Standard operating procedure(s).
Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards
Source: Oil & Gas UK, Guidelines on subsea BOP systems, Issue 1, July 2012, Global Standards
Abbreviation for Standard Operating Procedures.
Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards