# National Tank Truck Carriers, Inc — Hazardous Materials Safety Interpretation

**Citation:** 00-0239  
**Type / status:** guidance / guidance  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 2000-09-11

00-0239 response to National Tank Truck Carriers, Inc concerning 180.416.

## Document text

<<<PAGE 1>>>

of Transportation
U.S. Department
Washington S. 20
Washington, D.C.
Research and
special Program:
Idministratior
SEP 1 1 2000
Mr. Clifford J. Harvison
Ref. No. 00-0239
President, National Tank Truck Carriers, Inc.
2200 Mill Road
Alexandria, VA 22314
Dear Mr. Harvison:
This responds to your letter, dated June 29, 2000, requesting clarification of the requirements of the
Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180) applicable to MC 330 and MC 331
cargo tanks. Your specific question relates to monthly inspections and tests of emergency discharge
control systems on cargo tanks.
Your understanding is correct. The monthly inspections and tests applicable to cargo tank emergency
discharge control systems, as specified in § 180.416(d) of the HMR, may be conducted at any suitable
location.
I hope this information is helpful. If you have further questions, please do not hesitate to contact this
office.
Sincerely,
Tho
omm
4. All.
Thomas G. Allan
Senior Transportation Regulations Specialist
Office of Hazardous Materials Standards
000239
180.416

<<<PAGE 2>>>

401078180.416 (d
NATIONAL TANK
HM-225
(Testina
Curao
NTTC
NATIONAL TANK TRUCK CARRIERS, INC.
Tank
TRUCK CARRIERS
THE
NATIONAL ORGA
TRY
Equip.
CLIFFORD J. HARVISON
PRESIDENT
2200 MILL ROAD • ALEXANDRIA, VA 22314-4677
PHONE: 703/838-1960 • FAX: 703/684-5753
00-239
June 29, 2000
General Engineer
Mr. Ron Kirkpatrick
OHMT
DHM-22.1
RSPA
United States Department of Transportation
Washington, DC 20590
Dear Mr. Kirkpatrick:
thought it was well-organized and productive.
Thank you for including yours truly in the Chicago meeting relative to the implementation of HM-225. I
the requirements of 49 CFR 180.416 (d). In summary, that regulation requires owners/operators of certain
More to the point, please consider this letter as a request for interpretation dealing with implementation of
MC 330/331 cargo tanks to perform "monthly inspections and tests" of the cargo tank's emergency
discharge control system"
facility, "CT" facility, etc.). Therefore, it is NTT's opinion that the relevant inspections and tests may be
Currently, the regulation does not specify a location at which the test must be performed (i.e. a carrie:
performed at any suitable location, so long as the inspections and tests comply with the rule, as written.
Would you please confirm NTT's "opinion" on this matter.
Thank you, in advance, for your cooperation.
Very truly yours,
..
T7A1
:
Cliftotal J. Harvison
President

## Provenance

- Official: Yes
- Source: <https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/2000/000239.pdf>
- Source ID: `phmsa`
- SHA-256: `7de3301e25c9c03f190268fcd1abbf9ccb89a0ea5b9f92a09e9a926511e0760e`
- Retrieved: 2026-08-20T00:59:31.977Z
- Exported: 2026-08-22T21:11:12.905Z
- Document slug: `phmsa-interpretation-00-0239`

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