The purchaser or renter of the equipment to be installed on the wellhead. NOTE: In most cases this is the drilling contractor.
Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards
Owner of the equipment repaired or remanufactured in conformance with this document.
Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global Standards