R

R

Definition(s)

R

Radius of the circular footing.

Source: ABS Guidance Notes on Geotechnical Performance of Spudcan Foundations, January 2017. Global Standards  

r

Shear strength ratio.

Source: ABS Guidance Notes on Geotechnical Performance of Spudcan Foundations, January 2017. Global Standards
R-ratio

R-ratio

Definition(s)

R-ratio

ratio of the hoop stress to the axial stress in a particular test condition
  • EXAMPLE: In a hydrostatic test condition where a) the test sample is unrestrained, b) the hoop stress component is represented by half the pressure times diameter divided by wall thickness (PD/2t) and c) the axial stress component is represented by one-fourth the pressure times diameter divided by wall thickness (PD/4t), the R-ratio would be exactly 2,0. In the same test condition, if the axial stress component is represented by force over area (F/A) instead of PD/4t, the R-ratio will most likely be slightly higher than 2,0.
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
R/Min

R/Min

Definition(s)

R/Min

Revolutions per minute. Source: API RP 5C5, Recommended Practice on Procedures for Testing Casing and Tubing Connections, Third Edition, July 2003 (Reaffirmed August 2010). Global Standards  
R/T

R/T

Definition(s)

R/T

Radio Telephony. Source: NOGEPA Guideline 14, Helideck Operations and Procedures Manual, Netherlands, Version 2, December 2011. Global Standards
RA

RA

Definition(s)

Ra

Surface finish Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards  

Ra

Measurement of the average roughness of a surface. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards

RA

Component of a JSA, where a determination of the expected level (severity) of illness, injury, and/or property damage that an identified hazard can cause is coupled with the frequency (probability) of that level of hazard occurring.
  • NOTE: 1 This is then plotted on a matrix to determine the level of risk associated with that job.
  • NOTE: 2 If the level of risk is not acceptable, control measures are introduced to reduce the risk to an acceptable level.
Source: API STD 689, Collection and Exchange of Reliability and Maintenance Data for Equipment, First Edition, July 2007. Global Standards  

RA

Risk assessment. Source: API RP 98, Personal Protective Equipment Selection for Oil Spill Responders, First Edition, August 2013. Global Standards

RA

Reliability and availability. Source: API STD 689, Collection and Exchange of Reliability and Maintenance Data for Equipment, First Edition, July 2007. Global Standards
Ra

Ra

Definition(s)

Ra

Radium. Source: NOGEPA Industrial Guideline No. 16, Working with Naturally Occurring Radioactive Materials (NORM), Netherlands, Version 1, January 2009. Global Standards
Rabbit

Rabbit

Definition(s)

Rabbit

An instrument or device that is dropped, pulled, or pushed through a section of pipe to ensure that it is free of obstruction. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards  
RACI

RACI

Definition(s)

RACI

Responsible, Accountable, Consulted, Informed. Source: ISO 16530-1:2017, Petroleum and natural gas industries — Well integrity – Part 1: Life cycle governance, First Edition, March 2017. Global Standards
Rack Phase Difference

Rack Phase Difference

Definition(s)

Rack Phase Difference

The difference in elevations between the chords of any one leg.

Source: ABS Guidance Notes on Geotechnical Performance of Spudcan Foundations, January 2017. Global Standards

Rack Phase Difference

Relative difference in the position of adjacent leg chords within a leg measured parallel to the longitudinal axis of the chords. NOTE This is the out-of-plane distortion of the plan-frame. Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global Standards
Racking Pipe or Rods

Racking Pipe or Rods

Definition(s)

Racking pipe or rods

Act of placing stands of pipe or rods in an orderly arrangement in the derrick. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards  
Radiation

Radiation

Definition(s)

Radiation

Radiation means ionising and non-ionising radiation. Source: Guidelines Regarding the Activities Regulations, Norway, updated December 2012. Regulatory Guidance  

Radiation

Radiation as mentioned in the first subsection, means ionising and non-ionising radiation. Source: Guidelines Regarding the Facilities Regulations, Norway, updated December 2012. Regulatory Guidance Source: Guidelines Regarding the Technical and Operational Regulations, Norway, updated December 2012. Regulatory Guidance  

Radiation

Radiation as mentioned in fourth subsection, means ionising and non-ionising radiation. Source: Guidelines Regarding the Technical and Operational Regulations, Norway, updated December 2012. Regulatory Guidance
Radiation Intensity

Radiation Intensity

Definition(s)

Radiation Intensity

Local radiant heat transfer rate from the flare flame, usually considered at grade level. Source: API STD 521, Pressure-relieving and Depressuring Systems, Sixth Edition, January 2014. Global Standards Source: API STD 521, Pressure-relieving and Depressuring Systems, Fifth Edition, January 2007 (Addendum May 2008). Global Standards  
Radio Watch

Radio Watch

Definition(s)

Radio Watch

the period during which a member of the complement is required to be at, and in charge of, the radio communication equipment. Source: Atlantic Canada Offshore Petroleum Industry, Standard Practice for the Training and Qualifications of Personnel, 2013, Canadian Association of Petroleum Producers, Global Standards
Radioisotope

Radioisotope

Definition(s)

Radioisotope

Unstable isotope of an element that disintegrates spontaneously, emitting radiation. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards  
Radiotelephony Device

Radiotelephony Device

Definition(s)

Radiotelephony Device

Radiotelephony device: a radio-electric transceiver including the antenna device and the power supply unit. Source: Mining Regulation of the Netherlands, WJZ 02063603, Netherlands,16 December 2002. Regulations
Radius Of Exposure

Radius Of Exposure

Definition(s)

Radius Of Exposure (ROE)

ROE is defined in Texas Administrative Code, Title 16, Part 1, Chapter 3, Rule 3.36, b) 3); see A.4.5. Other methods of calculating ROE may apply, depending on local regulations. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards  

Radius Of Exposure

"Radius of exposure" means that radius constructed with the point of escape of poisonous (hydrogen sulfide) gas as its starting point and its length calculated by use of the Pasquill-Gifford equations. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. Regulations

Radius Of Exposure

“Radius of exposure” means the radius constructed with the point of escape as its starting point and its length calculated using the following Pasquill-Gifford derived equation, or by such other method as the division may approve:
  1. for determining the 100-ppm radius of exposure:  X = [(1.589)(hydrogen sulfide concentration)(Q)](0.6258), where “X” is the radius of exposure in feet, the “hydrogen sulfide concentration” is the decimal equivalent of the mole or volume fraction of hydrogen sulfide in the gaseous mixture and “Q” is the escape rate expressed in cubic feet per day (corrected for standard conditions of 14.73 psi absolute and 60 degrees fahrenheit);
  2. for determining the 500-ppm radius of exposure:  X = [(0.4546)(hydrogen sulfide concentration)(Q)](0.6258), where “X” is the radius of exposure in feet, the “hydrogen sulfide concentration” is the decimal equivalent of the mole or volume fraction of hydrogen sulfide in the gaseous mixture and “Q” is the escape rate expressed in cubic feet per day (corrected for standard conditions of 14.73 psi absolute and 60 degrees fahrenheit);
  3. for a well being drilled, completed, recompleted, worked over or serviced in an area where insufficient data exists to calculate a radius of exposure but where hydrogen sulfide could reasonably be expected to be present in concentrations in excess of 100 ppm in the gaseous mixture, a 100-ppm radius of exposure equal to 3000 feet is assumed.
Source: Oil and Gas, New Mexico Administrative Code Title 19, Chapter 15, January 2013. Regulations  

Radius Of Exposure

That radius constructed with the point of escape as its starting point and its length calculated as provided for in subsection (c)(2) of this section. Source: Oil and Gas Division, Texas Administrative Code, Title 16, Chapter 3, February 2013. Regulations      
Raised Quarterdeck

Raised Quarterdeck

Definition(s)

Raised Quarterdeck

Raised quarterdeck. A raised quarterdeck is a superstructure which extends forward from the after perpendicular, generally has a height less than a normal superstructure, and has an intact front bulkhead (sidescuttles of the non-opening type fitted with efficient deadlights and bolted man hole covers) (see figure 3.4). Where the forward bulkhead is not intact due to doors and access openings, the superstructure is then to be considered as a poop. figure3.42 <Chapter I, regulation 3>. Source: IMO Resolution MSC.143(77), amendments to Annex B to the 1988 Load Lines Protocol, 5 June 2003, International Maritime Organization. Legislation
RAL

RAL

Definition(s)

RAL

“Reichsausschuss für Lieferbedingungen”, a Colour system used by German paint manufacturers. Source: API RP 17A, Design and Operation of Subsea Production Systems—General Requirements and Recommendations, Fourth Edition, Reaffirmed 2011. Global Standards  
RAM

RAM

Definition(s)

RAM

El componente de cierre y sello de un arreglo de preventoras de reventones.

Source: Resolución Número 40687 de 18 Jul 2017 Por la cual se establecen los criterios técnicos para proyectos de perforación exploratoria de hidrocarburos costa afuera en Colombia. Columbia Ministerio de Minas y Energia, Regulations

RAM

Risk Assessment Matrix. Source: International Association of Drilling Contractors, Appendix 2 to Health, Safety and Environment Case Guidelines for Offshore Drilling Contractors, Issue 3.3.2, February 2010. IADC Guidelines Source: NOPSEMA Guidance Note: Noise Management—Principles of Assessment and Control, N-09000-GN0401, Australia, Revision 3, December 2011. Regulatory Guidance
Ram Blowout Preventer

Ram Blowout Preventer

Definition(s)

Ram blowout preventer

Blowout preventer that uses metal blocks assembled with elastomer seals to seal off pressure on a wellbore, with or without tubulars in the bore. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global Standards

Ram blowout preventer

Blowout preventer that uses two opposing metal elements (rams) with integral elastomer seals to contain pressure within a wellbore. NOTE Rams may be designed to close on a specific pipe size (fixed pipe rams), a range of pipe sizes (variable bore rams), or open hole (blind or blind/shear rams). Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards  

Ram blowout preventer

Blowout preventer that uses metal blocks with integral elastomer seals to seal off pressure on a wellbore with or without tubulars in the bore. Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global Standards
Ram BOP

Ram BOP

Definition(s)

Ram BOP

Blowout preventer that uses metal blocks assembled with elastomer seals to seal off pressure on a wellbore with or without tubulars in the bore.

Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global Standards

Ram BOP

A blowout preventer that uses rams to seal off pressure in the wellbore. Source: API SPEC 16D, Specification for Control Systems for Drilling Well Control Equipment and Control Systems for Diverter Equipment, Upstream Segment, Second Edition, July 2004. Global Standards
RAM(S)

RAM(S)

Definition(s)

RAM(S)

Reliability, availability, maintainability (and safety). Source: API STD 689, Collection and Exchange of Reliability and Maintenance Data for Equipment, First Edition, July 2007. Global Standards  
Ramping

Ramping

Definition(s)

Ramping

  1. Gradual startup or shutdown of a pump unit.
  2. Modeling term meaning to change variables with time.
Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Random Failure

Random Failure

Definition(s)

Random Failure

failure, occurring in a random way Note 1 to entry: A random failure may be time or demand dependent. Whether it occurs or not is not predictable with certainty but the corresponding failure rate (see 3.1.18) or probability of a failure due to demand (see 3.2.13) may be predictable and this allows probabilistic calculations. EXAMPLE Examples of failure mechanisms leading to unpredictable failure occurrence are: hardware random failures resulting from degradation mechanisms; human random failure resulting from error in routine operation, lack of attention, stress, tiredness, etc   Note 2 to entry: From the probabilistic point of view, the random failures are the contrary of systematic failures (see 3.2.17) which occur in a deterministic way (i.e. with a probability equal to 1) when some conditions are met. Source: ISO/TR 12489:2013(E) Reliability modelling and calculation of safety systems. Global Standards
Range

Range

Definition(s)

Range

A length classification for API Oil Country Tubular Goods. Source: API RP 7G, Recommended Practice for Drill Stem Design and Operating Limits, Upstream Segment, Sixteenth Edition, August 1998 (Addendum 2: September 2009). Global Standards  
Rankine

Rankine

Definition(s)

Rankine

(degrees temperature) - English measurement of absolute temperature (+459.69 offset). Source: IADC UBO / MPD Glossary, December 2011. Global Standards
RAO

RAO

Definition(s)

RAO

Ratio of a vessel’s motion to the wave amplitude causing that motion and presented over a wide range of wave periods.

Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards

RAO

Relationship between wave surface elevation amplitude at a reference location and the vessel response amplitude, and the phase lag between the two. Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards

RAO

See Response Amplitude Operator. Source: API RP 16Q, Recommended Practice for Design, Selection, Operation and Maintenance of Marine Drilling Riser Systems, First Edition, November 1993 (Reaffirmed August 2001). Global Standards Source: Deepwater Well Control Guidelines. IADC Guidelines  

RAO

Response Amplitude Operator. Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards Source: API SPEC 17E, Specification for Subsea Umbilicals, Upstream Segment, Fourth Edition, October 2010. Global Standards Source: API SPEC 17J, Specification for Unbonded Flexible Pipe, Third Edition, July 2008. Global Standards Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards Source: ISO 13624-1:2009, Petroleum and natural gas industries – Drilling and production equipment – Part 1:Design and operation of marine drilling riser equipment. Global Standards  

RAO (regular waves)

Ratio of a vessel's motion to the wave amplitude causing that motion and presented over a range of wave periods. Source: ISO 13624-1:2009, Petroleum and natural gas industries – Drilling and production equipment – Part 1:Design and operation of marine drilling riser equipment. Global Standards
Rapid Decompression

Rapid Decompression

Definition(s)

Rapid Decompression

Sudden depressurization of a system during which gas in the pipe expands rapidly and can cause blistering or collapse of the internal pressure sheath or other gas-saturated layers. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards  
Rapid Discharge Accumulators

Rapid Discharge Accumulators

Definition(s)

Rapid Discharge Accumulators

Accumulators required to satisfy their functional fluid demand in less than 3 min. This includes dedicated shear (both surface and subsea), dead man systems, autoshear accumulators, some acoustic and special purpose accumulators. Source: API SPEC 16D, Specification for Control Systems for Drilling Well Control Equipment and Control Systems for Diverter Equipment, Upstream Segment, Second Edition, July 2004. Global Standards  
RARS

RARS

Definition(s)

RARS

Riser anti-recoil system. Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global Standards