Technology and Business Information for the Global Gas Processing Industry GasProcessingNews.com | MAY/JUNE 2021 PIPELINES AND TRANSPORT A seven-step procedure to mark piping CMLs Pipelines update: PHMSA regulations and the PIPES Act of 2020 TREATING AND NGL Energy savings for a propane refrigerant compressor using simulation TURBOMACHINERY Introduction to oil bearing turboexpander rotor dynamics Special Supplement tohttp://www.GasProcessingNews.com