Mechanical Damage

Mechanical Damage

Definition(s)

Mechanical Damage

A defect type that includes dents, bows, gouges, holes, and separated or severed members. Source: API RP 2SIM, Structural Integrity Management of Fixed Offshore Structures, First Edition, November 2014. Global Standards
Life Extension

Life Extension

Definition(s)

Life Extension

The process of extending the operational life of a structure beyond the life considered during the structure's design. Source: API RP 2SIM, Structural Integrity Management of Fixed Offshore Structures, First Edition, November 2014. Global Standards
Full Population Hurricane

Full Population Hurricane

Definition(s)

Full Population Hurricane

A population of hurricanes that includes all hurricanes that develop inside or outside of the Gulf of Mexico, used for statistical analysis. Source: API RP 2SIM, Structural Integrity Management of Fixed Offshore Structures, First Edition, November 2014. Global Standards
Exposure Category

Exposure Category

Definition(s)

Exposure Category

The classification used to categorize the platform consequence of failure based on the consideration of life safety, environmental pollution, and business disruption. Source: API RP 2SIM, Structural Integrity Management of Fixed Offshore Structures, First Edition, November 2014. Global Standards
Deterioration

Deterioration

Definition(s)

Deterioration

The reduction in the ability of a component to provide its intended purpose. Source: API RP 2SIM, Structural Integrity Management of Fixed Offshore Structures, First Edition, November 2014. Global Standards
Design Level Analysis

Design Level Analysis

Definition(s)

Design Level Analysis

A fitness-for-purpose analysis of a platform using linear-elastic methods with an appropriate safety margin, similar to the analysis methods used for new platform designs. Source: API RP 2SIM, Structural Integrity Management of Fixed Offshore Structures, First Edition, November 2014. Global Standards
Deck Elevation

Deck Elevation

Definition(s)

Deck Elevation

The measured distance from the underside (bottom-of-steel) of the support structure of a topside deck structure to a confirmed datum, such as the mean sea level (MSL). Source: API RP 2SIM, Structural Integrity Management of Fixed Offshore Structures, First Edition, November 2014. Global Standards
Damage Tolerance

Damage Tolerance

Definition(s)

Damage Tolerance

The quantity of deterioration or damage that a structure can withstand without failing. Source: API RP 2SIM, Structural Integrity Management of Fixed Offshore Structures, First Edition, November 2014. Global Standards
Consequence of Failure Category

Consequence of Failure Category

Definition(s)

Consequence of Failure Category

A system applied to categorize the consequences of failure of an existing offshore platform. Source: API RP 2SIM, Structural Integrity Management of Fixed Offshore Structures, First Edition, November 2014. Global Standards
Condition Assessment

Condition Assessment

Definition(s)

Condition Assessment

The process of gathering the information on the platform's present condition needed in order to perform a fitness-for purpose assessment. Source: API RP 2SIM, Structural Integrity Management of Fixed Offshore Structures, First Edition, November 2014. Global Standards
Collapse

Collapse

Definition(s)

Collapse

The ultimate load bearing capacity of the platform at which the jacket structure or deck columns are no longer able to support vertical loads Source: API RP 2SIM, Structural Integrity Management of Fixed Offshore Structures, First Edition, November 2014. Global Standards
Assessment Initiators

Assessment Initiators

Definition(s)

Assessment Initiators

Changes in platform condition or operating experience, such as storms, which require an existing platform to undergo an assessment to demonstrate fitness-for-purpose. Source: API RP 2SIM, Structural Integrity Management of Fixed Offshore Structures, First Edition, November 2014. Global Standards
Anomaly

Anomaly

Definition(s)

Anomaly

Condition that differs from what is expected or typical, or which differs from that predicted by a theoretical model. Source: ISO 16530-1:2017, Petroleum and natural gas industries - Well integrity – Part 1: Life cycle governance, First Edition, March 2017. Global Standards

Anomaly

An in-service survey measurement that is outside the threshold considered acceptable from the design or most recent fitness-for-purpose assessment. Source: API RP 2SIM, Structural Integrity Management of Fixed Offshore Structures, First Edition, November 2014. Global Standards
Design Crest Elevation

Design Crest Elevation

Definition(s)

Design Crest Elevation

Extreme crest elevation measured relative to still water level NOTE The design crest elevation is used in combination with information on astronomical tide, storm surge, platform settlement, reservoir subsidence and water depth uncertainty and is derived from an extreme value analysis. Because of the simplified nature of the models used to estimate the kinematics of the design wave, the design crest elevation can be different from, usually somewhat greater than, the crest elevation of the design wave used to calculate actions on the structure. Source: API RP 2MET, Derivation of Metocean Design and Operating Conditions, First Edition, November 2014. Global Standards
Conditional Probability

Conditional Probability

Definition(s)

Conditional Probability

Statistical distribution (probability) of the occurrence of a variable A, given that other variables B, C, ... have certain assigned values NOTE The conditional probability of A given that B, C, ... occur is written as P(AIB,C, ... ). The concept is applicable to metocean parameters, as well as to actions and action effects. EXAMPLE When considering wave parameters, A can be the individual crest elevation, B the water depth and C the significant wave height, and so on. Source: API RP 2MET, Derivation of Metocean Design and Operating Conditions, First Edition, November 2014. Global Standards  

Conditional Probability

Conditional probability is the probability of some event A, given the occurrence of some other event B, written as P(A|B). An example is the conditional probability of a person dying (event A), given that they contract the pandemic flu (event B). Sample Usage: An individual has a higher conditional probability of developing a fever if they contract influenza. Source: DHS Risk Lexicon, U.S. Department of Homeland Security, 2010 Edition. September 2010 Regulatory Guidance
Conditional Distribution

Conditional Distribution

Definition(s)

Conditional Distribution

Statistical distribution (probability) of the occurrence of a variable A, given that other variables B, C, ... have certain assigned values NOTE The conditional probability of A given that B, C, ... occur is written as P(AIB,C, ... ). The concept is applicable to metocean parameters, as well as to actions and action effects. EXAMPLE When considering wave parameters, A can be the individual crest elevation, B the water depth and C the significant wave height, and so on. Source: API RP 2MET, Derivation of Metocean Design and Operating Conditions, First Edition, November 2014. Global Standards
Tsunami

Tsunami

Definition(s)

Tsunami

Long period sea waves caused by rapid vertical movements of the sea floor. NOTE The vertical movement of the sea floor is often associated with fault rupture during earthquakes or with seabed mud slides Source:API RP 2EQ, Seismic Design Procedures and Criteria for Offshore Structures, First Edition, November 2014. Global Standards
Static Pushover Analysis

Static Pushover Analysis

Definition(s)

Static Pushover Analysis

Application and incremental increase of a global static pattern of actions on a structure, including equivalent dynamic inertial actions, until a global failure mechanism occurs. Source:API RP 2EQ, Seismic Design Procedures and Criteria for Offshore Structures, First Edition, November 2014. Global Standards
Static Pushover Method

Static Pushover Method

Definition(s)

Static Pushover Method

Application and incremental increase of a global static pattern of actions on a structure, including equivalent dynamic inertial actions, until a global failure mechanism occurs. Source:API RP 2EQ, Seismic Design Procedures and Criteria for Offshore Structures, First Edition, November 2014. Global Standards
Spectral Velocity

Spectral Velocity

Definition(s)

Spectral Velocity

Maximum pseudo velocity response of a single degree of freedom oscillator subjected to ground motions due to an earthquake. Source:API RP 2EQ, Seismic Design Procedures and Criteria for Offshore Structures, First Edition, November 2014. Global Standards
Spectral Displacement

Spectral Displacement

Definition(s)

Spectral Displacement

The method (e.g. splice, potted socket, wedged socket) by which the rope is attached to the assembly interface. Source:API RP 2EQ, Seismic Design Procedures and Criteria for Offshore Structures, First Edition, November 2014. Global Standards
Spectral Acceleration

Spectral Acceleration

Definition(s)

Spectral Acceleration

Maximum absolute acceleration response of a single degree of freedom oscillator subjected to ground motions due to an earthquake. Source:API RP 2EQ, Seismic Design Procedures and Criteria for Offshore Structures, First Edition, November 2014. Global Standards
Site Response Analysis

Site Response Analysis

Definition(s)

Site Response Analysis

Upward wave propagation analysis from underlying bedrock to seafloor permitting the evaluation of the effect of local geological and soil conditions on the design ground motions at a given site. NOTE The site response analysis results can include amplitude, frequency content, and duration. Source:API RP 2EQ, Seismic Design Procedures and Criteria for Offshore Structures, First Edition, November 2014. Global Standards
SRC

SRC

Definition(s)

SRC

Seismic risk category Source:API RP 2EQ, Seismic Design Procedures and Criteria for Offshore Structures, First Edition, November 2014. Global Standards

SRC

Category defined from the exposure level and the expected intensity of seismic motions. Source:API RP 2EQ, Seismic Design Procedures and Criteria for Offshore Structures, First Edition, November 2014. Global Standards
Seismic Risk Category

Seismic Risk Category

Definition(s)

Seismic Risk Category

Category defined from the exposure level and the expected intensity of seismic motions. Source:API RP 2EQ, Seismic Design Procedures and Criteria for Offshore Structures, First Edition, November 2014. Global Standards
Seismic Reserve Capacity Factor

Seismic Reserve Capacity Factor

Definition(s)

Seismic Reserve Capacity Factor

Ratio of spectral acceleration which causes structural collapse or catastrophic system failure to the ELE spectral acceleration. Source:API RP 2EQ, Seismic Design Procedures and Criteria for Offshore Structures, First Edition, November 2014. Global Standards
Seismic Hazard Curve

Seismic Hazard Curve

Definition(s)

Seismic Hazard Curve

Curve showing the probability of exceedance against a measure of seismic intensity. NOTE The seismic intensity measures can include parameters such as peak ground acceleration, spectral acceleration, or spectral velocity. Source:API RP 2EQ, Seismic Design Procedures and Criteria for Offshore Structures, First Edition, November 2014. Global Standards
Sea Floor Slide

Sea Floor Slide

Definition(s)

Sea Floor Slide

Failure of sea floor slopes. Source:API RP 2EQ, Seismic Design Procedures and Criteria for Offshore Structures, First Edition, November 2014. Global Standards
Safety Systems

Safety Systems

Definition(s)

Safety Systems

Systems provided on a platform to detect, control, and mitigate hazardous situations. NOTE Safety systems include gas detection, emergency shutdown, fire protection, and their control systems. Source:API RP 2EQ, Seismic Design Procedures and Criteria for Offshore Structures, First Edition, November 2014. Global Standards  

Safety Systems

Systems, including required utilities, which are provided to prevent, detect/ warn of an accidental event/abnormal conditions and/or mitigate its effects Interpretation: The following should be considered as safety systems: — ESD, including blowdown where relevant — PSD — fire and gas detection — PA/GA — fire-fighting systems — BOP incl. control system — safety systems for essential or important services — safety systems are normally considered as “on-demand” functions. Source: Rules for Classification – Offshore units, DNVGL-OU-0101, Offshore drilling and support units, DNV GL, July 2015. Global Standards
Response Spectrum

Response Spectrum

Definition(s)

Response Spectrum

Plot representing structural response in terms of absolute acceleration, pseudo velocity, or relative displacement values against a structural natural frequency or period. Source:API RP 2EQ, Seismic Design Procedures and Criteria for Offshore Structures, First Edition, November 2014. Global Standards