Interpretation Response #98-0551 ([Worthington Cylinder Corporation] [Mr. Steven T. Gentry])

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

Interpretation Response Details

Response Publish Date: 04/15/1998

Company Name: Worthington Cylinder Corporation

Individual Name: Mr. Steven T. Gentry

Location State: OH Country: US

View the Interpretation Document

Response text:

APR 15, 1998

Mr. Steven T. Gentry
Worthington Cylinder Corporation
P.O. Box 391
1085 Dearborn Drive
Columbus, Ohio 43085

Dear Mr. Gentry:

This is in response to your inquiry requesting clarification of the testing requirements for DOT 4E specification cylinders. Your questions are paraphrased below, followed by our answers.

Ql: Are weld tensile specimens tested per 49 CFR § 178.68-17(a) (now § 178.68(1)(1) required to meet both apparent and actual breaking stress requirements?

Al : Yes. The specimen must meet both requirements to pass the test.

Q2: What are the minimum wall thickness requirements of 49 CFR 178.68-10 (now § 178.68(f)?

A2: The absolute minimum wall thickness is 0.140. In addition, the minimum wall thickness must be such that the calculated wall stress at twice the service pressure is less than 20,000 psi or 1/2 the minimum tensile strength, whichever is less. The minimum tensile strength is determined in accordance with § 178.680).

Q3: Where should the thickness of tensile coupons be measured?

A3: According to ASTME8, paragraph 7.1.1: "For referee testing of specimens under 3/16 in.
in their least dimension, measure the dimensions where the least cross-sectional area is found".

I hope this information is helpful. If we can be of further assistance, please contact us.

Sincerely,

Hattie L. Mitchell
Chief, Regulatory Review and Reinvention
Office of Hazardous Materials Standards

Regulation Sections