c)(1) and (c)(2) and 
may be outlined with a solid or dotted 
line border. 

(2) [Reserved] 
(c) Identification Numbers are not re-

quired: 

Packaging: 

When: 

Then the alter-
native marking re-
quirement is: 

On the ends of 

portable tanks, 
cargo tanks, or 
tank cars.

They have more 

than one com-
partment and 
hazardous mate-
rials with dif-
ferent identifica-
tion numbers 
are being trans-
ported therein.

The identification 

numbers on the 
sides of the tank 
are displayed in 
the same se-
quence as the 
compartments 
containing the 
materials they 
identify. 

On cargo tanks .....

They contain only 

gasoline.

The tank is 

marked ‘‘Gaso-
line’’ on each 
side and rear in 
letters no less 
than 50 mm (2 
inches) high, or 
is placarded in 
accordance with 
§ 172.542(c). 

On cargo tanks .....

They contain only 

fuel oil.

The cargo tank is 

marked ‘‘Fuel 
Oil’’ on each 
side and rear in 
letters no less 
than 50 mm (2 
inches) high, or 
is placarded in 
accordance with 
§ 172.544(c). 

On one end of 

nurse tanks if 
that end con-
tains valves, fit-
tings, regulators 
or gauges when 
those appur-
tenances pre-
vent the mark-
ings and placard 
from being prop-
erly placed and 
visible.

They meet the 

provisions of 
§ 173.315(m) of 
this subchapter.

N/A. 

On cargo tanks, in-

cluding compart-
mented cargo 
tanks, or tank 
cars.

They contain more 

than one petro-
leum distillate 
fuel.

The identification 

number for the 
liquid petroleum 
distillate fuel 
having the low-
est flash point is 
displayed. If the 
cargo tank also 
contains gaso-
line and alcohol 
fuel blends con-
sisting of more 
than 10% eth-
anol the identi-
fication number 
‘‘3475’’ or 
‘‘1987,’’ as ap-
propriate, must 
also be dis-
played. 

(d) When a bulk packaging is labeled 

instead of placarded in accordance with 
§ 172.514(c) of this subchapter, identi-
fication number markings may be dis-
played on the package in accordance