# Taylor-Wharton — Hazardous Materials Safety Interpretation

**Citation:** 00-0046  
**Type / status:** guidance / guidance  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 2000-03-24

00-0046 response to Taylor-Wharton concerning 178.57.

## Document text

<<<PAGE 1>>>

US. Department
of Transportation
400 Seventh Street, S.W.
Washington, D.C.
20590
Research and
Administration
special Program:
MAR 2 4 2000
Mr. Glenn Curtis
Taylor-Wharton
Ref. No: 00-0046
4075 Hamilton Blvd.
Theodore, AL 36582
Dear Mr. Curtis:
This is in response to your February 7, 2000, letter requesting clarification of the term "lot" as it
pertains to DOT specification 4L welded cylinders under the Hazardous Materials Regulations
(HMR; 49 CFR Parts 171-180). Your questions are paraphrased and answered as follows:
Q. We manufacture different cylinder models that are identical in all respects, except for a 7%-8%
volumetric capacity due to a difference in shell length. May the two models be considered a "lot"
provided their combined quantity doesn't exceed 200?
A. No. A "lot" is considered to be cylinders of the same size that are successively produced in the
same shift (see § 178.65(f). Although $ 178.65 pertains to DOT Specification 39 cylinders, "lot"
has the same meaning throughout the HMR. This will be clarified in a future rulemaking action.
Q. Due to a delay we interrupt manufacturing of a lot of cylinders. At some later time we resume
production using the same heats of materials, designs, equipment, and process. Are all cylinders
manufactured both before and after the interruption considered as one "lot" in relation to the testing
requirements of § 178.57(1)(1)(2) or (3)?
A. No, for the same reasons.
I hope this information is helpful.
Sincerely,
When th things,
Delmer F. Billings
Chief, Standards Development
Office of Hazardous Materials Standards
000046
178.57

<<<PAGE 2>>>

) TAYLOR-WHARTON
4075 Hamilton Blvd
Corpse Controlid
Theodore, AL 36582 USA
corporation Control Group
Facsimile (334) 443-2251
Telephone (334) 443-8680
February 7, 2000
Lavalle
$178.57
RSPA Office of Hazardous Materials Standards (DHM 10)
U.S. Department of Transportation
00 - 0046
400 Seventh Street, SW.
Washington, DC 20590-0001
Re: Interpretation Request
To Whom It May Concern:
In a review of our manufacturing operation, discussions emerged prompting us to seek your
interpretation for a couple of issues concerning "a lot" as it relates to 49CFR178.57, Specification 4L
Welded Insulated Cylinders.
• Assume we manufacture, back to back, different cylinder models that are identical in all
respects, except for a 7%-8% volumetric capacity difference resulting from a different shell
length. Are we correct, in our determination that the 2 models could be considered "a lot"
provided their combined quantity doesn't exceed 200?
• Assume, because of time constraint or another extraneous delay, we interrupt manufacturing
of a lot of cylinders, and at some later time, resume production using the same heats of
materials, designs, equipment, and process. Are we correct in our determination that all the
cylinders manufactured both before and after the interruption can be considered as 1 lot in
relation to the testing requirements of 49CFR178.57, (I), (1), & (2) or (3)?
I'm looking forward to your response.
I can be reached at 334-443-2205 between the hours of 7:00 AM and 4:00 PM, Central Daylight
Savings Time.
Respectfully,
Rem Quitin
Glenn Curtis
Quality Assurance Manager
-

## Provenance

- Official: Yes
- Source: <https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/2000/000046.pdf>
- Source ID: `phmsa`
- SHA-256: `cb1652cd7b6cd2149e11193dc74088abcfc6bb788be5f8262e5e09ee8a9c389f`
- Retrieved: 2026-08-20T00:59:31.977Z
- Exported: 2026-08-22T05:52:09.936Z
- Document slug: `phmsa-interpretation-00-0046`

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