Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
Yarn Assembly Checklist
Definition(s)
Yarn Assembly Checklist
A document completed during the yarn assembly process which states the nominal values and records the actual values for each set-up of each step of the process of the yarn. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global StandardsYarn Break Strength
Definition(s)
Yarn Break Strength
The average breaking load from several yarn break tests. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global StandardsYarn Creep
Definition(s)
Yarn Creep
The characteristics of the yarn that undergo a time related non-recoverable increase in length when subjected to sustained load. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global StandardsYarn Elongation
Definition(s)
Yarn Elongation
The average elongation at break from several yarn break tests. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global StandardsYarn Producer
Definition(s)
Yarn Producer
The entity which produces the fiber and/or yarn and applies special processes to that yarn before it is received by the rope manufacturer. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global StandardsYarn-on-yarn Abrasion Property
Definition(s)
Yarn-on-yarn Abrasion Property
The average cycles to failure at a designated applied load which the yarn exhibits when tested by the yarn-on-yarn abrasion test method. Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global StandardsYear
Definition(s)
Year
Year has the same meaning as in the Regulatory Levies Act. Source: Offshore Petroleum and Greenhouse Gas Storage Act 2006, Australia, amended 2012. LegislationYear of the Term
Definition(s)
Year of the term
Year of the term is defined in section 10 of the Act. A year of the term of a title commences on the day that the title comes into force or on any anniversary of that day. Source: Offshore Petroleum and Greenhouse Gas Storage (Resource Management and Administration) Regulations 2011 (Select Legislative Instrument 2011 No. 54 as amended), Australia, prepared on 1 January 2012. RegulationsYield
Definition(s)
Yield
Permanent, inelastic deformation. Source: API TR 5C3, Technical Report on Equations and Calculations for Casing, Tubing, and Line Pipe Used as Casing or Tubing; and Performance Properties Tables for Casing and Tubing, Upstream Segment, First Edition, December 2008. Global StandardsYield Capacity
Definition(s)
Yield Capacity
Maximum load(s) of the connector that cause the primary membrane stress to reach the specified minimum yield stress.
Source: API Technical Report 17TR7, Verification and Validation of Subsea Connectors, First Edition, April 2017. Global StandardsYield Strength
Definition(s)
Yield strength
Stress level, measured at room temperature, at which material plastically deforms and will not return to its original dimensions when the stress is released.- NOTE: 1 The term is expressed in Newton’s per square millimeter (pounds per square inch) of loaded area.
- NOTE: 2 All yield strength (YS) specified in this standard are considered as being the 0.2 % yield offset strength in accordance with ISO 6892 or ASTM A370.
Yield strength
Stress level, measured at room temperature, at which material plastically deforms and will not return to its original dimensions when the stress is released.- NOTE: 1 The term is expressed in newtons per square millimeter (pounds per square inch) of loaded area.
- NOTE: 2 All yield strengths specified in this standard are considered as being the 0.2 % yield offset strength in accordance with ISO 6892 or ASTM A370.
Yield strength
Material specification corresponding to measured tensile stress required to produce a total elongation of 0.5 % of test specimen gauge length. Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global StandardsYield strength
Stress level, measured at room temperature, at which material plastically deforms and does not return to its original dimensions when the load is released.- NOTE: All yield strengths specified in this document are the 0,2 % offset yield strength in accordance with ISO 6892-1 or ASTM A370.
Yield strength
Stress level, measured at room temperature, at which material plastically deforms and will not return to its original dimensions when the stress is released.- NOTE: 1 It is expressed in newtons per square millimetre (pounds per square inch) of loaded area.
- NOTE: 2 All yield strengths specified in this American National Standard are considered as being the 0,2 % yield offset strength in accordance with ISO 6892.
Yield strength
The stress level measured at room temperature, expressed in pounds per square inch of loaded area, at which material plastically deforms and will not return to its original dimensions when the load is released. Yield strengths specified in this standard shall be considered as being the 0.2% yield offset strength per ASTM A 370. Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global StandardsYield strength
The stress level measured at room temperature, expressed in pounds per square in. of loaded area, at which material plastically deforms and will not return to its original dimensions when the load is released. All yield strengths specified in this standard shall be considered as being the 0.2% yield offset strength per ASTM A 370. Source: API SPEC 16RCD, Specification for Drill Through Equipment—Rotating Control Devices, Upstream Segment, First Edition, February 2005. Global StandardsYield strength
Stress level at which a metal or other material ceases to behave elastically. Source: API SPEC 17J, Specification for Unbonded Flexible Pipe, Third Edition, July 2008. Global StandardsYield strength
Engineering stress at which, by convention, it is considered that plastic elongation of the material has commenced (ASTM E6). NOTE This stress may be specified in terms of: a) a specified deviation from a linear stress–strain relationship, b) a specified total extension attained, or c) maximum or minimum engineering stresses measured during discontinuous yielding. EXAMPLE In API 6A, yield strength values are the 0.2 % offset yield strengths determined from tests conducted in accordance with ASTM A370. In API 5CT, the stress occurs at specified strains (0.5 %, 0.65 %, etc.). Source: API TR 1PER15K-1, Protocol for Verification and Validation of High-pressure High-temperature Equipment, First Edition, March 2013. Global StandardsYield Stress Bias
Definition(s)
Yield Stress Bias
Ratio of actual yield stress to specified minimum yield stress. Source: API TR 5C3, Technical Report on Equations and Calculations for Casing, Tubing, and Line Pipe Used as Casing or Tubing; and Performance Properties Tables for Casing and Tubing, Upstream Segment, First Edition, December 2008. Global StandardsYielding
Definition(s)
Yielding
The permanent deformation of the steel walls of a line or vessel caused when the MOP is exceeded. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsYoke
Definition(s)
Yoke
U-shaped piece of soft magnetic material, either solid or laminated, around which a coil is wound to carry a magnetizing current. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsYoke Magnetization
Definition(s)
Yoke Magnetization
Magnetic field induced in OCTG, or in an area of a OCTG, by means of an external electromagnet shaped like a yoke. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsYou
Definition(s)
You:
You means a lessee, the owner or holder of operating rights, a designated operator or agent of the lessee(s), a pipeline right-of-way holder, or a State lessee granted a right-of-use and easement. You or your — the lessee or the operator or other lessees' representative engaged in operations in the Outer Continental Shelf (OCS). I or you means the lessee engaged in oil, gas, or sulphur operations in the Outer Continental Shelf (OCS). Source: Oil and Gas and Sulphur Operations in the Outer Continental Shelf, 30 CFR 250 (2013). RegulationsYour
Definition(s)
Your:
You or your — the lessee or the operator or other lessees' representative engaged in operations in the Outer Continental Shelf (OCS). Source: Oil and Gas and Sulphur Operations in the Outer Continental Shelf, 30 CFR 250 (2013). RegulationsYr
Definition(s)
Yr
Year. Source: API SPEC 17F, Specification for Subsea Production Control Systems, Second Edition, December 2006 (Reaffirmed April 2011). Global StandardsYS
Definition(s)
YS
Yield strength.Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global Standards
YS
Stress level, measured at room temperature, at which material plastically deforms and will not return to its original dimensions when the stress is released.- NOTE: 1 The term is expressed in Newton’s per square millimeter (pounds per square inch) of loaded area.
- NOTE: 2 All yield strength (YS) specified in this standard are considered as being the 0.2 % yield offset strength in accordance with ISO 6892 or ASTM A370.
Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global Standards