AGA Z380115
Guide for Gas Transmission, Distribution, and Gathering Piping Systems, 2015 Edition (ANSI Z380.1-2015). Includes Addendum 1 (2015), 2 (2015), 3 (2016), 4 (2016), 5 (2016), 6 (2017), 7 (2017), 8 (2017), and 9 (2018)
standard by American Gas Association, 2015