MAY/JUNE 2021 GasProcessingNews.com SPECIAL FOCUS: PIPELINES AND TRANSPORT 13 Use a seven-step procedure to mark piping CMLs A. Anwer and K. Alam 6 11 15 Evaluate ERW and SAW pipes for onshore buried gas pipelines S. Zardynezhad 21 Pipelines update: PHMSA regulations and the PIPES Act of 2020 W. Vandiver 35 TURBOMACHINERY 23 Introduction to oil bearing turboexpander rotor dynamics T. Avetian and L. E. RodrÃguez HEAT EXCHANGE 29 Improve gas-gas exchanger footprint and economics with a PSHE R. Broad and A. Bayati 9 DEPARTMENTS Gas Processing News .....................................................................................6 New in Gas Processing Technology ........................................................... 41 COLUMNS Editorial Comment .........................................................................................2 H2 blending into gas networks for " greener " methane Regional Focus ................................................................................................9 Africa's floating LNG sector looks to regain footing post-pandemic Industry Focus ................................................................................................ 11 EastMed pipeline faces technical challenges, competition Cover Image: Two overlapping ends of a pipe string are raised and cut on a pipe-lay ship before they are welded together for the Nord Stream 2 pipeline from Russia to Germany. Photo courtesy of Nord Stream 2 and Axel Schmidt. TREATING AND NGL 33 Energy savings for a propane refrigerant compressor using simulation H. Y. Noh LNG 35 Specifying trip valves is critical for LNG service P. Jessee BACK TO BASICS 37 Sulfur recovery for gas processing plants L. Micuccihttp://www.GasProcessingNews.com