[Code of Federal Regulations]

[Title 49, Volume 2]

[Revised as of October 1, 2005]

From the U.S. Government Printing Office via GPO Access

[CITE: 49CFR180.203]



[Page 1086-1087]

 

                        TITLE 49--TRANSPORTATION

 

   CHAPTER I--PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, 

                      DEPARTMENT OF TRANSPORTATION

 

PART 180_CONTINUING QUALIFICATION AND MAINTENANCE OF PACKAGINGS

--Table of Contents

 

        Subpart C_Qualification, Maintenance and Use of Cylinders

 

Sec. 180.203  Definitions.



    In addition to the definitions contained in Sec. 171.8 of this 

subchapter, the following definitions apply to this subpart:

    Commercially free of corrosive components means a hazardous material 

having a dew point at or below minus 46.7 [deg]C (minus 52 [deg]F) at 

101kPa (1 atmosphere) and free of components that will adversely react 

with the cylinder (e.g. chemical stress corrosion).

    Condemn means a determination that a cylinder is unserviceable for 

the continued transportation of hazardous materials in commerce and that 

the cylinder may not be restored by repair, rebuilding, requalification, 

or any other procedure.

    Defect means an imperfection requiring removal of a cylinder from 

service.

    Elastic expansion means a temporary increase in a cylinder's volume, 

due to application of pressure, that is lost when pressure is released 

(elastic expansion = total expansion minus permanent expansion).

    Filled or charged means an introduction or presence of a hazardous 

material in a cylinder.

    Non-corrosive service means a hazardous material that, in the 

presence of moisture, is not corrosive to the materials of construction 

of a cylinder (including valve, pressure relief device, etc.).

    Over-heated means a condition in which the temperature of any 

portion of an aluminum cylinder has reached 176 [deg]C (350 [deg]F) or 

higher, or in which the temperature of any portion of a steel or nickel 

cylinder has reached 343 [deg]C (650 [deg]F) or higher.



[[Page 1087]]



    Permanent expansion means a permanent increase in a cylinder's 

volume after the test pressure is released.

    Proof pressure test means a pressure test by interior pressurization 

without the determination of a cylinder's expansion.

    Rebuild means the replacement of a pressure part (e.g. a wall, head, 

or pressure fitting) by welding.

    Rejected cylinder means a cylinder that cannot be used for the 

transportation of a hazardous material in commerce without repair, 

rebuilding, and requalification.

    Repair means a procedure for correction of a rejected cylinder that 

may involve welding.

    Requalification means the completion of a visual inspection and/or 

the test(s) required to be performed on a cylinder to determine its 

suitability for continued service.

    Requalification identification number or RIN means a code assigned 

by DOT to uniquely identify a cylinder requalification, repair, or 

rebuilding facility.

    Test pressure means the pressure used for the requalification of a 

cylinder.

    Total expansion means the total increase in a cylinder's volume due 

to application of the test pressure.

    Visual inspection means an internal or external visual examination, 

or both, performed as part of the cylinder requalification process.

    Volumetric expansion test means a pressure test to determine the 

total and permanent expansion of a cylinder at a given pressure. The 

volumetric expansion test is conducted using the water jacket or direct 

expansion methods:

    (1) Water jacket method means a volumetric expansion test to 

determine a cylinder's total and permanent expansion by measuring the 

difference between the volume of water the cylinder externally displaces 

at test pressure and the volume of water the cylinder externally 

displaces at ambient pressure.

    (2) Direct expansion method means a volumetric expansion test to 

calculate a cylinder's total and permanent expansion by measuring the 

amount of water forced into a cylinder at test pressure, adjusted for 

the compressibility of water, as a means of determining the expansion.