# REG Scan — Hazardous Materials Safety Interpretation

- **operation:** document
- **citation:** 06-0050
- **title:** REG Scan — Hazardous Materials Safety Interpretation
- **source type:** guidance
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** guidance
- **official:** true
- **published on:** 2006-03-31
- **effective on:** Not available
- **summary:** 06-0050 response to REG Scan concerning 172.302.
- **machine formats:** - **json:** https://regulus.evalyn.ai/document/phmsa-interpretation-06-0050.json
- **markdown:** https://regulus.evalyn.ai/document/phmsa-interpretation-06-0050.md
- **app url:** https://regulus.evalyn.ai/document/phmsa-interpretation-06-0050
- **source url:** https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/2006/060050.pdf
**body:**

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S. Departme
Transportatic
Washington, D.C. 20590
400 Seventh Street, S.W.
Pipeline and
Hazarcious Materials Safety
Administration
MAR 31 2006
Mr. Russ Shanahan
Ref. No.: 06-0050
800 West Fourth Street
REG Scan
Williamsport, PA 17701
Dear Mr. Russ Shanahan:
This responds to your letter dated February 14, 2006 regarding the marking requirements
under the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180) as they apply
to the display of identification number marking on a closed transport vehicle containing
multiple bulk packages.
Q1.
Are two "UN1993" identification number markings required to be displayed on a
closed transport vehicle containing two bulk packagings of a material described
as "Flammable liquid, n.o.s., 3, UN 1993, PG 1."
Al.
For a bulk packaging contained in or on a transport vehicle or in a freight
container, if the identification number marking on the bulk packaging is not
visible, the transport vehicle or freight container must be marked on each side and
each end with the identification number specified for the material in the § 172.101
Table (See § 172.332).
identification number and displayed as required by § 172.332 on each side and
As specified in § 172.302(a), a bulk packaging must be marked with the
each end of the bulk packaging, if the capacity of the packaging is 3,785 L (1,000
gallons) or more, or on two opposing sides, if the packaging has a capacity of les:
han 3,785 L (1,000 gallons). Additional requirements for marking bull
packagings, such as a portable tank, cargo tank, tank car and multi-unit tank car
tank, and other bulk packaging (e.g., IBCs) are prescribed in §§ 172.326, 172.328,
Q2.
Would the answer to "Ql" change if the products had the same technical names?
A2.
No.
Q3.
Are the two identification number markings, "UN1993" and "NA1993", required
to be displayed on a closed transport vehicle containing two bulk packagings of
172.302
060050
172.331

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materials described as "Flammable liquid, n.o.s., 3, UN 1993, PG 1" and
"Combustible liquid, n.o.s, Combustible liquid, NA 1993, PG III."
A3.
See answer "Al". In this case, the identification numbers are essentially the
same. The marking "UN1993" is used for both domestic and international
transportation, while the marking "NA1993" may only be used for domestic
transportation.
with § 172.504.
Each bulk packaging must be placarded in accordance
I hope this information is helpful. If we can be of further assistance, please contact us.
Sincerely:
John A. Gale
Chief, Standards Development
Office of Hazardous Materials Standards

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Engram
$172.302
§172.331
Markings
:::::
REGSCan.
the smarter way to know
86-0050
Feb 14, 2006
Director of Hazardous Materials Standards
Mr. Edward T. Mazzullo
400 7th St South-West
US DOT/PHMSA (PHH-10)
Washington, DC: 20590-0001
RE: Letter of Interpretation - Multiple Bulk ID Marking Requirements
Dear Mr. Mazzullo,
each of these questions, please assume that each bulk package is contained within a truckload and no part of the bulk
I would appreciate a clarification on vehicle marking requirements when multiple bulk packages are on board. For
package is exposed from the outside.
1. Given this load:
Flammable Liquid, n.o.s., 3, UN1993, PG I, Bulk
Flammable Liquid, n.o.s., 3, UN1993, PG I, Bulk
Are two 1993 markings required on the vehicle, or is only one 1993 marking required on the vehicle?
2. Would the answer to question #1 change based on whether the products had the same technical names?
3. Given this load:
Flammable Liquid, n.o.s., 3, UN1993, PG I, Bulk
Are two 1993 markings required on the vehicle, or is only one 1993 marking required on the vehicle?
Combustible Liquid, n.o.s., Comb Liq, NA1993, PG III, Bulk
Thank you for your consideration.
Sincerely,
Russ Shanahan : .+
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