API STD 2015-2018 Requirements for Safe Entry and Cleaning of Petroleum Storage Tanks (EIGHTH EDITIO API RP 1115-2018 Design and Operation of Solution-mined Salt Caverns Used for Liquid Hydrocarbon Sto API RP 934-E-2018 Recommended Practice for Materials and Fabrication of 1_Cr-_Mo Steel Pressure Vess API RP 505-2018 Recommended Practice for Classification of Locations for Electrical Installations at API RP 578-2018 Guidelines for a Material Verification Program (MVP) for New and Existing Assets (Th API RP 17L2 -2021 Recommended Practice for Ancillary Equipment for Flexible Pipes and Subsea Umbilic API RP 5EX-2018 Design, Verification, and Application of Solid Expandable Systems (FIRST EDITION) API 19C-2018 Measurement of and Specifications for Proppants Used in Hydraulic Fracturing and Gravel