LAT

LAT

Definition(s)

LAT

level of low tide when all harmonic components causing the tides are in phase NOTE The harmonic components are in phase approximately once every 19 years, but these conditions are approached several times each year. Source: API RP 2MET, Derivation of Metocean Design and Operating Conditions, First Edition, November 2014. Global Standards

LAT

Level of low tide when all harmonic components causing the tides are in phase. NOTE The harmonic components are in phase approximately once every 19 years, but these condition. Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global Standards

LAT

Lowest astronomic tide. Source: API RP 2MET, Derivation of Metocean Design and Operating Conditions, First Edition, November 2014. Global Standards Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global Standards Source: NORSOK D-010, Well integrity in drilling and well operations, Rev. 3, August 2004. Global Standards  
HS

HS

Definition(s)

HS

Significant wave height. Source: API Standard 2CCU, Offshore Cargo Carrying Units, First Edition, August 2017. Global Standards

HS

High strength. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards
HISC

HISC

Definition(s)

HISC

Hydrogen induced stress cracking. Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards
Hindcasting

Hindcasting

Definition(s)

Hindcasting

Method of simulating historical (metocean) data for a region through numerical modelling Source: API RP 2MET, Derivation of Metocean Design and Operating Conditions, First Edition, November 2014. Global Standards

Hindcasting

A method using registered meteorological data to reproduce environmental parameters. Mostly used for reproducing wave parameters. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards
HAT

HAT

Definition(s)

HAT

Level of high tide when all harmonic components causing the tides are in phase NOTE The harmonic components are in phase approximately once every 19 years, but these conditions are approached several times each year. Source: API RP 2MET, Derivation of Metocean Design and Operating Conditions, First Edition, November 2014. Global Standards

HAT

Highest astronomical tide. Source: API RP 2MET, Derivation of Metocean Design and Operating Conditions, First Edition, November 2014. Global Standards Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards
Guidance Note

Guidance Note

Definition(s)

Guidance note

Information in the standard added in order to increase the understanding of the requirements. Sources: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards  

Guidance note

Contains advice which is not mandatory for the assignment or retention of class, but with which the Society, in light of general experience, advises compliance. Source: Rules for Classification – Offshore units, DNVGL-OU-0101, Offshore drilling and support units, DNV GL, July 2015. Global Standards
Foundation

Foundation

Definition(s)

Foundation

Soil and spudcan supporting a jack-up leg. Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global Standards

Foundation

A device transferring loads from a heavy or loaded object to the vessel structure. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards  
Fatigue Limit States

Fatigue Limit States

Definition(s)

Fatigue Limit States

The fatigue limit state (FLS) addresses the cumulative effects of cyclic loading. Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards

Fatigue Limit States (FLS)

Related to the possibility of failure due to the effect of cyclic loading. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards
Fatigue Critical

Fatigue Critical

Definition(s)

Fatigue critical

Structure with calculated fatigue life near the design fatigue life. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards
Response History

Response History

Definition(s)

Expected loads and response history

Expected load and response history for a specified time period, taking into account the number of load cycles and the resulting load levels and response for each cycle. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards  
Expected Loads

Expected Loads

Definition(s)

Expected loads and response history

Expected load and response history for a specified time period, taking into account the number of load cycles and the resulting load levels and response for each cycle. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards
National Fire Code

National Fire Code

Definition(s)

National Fire Code

“National Fire Code” means the National Fire Code of Canada, 1985, issued by the Associate Committee on the National Fire Code, National Research Council of Canada, dated 1985, as amended to January 1987 (Code national de prévention des incendies). Source: Canada Oil and Gas Occupational Safety and Health Regulations, SOR/87-612, February 2013. Regulations Source: Oil and Gas Occupational Safety and Health Regulations, SOR/87-612, Canada, current to April 29, 2013. Regulations  

National Fire Code

“National Fire Code” means the National Fire Code of Canada, 1985; issued by the Associate Committee on the National Fire Code, National Research Council of Canada, as amended from time to time. Source:  Nova Scotia Offshore Petroleum Occupational Health & Safety Requirements, Canada-Nova Scotia Offshore Petroleum Board, Canada, December 2000. Regulations
EHS

EHS

Definition(s)

EHS

Extra high strength. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards
DFF

DFF

Definition(s)

DFF

Design fatigue factor. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards  

DFF

Design fatigue factors. Source: Rules for Classification – Offshore units, DNVGL-OU-0101, Offshore drilling and support units, DNV GL, July 2015. Global Standar
National Building Code

National Building Code

Definition(s)

National Building Code

“National Building Code” means the National Building Code of Canada, 1985, issued by the Associate Committee on the National Building Code, National Research Council of Canada, dated 1985, as amended to January 1987 (Code national du bâtiment). Source: Canada Oil and Gas Occupational Safety and Health Regulations, SOR/87-612, February 2013. Regulations Source: Oil and Gas Occupational Safety and Health Regulations, SOR/87-612, Canada, current to April 29, 2013. Regulations  

National Building Code

“National Building Code” means the National Building Code of Canada, 1985, issued by the Associate Committee on the National Building Code, National Research Council of Canada, as amended from time to time. Source:  Nova Scotia Offshore Petroleum Occupational Health & Safety Requirements, Canada-Nova Scotia Offshore Petroleum Board, Canada, December 2000. Regulations
Driving Voltage

Driving Voltage

Definition(s)

Driving voltage

The difference between closed circuit anode potential and the protection potential. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards
Design Value

Design Value

Definition(s)

Design value

value derived from the representative value for use in the design verification procedure. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards

Design value

The value to be used in the deterministic design procedure, i.e. characteristic value modified by the resistance factor or load factor. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards
Design Brief

Design Brief

Definition(s)

Design brief

An agreed document where owners requirements in excess of this standard should be given. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards
DDF

DDF

Definition(s)

DDF

Deep draught floaters. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards
CN

CN

Definition(s)

CN

Classification note. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards  

CN

Control 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 Standard
Classification Note

Classification Note

Definition(s)

Classification note

The Classification Notes cover proven technology and solutions which is found to represent good practice by DNV, and which represent one alternative for satisfying the requirements stipulated in the DNV Rules or other codes and standards cited by DNV. The classification notes will in the same manner be applicable for fulfilling the requirements in the DNV offshore standards. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards
Characteristic Material Strength

Characteristic Material Strength

Definition(s)

Characteristic material strength

The nominal value of material strength to be used in the determination of the design resistance. The characteristic material strength is normally based upon a 5% fractile in the lower end of the distribution function for material strength. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards
Characteristic Resistance

Characteristic Resistance

Definition(s)

Characteristic resistance

The reference value of structural strength to be used in the determination of the design strength. The characteristic resistance is normally based upon a 5% fractile in the lower end of the distribution function for resistance. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards
Dynamic Tension Limit

Dynamic Tension Limit

Definition(s)

Dynamic Tension Limit

Maximum allowable pressure multiplied by the effective hydraulic area, divided by the number of line parts. 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  
Characteristic Load

Characteristic Load

Definition(s)

Characteristic load

The reference value of a load to be used in the determination of load effects. The characteristic load is normally based upon a defined fractile in the upper end of the distribution function for load. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards
Dynamic Positioning

Dynamic Positioning

Definition(s)

Dynamic Positioning

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

Dynamic Positioning

Computerized means of maintaining a vessel on location by selectively activating thrusters. 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  

Dynamic Positioning

Stationkeeping technique consisting primarily of a system of automatically controlled on-board thrusters, which generate appropriate thrust vectors to counter the mean and slowly varying induced actions. 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  

Dynamic Positioning

Dynamic Positioning System means a system whereby a self-propelled MOU's position and heading is automatically controlled by using its own propulsion units. Source: IMO Resolution A.1079(28), Recommendations for the Training and Certification of Personnel on Mobile Offshore Units (MOUs), Adopted on 4 December 2013, International Maritime Organization, Regulatory Guidance

Dynamic Positioning

Computerized means of maintaining a vessel on location by selectively driving thrusters. 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  

Dynamic Positioning

“Dynamic positioning system ” means a system where power supply, thruster system and control system are assembled and can be operated to maintain the fixed position automatically. Source: Petroleum and Natural Gas (Safety in Offshore Operations) Rules, 2008, India, 18th June 2008. Regulations  

Dynamic Positioning (automatic station keeping)

A computerized means of maintaining a vessel on location by selectively driving thrusters. 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
Cathodic Protection

Cathodic Protection

Definition(s)

Cathodic protection

A technique to prevent corrosion of a steel surface by making the surface to be the cathode of an electrochemical cell. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards  

Cathodic protection

Type of protection that prevents external corrosion; it consists of setting up a current around the line or vessel to reverse the flow of electrons and thus inhibit corrosion. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
DTL

DTL

Definition(s)

DTL

Dynamic tension limit. 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  
Average

Average

Definition(s)

Average

Average during one day and night. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards
Atmospheric zone

Atmospheric zone

Definition(s)

Atmospheric zone

The external surfaces of the unit above the splash zone. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards  

Atmospheric zone

That part of the external structure above the splash zone. Source: Rules and Regulations for the Classification of Mobile Offshore Units, Part 8, Corrosion Controls, June 2013, Lloyd’s Register, Global Standards