You are here

Interpretation Response #12-0202

Below is the interpretation response detail and a list of regulations sections applicable to this response.

Interpretation Response Details

Response Publish Date: 10-18-2012
Company Name: NK CO., LTD    Individual Name: Mr. Hyun-Joon Ji
Country: KR

View the Interpretation Document

Response text:

October 18, 2012



Mr. Hyun-Joon Ji
Assistant Manager
Quality Inspection Team
497, Sinpyeong-dong, Saha-gu,
Busan 604-030, Korea

Ref. No.: 12-0202

Dear Mr. Ji:

This is in response to your September 10, 2012 email concerning the requirements for cylinders in accordance with the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180). Specifically you request confirmation of your understanding of the appropriate lot size for conducting the physical tests on DOT 3AA and DOT 3AAX cylinders.

As provided in § 178.37(k), a physical test must be conducted to determine the yield strength, tensile strength, elongation and reduction of area of material. The test is required on two specimens cut from one cylinder taken at random out of each lot of 200 or less. Alternatively, for lots of thirty or less, the physical tests are authorized to be made on a ring at least 8 inches (20 cm) long cut from one cylinder and subjected to the same heat treatment as the finished cylinder(s).

I hope this information is helpful. If you have further questions, please do not hesitate to contact this office.



Delmer Billings
Senior Regulatory Advisor
Standards and Rulemaking Division



Regulation Sections

Section Subject
§ 178.37 Specification 3AA and 3AAX seamless steel cylinders