Publication

C-29: Standard for Design Requirements for Tube Trailers, Tube Modules, and Multiple Element Gas Containers Utilizing Metallic and Nonmetallic Pressure Vessels

Abstract

This standard defines basic design requirements for tube trailers, tube modules, and multiple element gas containers (MEGCs) carrying Type I, Type II, Type III, or Type IV pressure vessels, to maintain structural integrity during normal conditions of handling and transport. A tube trailer or tube module manufactured in accordance with the standard is less likely to have a separation of the tubes from the trailer or bundle or an unintentional release of product when subjected to the multidirectional forces that can occur in a highway collision including a rollover accident. Tube modules shall meet the loading and accident protection standards that are applied to tube trailers.

This standard covers units under the jurisdiction of the Hazardous Material Regulations or under Special Permit issued by the U.S. Department of Transportation’s Pipeline and Hazardous Materials Safety Administration (PHMSA), and units under the jurisdiction of The Transport of Dangerous Goods (TDG) Act or under Equivalency Certificate issued by Transport Canada.

This standard does not address MEGCs carrying United Nations (UN) cylinders. The design requirements for a MEGC are found in Title 49 of the U.S. Code of Federal Regulations (49 CFR) Part 178.75.

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Properties

Edition:
2
Published:
July 2026
Status:
Available To the Public
Size:
8 pages
Publisher:
CGA
Special Attributes:
Notes:
Committee:
Cylinder Specifications

Cataloging

Category
Cylinders     Standards & Guidelines
Keywords
MEGC  |  tube  |  tube module  |  tube trailer connections  |  tube trailers
Related
C-23  |  C-31  |  P-74  |  S-1.1  |  V-10