Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
Multi-well Pits
Definition(s)
Multi-well Pits
MULTI-WELL PITS shall mean pits used for treatment, storage, recycling, reuse, or disposal of E&P wastes generated from more than one (1) well that do not constitute a centralized E&P waste management facility and that will be in use for no more than three (3) years. Source: Oil and Gas Conservation Commission, Practice and Procedure, Code of Colorado Regulations, 2 CCR 404-1, February 2013. RegulationsOperating Manual
Definition(s)
Operating Manual
Publication issued by the supplier/manufacturer, which contains detailed data and instructions related to the design, installation, operation, and maintenance of a particular tool.
Source:API SPECIFICATION 19TT, Specification for Downhole Well Test Tools and Related Equipment, First Edition, October 2016. Global StandardsOperating Manual
Publication issued by the manufacturer which contains detailed data and instructions related to the design, installation, operation and maintenance of equipment. Source: API SPEC 14A, Specification for Subsurface Safety Valve Equipment, Eleventh Edition, October 2005 (Reaffirmed June 2012). Global StandardsOperating Manual
Manual that defines the operational characteristics and capabilities of the jack-up in accordance with the IMO MODU code. NOTE The assessor is advised to ensure that the operations manual referenced is the latest revision and that any updated weight data are provided. Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global StandardsMarine Operations Manual
Definition(s)
Marine Operations Manual
Manual that defines the operational characteristics and capabilities of the jack-up in accordance with the IMO MODU code. NOTE The assessor is advised to ensure that the operations manual referenced is the latest revision and that any updated weight data are provided. Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global StandardsNominal Strength
Definition(s)
Nominal Strength
Strength calculated for a cross-sectional area, taking into account the stress raising effects of the macro-geometrical shape of the component of which the section forms a part, but disregarding the local stress raising effects from the section shape and any weldment or other fixing detail. NOTE Adapted from ISO 19902:2007, definition 3.34. Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global StandardsMPME
Definition(s)
MPME
Value of the maximum of a variable with the highest probability of occurring over a defined period of time. NOTE 1 A defined period of time can be, for example, X hours. NOTE 2 The most probable maximum extreme is the value for which the probability density function of the maxima of the variable has its peak. It is also called the mode or modus of the statistical distribution. NOTE 3 Adapted from ISO 19901-1:2005, definition 3.19. Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global StandardsMPME
Most probable maximum extreme. Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global StandardsMost Probable Maximum Extreme
Definition(s)
Most Probable Maximum Extreme
Value of the maximum of a variable with the highest probability of occurring over a defined period of time. NOTE 1 A defined period of time can be, for example, X hours. NOTE 2 The most probable maximum extreme is the value for which the probability density function of the maxima of the variable has its peak. It is also called the mode or modus of the statistical distribution. NOTE 3 Adapted from ISO 19901-1:2005, definition 3.19. Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global StandardsMean Zero-Upcrossing Period
Definition(s)
Mean Zero-Upcrossing Period
average period of the (up or down) zero-crossing waves in a sea state NOTE In practice the mean zero-crossing period is often estimated from the zeroth and second moments of the wave spectrum as.
Source: API RP 2MET, Derivation of Metocean Design and Operating Conditions, First Edition, November 2014. Global Standards
Mean Zero-Upcrossing Period
average intrinsic period of the zero-upcrossing waves in a sea state. NOTE 1 In practice, the mean zero-crossing period is often estimated from the zeroth and second moments of the wave spectrum as given by Equation (3.41-1):
where
f is the frequency in cycles per second (hertz);
m0 is the zeroth spectral moment and is equivalent to σ2, the variance of the corresponding time series;
m2 is the second spectral moment;
T2 and Tz are the average zero-crossing period of the water surface elevation, defined by the zeroth and second order spectral moments, (T2 = Tz);
ω is the wave frequency in radians per second.
NOTE 2 Adapted from ISO 19901-1:2005, definition 3.17.
Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global Standards