Z38010901This document is Addendum 1 to AGA Z380109, GPTC Guide for Gas Transmission and Distribution Piping Systems (ANSI Z380.1-2009), 2009 EditionAbout AGA Z380109:This guide contains the U.S. DOT Pipeline Safety Code Title 49-Part 191 and Part 192, plus guide material prepared by the Gas Piping Technology Committee accredited by the American National Standards Institute (ANSI). The guide is continuously updated by the GPTC which issues addenda on a periodic basis. These addendums will include new or revised guide material, as well as updates to Parts 191 and 192. Purchasers of the 2009 edition will automatically receive notification of the availability of the addendums, which will be made available in hard copy and downloadable formats.