API SPEC 19OH-2018 Openhole Isolation Equipment (First Edition) API TR 979-2018 Applications of Refractory Lining Materials (FIRST EDITION) API TR 980-2018 Monolithic Refractories_ Installation and Dryout (FIRST EDITION) API SPEC 6A-2018 Specification for Wellhead and Tree Equipment (TWENTY-FIRST EDITION; API Monogram p API SPEC 15PX-2018 Specification for Crosslinked Polyethylene (PEX) Line Pipe (First Edition) API RP 5EX-2018 Design, Verification, and Application of Solid Expandable Systems (FIRST EDITION) API TR 13TR3-2018 Size Measurement of Dry, Granular Drilling Fluid Particulates (FIRST EDITION) API RP 19G10-2018 Design and Operation of Intermittent Gas-lift Systems (FIRST EDITION)