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 #PI-86-003 ([Florida Power & Light Company] [John M. Stokes])

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

Interpretation Response Details

Response Publish Date:

Company Name: Florida Power & Light Company

Individual Name: John M. Stokes

Location State: FL Country: US

View the Interpretation Document

Response text:

Mr. John M. Stokes

Supervisor, Oil & Gas

Florida Power & Light Company

P.O. Box 029100

Miami, Florida 33102

Dear Mr. Stokes:

In response to your letter of March 24, 1986, to Mr. Cesar DeLeon, Chief, Southern Region, Office of Pipeline Safety, we have reviewed your request for waiver from §192.503(b)(3). This section requires that a hydrostatic test of a natural gas pipeline must be done with a medium that is "Except for natural gas, nonflammable."

Your waiver request states that the intended test medium is No. 6 residual fuel oil having a minimum flash point of 150°F.

In defining the word "nonflammable" we rely upon the definition of "flammable" in 49 CFR Part 173 - Shippers - General Requirements for Shipments and Packagings §173.115(a) Flammable, combustible, and pyrophoric liquids; definitions. This section of the Hazardous Materials regulations defines flammable liquid as follows:

§173.115 Flammable, combustible, and pyrophoric liquids; definitions. (a) Flammable liquid. (1) For the purposes of this subchapter a flammable liquid means any liquid having a flash point below 100°F. (37.8°C.), with the following exceptions:

  1. Any liquid meeting one of the definitions specified in §173.300;
  2. Any mixture having one component or more with a flash point of 100°F., (37.8 °C.) or higher, that makes up at least 99 percent of the total volume of the mixture;
  3. For the purpose of this subchapter, a distilled spirit of 140 proof or lower is considered to have a flash point no lower than 73°F.

As a result, the No.6 fuel oil proposed for the hydrostatic test medium, which has a flash point well above 100°F, is not considered flammable under the meaning of §192.503(b)(3) and may be used, for hydrotesting under this section without waiver.

It is our understanding that Mr. DeLeon informed you of this decision by telephone on April 16, 1986. This letter is intended to confirm that call.

Thank you for your interest in pipeline safety.


Robert L. Paullin


Pipeline Safety Regulation

Regulation Sections

Section Subject
192.503 General requirements