Seamless pressure vessels (tubes) are designed per Department of Transportation (DOT) Specification 3AAX or 3 T. These tubes are used in over- the-road transport of high pressure gases. In tube trailer, these tubes are supported at ends from outside threaded necks. This paper describes the technical basis which was used in developing CGA C-23 document, which provides guideline on inspection and evaluation of tubes neck mounting surfaces. API-579/ASME FFS-1 standard and test data were used in developing the guideline for acceptance rejection criteria of the tube neck containing local thin areas and thread wear, respectively.

References

References
1.
CGA C-23
,
2012
,
Guidelines for the Inspection of Tube Neck Mounting Surfaces
,
1st ed.
,
Compressed Gas Association, Inc
.
Chantilly, VA
.
2.
API 579/ASME FFS-1
,
2007
,
Recommended Practice for Fitness–for–Service
,
2nd ed.
,
American Petroleum Institute
,
Washington D.C
.
3.
3AAX Specification, “
Hazardous Materials Regulations of the Department of Transportation
,”
49 Code of Federal Regulations
, Sections 178.37
U. S. Government Printing Office
,
Washington. DC
.
4.
3T Specification “
Hazardous Materials Regulations of the Department of Transportation
,”
49 Code of Federal Regulations
, Sections 178.45.
U. S. Government Printing Office
,
Washington. DC
.
5.
Screw Thread Standards for Federal Service—Section 2, 1991, Unified Inch Screw Threads—UN and UNR Forms, FED-STD-H28/2B, Federal Supply Services, General Services Administration, Washington, DC.
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