Interpretation Response #05-0199 ([Mr. Ed Mansell])
Below is the interpretation response detail and a list of regulations sections applicable to this response.
Interpretation Response Details
Response Publish Date:
Company Name:
Individual Name: Mr. Ed Mansell
Location State: OH Country: US
View the Interpretation Document
Response text:
Nov 3, 2005
Mr. Ed Mansell Reference No. 05-0199
P.O. Box 310
4825 E. Kearney
Springfield, OH 65801
Dear Mr. Mansell:
This is in response to your August 18, 2005 letter requesting clarification of the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180) applicable to structural integrity of cargo tanks. Specifically, you ask whether the following allowable stress for stress concentrations are acceptable under the structural requirements for cargo tanks under § 178.345-3 of the HMR:
| Primary Stress Allowable: | 1.5xSa*E, where Sa is the 1998 ASME Code allowable stress, and B is the joint efficiency; and |
| Primary + Secondary Stress Allowable: | 3xSa*E, where Sa is the 1998 ASME Code allowable stress, and B is the joint efficiency. |
Section 178.345-3(b) specifically requires cargo tank designers to use Appendix G of the American Society of Mechanical Engineers (ASME) Code when considering stress concentrations which occur at pads, cradles, or other supports. Provided the stress concentrations occur at pads, cradles, or other supports, Appendix G of the ASME Code is mandatory when considering designing DOT specification cargo tanks.
I hope this information is helpful.
Sincerely,
Susan Gorsky
Acting Director
Office of Hazardous Materials Standards
178.345-3
Regulation Sections
| Section | Subject |
|---|---|
| 178.345-3 | Structural integrity |