USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Interpretation Response #00-0010 ([Sumter Transport] [Mr. Scott W. Rumph])

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

Interpretation Response Details

Response Publish Date:

Company Name: Sumter Transport

Individual Name: Mr. Scott W. Rumph

Location State: SC Country: US

View the Interpretation Document

Response text:

January 27, 2000

Mr. Scott W. Rumph                 Ref No. 00-0010
Sumter Transport
170 South Lafayette Drive
Sumter, South Carolina 29150

Dear Mr. Rumph:

This responds to your letter, dated October 29, 1999, concerning cargo tank specification requirements in the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180).  Specifically, you ask about a design modification to MC 307, MC 312, DOT 407, and DOT 412 specification cargo tanks to equip them with an internal agitation system driven by a power source located outside the cargo tank.

Your letter suggests that you are considering manufacturing new cargo tanks equipped with the internal agitation system rather than modifying existing cargo tanks.  You should be aware that MC 307 and MC 312 specification cargo tanks have not been authorized for new construction since August 31, 1995 (see § 180.405(b)).

The design and construction requirements for DOT 407 and DOT 412 specification cargo tanks are in § 178.345 of the HMR.  The regulations do not prohibit a design of the type you describe.  Each cargo tank motor vehicle design type must be approved by a Design Certifying Engineer (see § 178.320(b)). In addition, each finished cargo tank motor vehicle must be inspected by an Authorized Inspector or a Registered Inspector, as applicable (see § 178.345-1 (e)).

Generally, MC 307, MC 312, DOT 407, and DOT 412 specification cargo tanks are authorized for bulk shipments of flammable liquids, including waste flammable liquids.  Packaging requirements for bulk quantities of a specific hazardous material can be found in column 88 of the Hazardous Materials Table in § 172.101 of the HMR.  You should consult the section of the HMR referenced in column 88 for the specific hazardous material you are transporting for the packagings authorized for transportation and any special requirements that also apply.

Additional requirements for transporting bulk quantities of hazardous materials are in Part 173, Subpart B - Preparation of Hazardous Materials for Transportation.

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


Thomas G. Allan
Senior Transportation Regulations Specialist
Office of Hazardous Materials Standards


Regulation Sections

Section Subject
178.345 General design and construction requirements applicable to Specification DOT 406 (178.346), DOT 407 (178.347), and DOT 412 (178.348) cargo tank motor vehicles