53 Description of Rules of Section XII Transport Tank Code
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Chapter 53, initially authored by Mahendra D. Rana, Stanley Staniszewski and Stephen V. Voorhees provide a Description of Rules of ASME Section XII covering Transport Tank Code of the 2004 edition. This chapter was revised by Mahendra D. Rana and Stanley Staniszewski to incorporate the latest Code changes in the 2007 edition. The first edition of ASME Section XII Transport Tank Code was published in July 2004. This newly developed Code provides rules for construction and continued service of pressure vessels used in transportation of dangerous goods via highway, rail, air or water. The authors provide an overview of Section XII while covering specific topics such as the scope and general requirements, materials and design, fabrication, inspection and testing requirements. The need for a pressure vessel code dealing with the whole spectrum of tanks to transport dangerous goods was a result of the review of USDOT (U.S. Department of Transportation) regulations. The regulations had become cumbersome to use, and in a global market without compromising safety the need to make the rules for transport tanks acceptable internationally became urgent. Hence the inaugural edition of ASME's Section XII focus was Portable Tanks. The subcommittee prepared the Code to be transparent with existing ASME Code requirements such as Section VIII, Div.1, while including the existing DOT requirements that impacted the scope of the charter to prepare the Section XII Code.
This chapter had been coordinated by Mahendra Rana with the help of experts covering topics in their respective fields. Stan Staniszewski dealt with the scope and general requirements of the Code including rules on pressure relief devices, stamping, marking certification, reports and records. The scope of the new Code applies to pressure vessels 450L and above, including additional components and criteria addressed in Modal Appendices that are to be used along with applicable regulations and laws. Steve Voorhees initially handled the sections on fabrication, inspection and testing requirements of Code Section XII. These sections have been further revised by Mahendra Rana to incorporate the 2007 Code changes. From the perspective of fabrication and inspection, Section XII is a mixture of familiar and new concepts to the Boiler and Pressure Vessel Code. Mahendra Rana covered the sections on materials and design rules. The coverage included Design Conditions and Allowable Stresses, Design Temperatures, Design and Allowable Working Pressures, Loadings, Design of Formed Heads, Torispherical Heads, External Pressure Design, Flat Heads and Covers, Openings and Reinforcements, Design of Welded Joints, and Articles covering Portable Cryogenic Tanks including Materials and Design. The rules for fatigue design are also given in the article covering Portable Cryogenic Tanks.