Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
Quality Control
Definition(s)
Quality Control
Those physical activities that are conducted to check conformance with specifications in accordance with the quality assurance plan (e.g. NDE techniques, hold point inspections, material verifications, checking certification documents, etc.). Source: API 570, Piping Inspection Code: In-service Inspection, Rating, Repair, and Alteration of Piping Systems, Fourth Edition, February 2016, with Addendum May 2017. Global StandardsQuality Control
Those physical activities that are conducted to check conformance with specifications in accordance with the QA plan.
Source: API 510, Pressure Vessel Inspection Code: In-service Inspection, Rating, Repair, and Alteration, Tenth Edition, May 2014, with Addendum May 2017. Global StandardsQuality Control
Inspection, test or examination to ensure that materials, products or services conform to specified requirements. Source: API SPEC 17J, Specification for Unbonded Flexible Pipe, Third Edition, July 2008. Global StandardsQuality Control
The operational techniques and activities used to measure and regulate the quality of construction to the required level. Source: Rules and Regulations for the Classification of Mobile Offshore Units, Part 4, Steel Unit Structures, June 2013, Lloyd’s Register, Global StandardsQuality
Definition(s)
Quality
Conformance to specified requirements. Source: API SPEC 17J, Specification for Unbonded Flexible Pipe, Third Edition, July 2008. Global StandardsQuality
A relative judgement on whether the features and characteristics of something- such as a product, service, asset, activity or project- meet stated needs or requirements. Source: IOGP Report No. 510, Operating Management System Framework for controlling risk and delivering high performance in the oil and gas industry, International Association of Oil & Gas Producers, June 2014. Global StandardsPressure Armour Layer
Definition(s)
Pressure Armour Layer
Structural layer with a lay angle close to 90°, that increases the resistance of the flexible pipe to internal and external pressure and mechanical crushing loads; structurally supports the internal-pressure sheath; and typically consists of an interlocked metallic construction, which may be backed up by a flat metallic spiral layer. Source: API SPEC 17J, Specification for Unbonded Flexible Pipe, Third Edition, July 2008. Global StandardsPiggyback
Definition(s)
Piggyback
Two pipes attached at regular intervals with clamps, where either or both of the pipes can be flexible.. Source: API SPEC 17J, Specification for Unbonded Flexible Pipe, Third Edition, July 2008. Global StandardsOuter Sheath
Definition(s)
Outer Sheath
Polymer layer used to protect the pipe against penetration of seawater and other external environments, corrosion, abrasion and mechanical damage, and to keep the tensile armours in position after forming. Source: API SPEC 17J, Specification for Unbonded Flexible Pipe, Third Edition, July 2008. Global StandardsInternal Pressure Sheath
Definition(s)
Internal Pressure Sheath
Polymer layer that ensures internal-fluid integrity. NOTE This layer may consist of a number of sub-layers. Source: API SPEC 17J, Specification for Unbonded Flexible Pipe, Third Edition, July 2008. Global StandardsIntermediate Sheath
Definition(s)
Intermediate Sheath
Extruded polymer layer located between internal pressure and outer sheaths, which may be used as a barrier to external fluids in smooth bore pipes or as an anti-wear layer. Source: API SPEC 17J, Specification for Unbonded Flexible Pipe, Third Edition, July 2008. Global StandardsInsulation Layer
Definition(s)
Insulation Layer
Additional layer added to the flexible pipe to increase the thermal insulation properties, usually located between the outer tensile armour layer and the outer sheath. Source: API SPEC 17J, Specification for Unbonded Flexible Pipe, Third Edition, July 2008. Global StandardsFlexible Riser
Definition(s)
Flexible Riser
Flexible pipe connecting a platform/buoy/ship to a flowline, seafloor installation, or another platform where the riser may be freely suspended (free, catenary), restrained to some extent (buoys, chains), totally restrained or enclosed in a tube (I- or J-tubes). Source: API SPEC 17J, Specification for Unbonded Flexible Pipe, Third Edition, July 2008. Global StandardsFlexible Flowline
Definition(s)
Flexible Flowline
Flexible pipe, wholly or in part, resting on the seafloor or buried below the seafloor, and used in a static application. NOTE The term flowline is used in this document as a generic term for flexible flowlines. Source: API SPEC 17J, Specification for Unbonded Flexible Pipe, Third Edition, July 2008. Global StandardsFishscaling
Definition(s)
Fishscaling
Tendency of one tensile armour wire edge to lift off of the underlying layer because of deflection or incorrect twist deformation during armour winding. Source: API SPEC 17J, Specification for Unbonded Flexible Pipe, Third Edition, July 2008. Global StandardsDynamic Application
Definition(s)
Dynamic Application
Flexible pipe configuration that is subjected to loads that vary in time, or whose deflections or boundary conditions vary in time. Source: API SPEC 17J, Specification for Unbonded Flexible Pipe, Third Edition, July 2008. Global StandardsCrossover
Definition(s)
Crossover
Flexible flowline crossing another pipe already laid on the seabed. NOTE The underlying pipe may be a steel pipe or another flexible pipe. It may be required to support the overlying pipe to prevent overbending or crushing of the new or existing pipes. Source: API SPEC 17J, Specification for Unbonded Flexible Pipe, Third Edition, July 2008. Global StandardsCrossover
Tubular element with two different threaded connections.
Source:API SPECIFICATION 19TT, Specification for Downhole Well Test Tools and Related Equipment, First Edition, October 2016. Global Standards