Definition(s)
Essential Variable
Variable parameter in which a change affects the mechanical properties of the weld joint.
Source: API SPEC 5DP, Specification for Drill Pipe, First Edition, August 2009. Global Standards
Oil & Gas Drilling Glossary - IADCLexicon.org
Variable parameter in which a change affects the mechanical properties of the weld joint.
Source: API SPEC 5DP, Specification for Drill Pipe, First Edition, August 2009. Global Standards