Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
L+T
Definition(s)
L+T
Longitudinal plus transverse. Source: API SPEC 5CRA, Specification for Corrosion Resistant Alloy Seamless Tubes for Use as Casing, Tubing and Coupling Stock, Upstream Segment, First Edition, February 2010 (Errata August 2011). Global StandardsL-C
Definition(s)
L-C
Longitudinally oriented specimen with a circumferential flaw. Source: API Technical Report 17TR7, Verification and Validation of Subsea Connectors, First Edition, April 2017. Global StandardsL.E.L.
Definition(s)
L.E.L.
L.E.L.—Lower explosive limit. Source: Oil and Gas Wells, Pennsylvania Code, Title 25, Chapter 78, December 2012. RegulationsLabel 1
Definition(s)
Label 1
Dimensionless designation for the size or specified outside diameter, used when ordering OCTG. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsLabel 1
Dimensionless designation for the size or specified outside diameter that may be used when ordering pipe. Source: API SPEC 5CRA, Specification for Corrosion Resistant Alloy Seamless Tubes for Use as Casing, Tubing and Coupling Stock, Upstream Segment, First Edition, February 2010 (Errata August 2011). Global Standards Source: API SPEC 5CT, Specification for Casing and Tubing, Upstream Segment, Ninth Edition, July 2011 (Errata September 2012). Global StandardsLabel 1
Dimensionless designation for the drill-pipe-body size that may be used when ordering. Source: API SPEC 5DP, Specification for Drill Pipe, First Edition, August 2009. Global StandardsLabel 1
Dimensionless designation for the size or specified outside diameter that may be used when ordering pipe. 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 StandardsLabel 2
Definition(s)
Label 2
Dimensionless designation for the mass per unit length or wall thickness, used when ordering OCTG. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsLabel 2
Dimensionless designation for the linear density that may be used when ordering pipe. NOTE Linear density is sometimes designated by the deprecated term “mass per unit length”. Source: API SPEC 5CRA, Specification for Corrosion Resistant Alloy Seamless Tubes for Use as Casing, Tubing and Coupling Stock, Upstream Segment, First Edition, February 2010 (Errata August 2011). Global StandardsLabel 2
Dimensionless designation for the mass per unit length or wall thickness that may be used when ordering pipe. Source: API SPEC 5CT, Specification for Casing and Tubing, Upstream Segment, Ninth Edition, July 2011 (Errata September 2012). Global Standards 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 StandardsLabel 2
Dimensionless designation for the drill-pipe-body mass per unit length that may be used when ordering. Source: API SPEC 5DP, Specification for Drill Pipe, First Edition, August 2009. Global StandardsLabeled
Definition(s)
Labeled
Equipment or materials with a label, symbol, or other identifying mark of an organization that is acceptable to the authority having jurisdiction and concerned with product evaluation that maintains periodic inspection of production of labeled equipment or materials and by whose labeling the manufacturer indicates compliance with appropriate standards or performance in a specified manner.- NOTE: Some testing agencies use the term approved, listed, or certified to indicate compliance with the applicable standard.
Laboratory recognized by the Administration
Definition(s)
Laboratory Recognized by the Administration
Laboratory recognized by the Administration means a testing laboratory which is acceptable to the Administration concerned. Other testing laboratories may be recognized on a case-by-case basis for specific approvals as agreed upon by the Administration concerned. Source: IMO Resolution MSC.307(88), International Code for Application of Fire Test Procedures, 2010 (2010 FTP Code), 3 December 2010, International Maritime Organization. Regulatory GuidanceLACT
Definition(s)
LACT
LACT (“Lease Automated Custody Transfer” ) shall mean the transfer of produced crude oil or condensate, after processing or treating in the producing operations, from storage vessels or automated transfer facilities to pipelines or any other form of transportation. Source: Oil and Gas Conservation Commission, Practice and Procedure, Code of Colorado Regulations, 2 CCR 404-1, February 2013. RegulationsLadder Climbing Assist Device (Angel Lift)
Definition(s)
Ladder Climbing Assist Device (Angel Lift)
A device consisting of a length of wire rope reeved over a sheave, with one end attached to a counterweight and the other end attached to a belt that passes under a person's buttocks. As a person ascends or descends the mast ladder, the device acts as an assist by lightening the person's weight. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. RegulationsLadder Offset Platform
Definition(s)
Ladder Offset Platform
A platform installed on the derrick or mast at points where the ladder is offset to provide access from one ladder section to an adjacent offset section. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. RegulationsLAeq,8h
Definition(s)
LAeq,8h
An averaged 8-hr equivalent continuous A-weighted sound pressure level, measured in dB(A), referenced to 20 micro Pascals in air. LAeq,8h must be determined in accordance with AS/NZS 1269 (NOHSC 1007). Source: NOPSEMA Guidance Note: Noise Management—Principles of Assessment and Control, N-09000-GN0401, Australia, Revision 3, December 2011. Regulatory GuidanceLaminae
Definition(s)
Laminae
Thin sheet of reinforcing fibres in a resin matrix built up into a flat or curved arrangement.Source: ISO 14692-1:2017, Petroleum and natural gas industries — Glass-reinforced plastics (GRP) piping — Part 1: Vocabulary, symbols, applications and materials, Second Edition, August 2017. Global Standards
Laminar Flow
Definition(s)
Laminar Flow
Fluid flow where fluid layers at the center of the line or vessel move faster than the layers next to the pipe wall. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsLaminate
Definition(s)
Laminate
Unite laminae with a bonding material, usually using pressure and heat.- Note: 1 to entry: Normally used with reference to flat sheets, but can also refer to tubes. A product made by such bonding is referred to as a laminate.
Laminated Joint
Definition(s)
Laminated Joint
Joint consisting of plain-ended pipe and fittings laminated together with reinforcing fibres and resin/hardener mixture. Source: ISO 14692-1:2017, Petroleum and natural gas industries — Glass-reinforced plastics (GRP) piping — Part 1: Vocabulary, symbols, applications and materials, Second Edition, August 2017. Global StandardsLamp
Definition(s)
Lamp
Lamp means a source producing light, including incandescent sources, Light Emitting Diodes (LED) and other non-incandescent sources. Source: IMO Resolution MSC.253(83), Recommendation on Performance Standards for Navigation Lights, Navigation Light Controllers and associated equipment, 8 October 2007, International Maritime Organization. Regulatory GuidanceLAN
Definition(s)
LAN
Local Area Network Source: ANSI/ISA–99.00.01–2007, Security for Industrial Automation and Control Systems, Part 1: Terminology, Concepts, and Models, 29 October 2007. National StandardLand Application
Definition(s)
Land Application
"Land application" is the application of deleterious substances and/or soils contaminated by deleterious substances to the land for the purpose of disposal or land treatment; also known as soil farming. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsLand Application
LAND APPLICATION shall mean the disposal method by which E&P waste is spread upon or sometimes mixed into soils. Source: Oil and Gas Conservation Commission, Practice and Procedure, Code of Colorado Regulations, 2 CCR 404-1, February 2013. RegulationsLand Disposal
Definition(s)
Land Disposal
The placement in or on the land, except as otherwise provided in 40 CFR, Part 268, including placement in a landfill, surface impoundment, waste pile, injection well, land treatment facility, salt dome formation, salt bed formation, or underground mine or cave, or placement in a concrete vault or bunker intended for disposal purposes. Source: Oil and Gas Division, Texas Administrative Code, Title 16, Chapter 3, February 2013. RegulationsLand Take
Definition(s)
Land Take
The area of land that is ‘taken’ by infrastructure itself and other facilities that necessarily go along with the infrastructure, such as filling stations on roads and railway stations. (European Commission) Source: Identifying and assessing water sources: Guidance document for the onshore oil and gas industry, International Petroleum Industry Environmental Conservation Association (IPIECA), 2014. Global StandardsLand Treatment
Definition(s)
Land Treatment
Land Treatment―a dynamic process involving the controlled application of E and P Waste onto or into the aerobic surface soil horizon in open cells by a commercial land treatment facility, accompanied by continued monitoring and management, to alter the physical, chemical, and biological state of the E and P Waste. Site, soil, climate, and biological activity interact as a system to degrade and immobilize E and P Waste constituents thereby rendering the area suitable for the support of vegetative growth and providing for beneficial future land use or to meet the reuse criteria of §565. Source: Natural Resources, Office of Conservation – General Operations, Louisiana Administrative Code, Title 43, Part XIX, March 2013. RegulationsLand Treatment
LAND TREATMENT shall mean the treatment method by which E&P waste is applied to soils and treated to result in a reduction of hydrocarbon concentration by biodegradation and other natural attenuation processes. Land treatment may be enhanced by tilling, disking, aerating, composting and the addition of nutrients or microbes. Source: Oil and Gas Conservation Commission, Practice and Procedure, Code of Colorado Regulations, 2 CCR 404-1, February 2013. RegulationsLand-based Testing
Definition(s)
Land-based Testing
Land-based Testing is a test of the BWMS carried out in a laboratory, equipment factory or pilot plant including a moored test barge or test ship, according to Parts 2 and 3 of the annex to these Guidelines, to confirm that the BWMS meets the standards set by regulation D-2 of the Convention. Source: Resolution MEPC.174(58), revised Guidelines for approval of ballast water management systems (G8), 10 October 2008, International Maritime Organization. Regulatory GuidanceLand-Use Plan
Definition(s)
Land-Use Plan
Overview showing planned placement location of equipment and installations, access routes, internal traffic patterns and enclosures. Source: Regulations Relating to Technical and Operational Matters at Onshore Facilities in the Petroleum Activities, etc. (The Technical and Operational Regulations) Norway, April 2010 (amended December 2010). RegulationsLandfarming
Definition(s)
Landfarming
A waste management practice in which oil and gas wastes are mixed with or applied to the land surface in such a manner that the waste will not migrate off the landfarmed area. Source: Oil and Gas Division, Texas Administrative Code, Title 16, Chapter 3, February 2013. RegulationsLanding and Transfer Coordinator
Definition(s)
Landing and Transfer Coordinator
Person in charge of the engineered personnel transferring operation, ensures that all aspects of the personnel transferring operation are according to the DNV GL approved personnel transfer procedure, shall possess a thorough knowledge and have experience with the actual operation live load (LL) for marking purposes, it shall represent allowable number of persons on the gangway at one moment.Source: Offshore Gangways, DNVGL-ST-0358, DNV GL, September 2017. Global Standards
Landing Joint
Definition(s)
Landing Joint
Riser joint installed temporarily above the telescopic joint and used to land the BOP stack on the wellhead.
Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards