DRILLBITS
Monthly eNewsletter from the IADC


IADC Lexicon Featured Term for May 2020

The IADC Lexicon is an oil and gas dictionary of upstream-related terms, which, unlike conventional glossaries, are official definitions drawn from legislation, regulation and regulatory guidance, standards (global, national and regional), IADC guidelines, and Well Control Institute. Terms often have multiple definitions from different sources.

This month’s Featured Term is:

Commanded Closure” ( Source: IAPI SPEC 17F, Specification for Subsea Production Control Systems, Second Edition, December 2006 (Reaffirmed April 2011):

Closure of the underwater safety valve and possibly other valves depending on the control system design. NOTE Such commands can originate manually, automatically or as part of an ESD.