Temperature, Autoignition (AIT)

Temperature, Autoignition (AIT)

Definition(s)

Temperature, Autoignition (AIT)

The minimum temperature required to initiate or cause self-sustained combustion of a solid, liquid, or gas independently of the heating or heated element.

Source: API Recommended Practice 14FZ, Recommended Practice for Design, Installation, and Maintenance of Electrical Systems for Fixed and Floating Offshore Petroleum Facilities for Unclassified and Class I, Zone 0, Zone 1, and Zone 2 Locations, Second Edition, May 2013. Global Standards
TML

TML

Definition(s)

TML

Thickness monitoring location. Source: API 570, Piping Inspection Code: In-service Inspection, Rating, Repair, and Alteration of Piping Systems, Fourth Edition, February 2016, with Addendum May 2017. Global Standards
Tank Farm Piping

Tank Farm Piping

Definition(s)

Tank Farm Piping

Process piping inside tank farm dikes or directly associated with a tank farm.

Source: API 570, Piping Inspection Code: In-service Inspection, Rating, Repair, and Alteration of Piping Systems, Fourth Edition, February 2016, with Addendum May 2017. Global Standards
Tmin

Tmin

Definition(s)

Tmin

Minimum required thickness. Source: API 570, Piping Inspection Code: In-service Inspection, Rating, Repair, and Alteration of Piping Systems, Fourth Edition, February 2016, with Addendum May 2017. Global Standards  

Tmin

The thickness without corrosion allowance for each component of a piping system based on the appropriate design code calculations and code allowable stress that consider pressure, mechanical and structural loadings.
  • NOTE: Alternately, minimum required thicknesses can be reassessed using Fitness-For-Service analysis in accordance with API 579-1/ASME FFS-1.
Source: API 570, Piping Inspection Code: In-service Inspection, Rating, Repair, and Alteration of Piping Systems, Fourth Edition, February 2016, with Addendum May 2017. Global Standards
Tightness Test

Tightness Test

Definition(s)

Tightness Test

A pressure test that is conducted on pressure vessels after maintenance or repair activities to indicate that the equipment is leak free and is conducted at a test pressure determined by the owner/user that is not higher than the MAWP.

Source: API 510, Pressure Vessel Inspection Code: In-service Inspection, Rating, Repair, and Alteration, Tenth Edition, May 2014, with Addendum May 2017. Global Standards
Tdes

Tdes

Definition(s)

Tdes

For each design condition, maximum fluid temperature that can be reached during service. 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
Tg

Tg

Definition(s)

Tg

Glass Transition Temperature. 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

Tg

Temperature at which the amorphous portion of the polymer undergoes a marked change in properties on passing from the rubbery to glassy state
  • Note: 1 to entry: This observed change in properties is associated with the virtual cessation of local molecular motion in the polymer. Below their glass-transition temperature, amorphous polymers have many of the properties associated with ordinary inorganic glasses, while above this temperature the polymers possess rubbery characteristics.
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
Thermoset

Thermoset

Definition(s)

Thermoset

Plastic which, when cured by application of heat and/or chemical reaction, changes into a substantially infusible and insoluble material.
  • Note: 1 to entry: Unlike in thermoplastics, the curing process in thermosets creates a chemical bond that prevents the material from being remelted.
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
Thermosetting Resin

Thermosetting Resin

Definition(s)

Thermosetting Resin

Polymer-based liquid that becomes solid upon curing.
  • Note: 1 to entry: Curing is achieved, typically during fabrication, using chemicals, heat and/or radiation.
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
Threshold Envelope

Threshold Envelope

Definition(s)

Threshold Envelope

Envelope that defines the short-term stress levels to avoid incremental damage to the pipe composite laminate.
  • Note: 1 to entry: The threshold envelope is set equal to the long-term envelope at 65 °C (for GRE) or 21 °C (for GRUP and GRVE). As the threshold envelopes are set at fixed temperatures, there is no temperature subscript for the threshold envelope. These definitions of threshold envelope are to the best of present knowledge. However, the manufacturer remains responsible and can declare a more conservative threshold envelope.
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
Tow

Tow

Definition(s)

Tow

Mass of a fibrous bundle expressed per unit length.
  • Note: 1 to entry: A higher tow tex indicates a heavier roving. Tow tex is inversely proportional to yield. Consequently, a lower yield indicates a heavier roving. Tow tex is typically expressed as grams per kilometer. Yield is typically expressed as yards per pound. Tow tex = 496 054,6/yield.
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
Tow Tex

Tow Tex

Definition(s)

Tow Tex

Mass of a fibrous bundle expressed per unit length
  • Note: 1 to entry: A higher tow tex indicates a heavier roving. Tow tex is inversely proportional to yield. Consequently, a lower yield indicates a heavier roving. Tow tex is typically expressed as grams per kilometer. Yield is typically expressed as yards per pound. Tow tex = 496 054,6/yield.
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
Tribocharging

Tribocharging

Definition(s)

Tribocharging

Generation of electrostatic charge caused by moving contact of one insulating material over another. 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
Thruster System

Thruster System

Definition(s)

Thruster System

All components and systems necessary to supply the DP system with thrust force and direction. The thruster system includes:
  • thrusters with drive units and necessary auxiliary systems including piping, cooling, hydraulic, and lubrication systems, etc.
  • main propellers and rudders if these are under the control of the DP system
  • thruster control system(s)
  • manual thruster controls
  • associated cabling and cable routing.
Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory Guidance  

Thruster System

Thruster system means all components and systems necessary to supply the DP system with thrust force and direction. The thruster system includes:
  1. thrusters with drive units and necessary auxiliary systems including piping, cooling, hydraulic, and lubrication systems, etc.;
  2. main propellers and rudders if these are under the control of the DP system;
  3. thruster control system(s);
  4. manual thruster controls; and
  5. associated cabling and cable routeing.
Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory Guidance
Time to Safely Terminate (operations)

Time to Safely Terminate (operations)

Definition(s)

Time to Safely Terminate (operations)

The amount of time required in an emergency to safely cease operations of the DP vessel.

Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory Guidance  

Time to Safely Terminate (operations)

Time to safely terminate (operations) means the amount of time required in an emergency to safely cease operations of the DP vessel.

Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory Guidance
TTAC

TTAC

Definition(s)

TTAC

Tubing to annulus communication .

Source: Norwegian Oil and Gas Association, Guideline No. 135, Recommended Guidelines for Classification and categorization of well control incidents and well integrity incidents, Rev. 4, 27 June 2017, National or Regional Standards
TCD

TCD

Definition(s)

TCD

Thermal conductivity detector. Source:  DNVGL-RP-G108, Cyber security in the oil and gas industry based on IEC 62443, DNV GL, September 2017. Global Standards
TLS

TLS

Definition(s)

TLS

Transport layer security. Source:  DNVGL-RP-G108, Cyber security in the oil and gas industry based on IEC 62443, DNV GL, September 2017. Global Standards
Threat Vector

Threat Vector

Definition(s)

Threat Vector

Path or means by which a threat source can gain access to an organizational asset.

Source:  DNVGL-RP-G108, Cyber security in the oil and gas industry based on IEC 62443, DNV GL, September 2017. Global Standards

Threat Levels

Threat Levels

Definition(s)

Threat Levels

A progressive, qualitative measure of the likelihood of adversarial actions, from negligible to imminent, based on government or company intelligence or information.
  • Note: Different fixed or variable security measures can be implemented based on the level of threat to the facility.

(Source: Security Vulnerability Assessment Methodology for the Petroleum and Petrochemical Industries.

Source: Canadian Standards Association, Z246.1-09, Security management for petroleum and natural gas industry systems, August 2009, Regional Standards
Technical Security Systems

Technical Security Systems

Definition(s)

Technical Security Systems

Technical systems may include electronic systems for increased protection or for other security purposes which may include access control systems, card readers, keypads, electric locks, remote control openers, alarm systems, intrusion detection equipment, annunciating and reporting systems, central stations monitoring, video surveillance equipment, voice communications systems, listening devices, computer security, encryption, data auditing, and scanners. Source: API RP 781 Security Plan Methodology for the Oil and Natural Gas Industries.1st Ed. September 2016. Global Standards
Targeted Screen

Targeted Screen

Definition(s)

Targeted Screen

A criminal record review that considers the nature of the crime, the time elapsed since the offense, and the nature of the job.

Source: API RP 781 Security Plan Methodology for the Oil and Natural Gas Industries.1st Ed. September 2016. Global Standards
Traffic Analysis

Traffic Analysis

Definition(s)

Traffic Analysis

Inference of information from observable characteristics of data flow(s), even when the data are encrypted or otherwise not directly available, including the identities and locations of source(s) and destination(s) and the presence, amount, frequency, and duration of occurrence.

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
Threat Action

Threat Action

Definition(s)

Threat Action

Assault on system security [11]. 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
Technical Authority

Technical Authority

Definition(s)

Technical Authority

Competent and technically qualified person or organization with evidence to demonstrate the expertise, skills, and experience regarding design, quality, and manufacturing processes necessary to perform the required verification(s). Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global Standards

Technical Authority

A competent and technically qualified person or organization with evidence to demonstrate the expertise, skills, and experience regarding quality and manufacturing processes necessary to perform the required verification(s). Source: API Specification 20E, Alloy and Carbon Steel Bolting for Use in the Petroleum and Natural Gas Industries, Second Edition, February 2017. Global Standards
TM

TM

Definition(s)

TM

Nominated minimum operating temperature. Source: API Standard 2CCU, Offshore Cargo Carrying Units, First Edition, August 2017. Global Standards
Tugger Point

Tugger Point

Definition(s)

Tugger Point

Attachments used for handling and not intended for lifting.
  • NOTE: Tugger points are commonly used to move a CCU horizontally across the deck.
Source: API Standard 2CCU, Offshore Cargo Carrying Units, First Edition, August 2017. Global Standards
Tare

Tare

Definition(s)

Tare

The weight of the empty CCU, including any permanent equipment and excluding cargo and the lifting set.

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

Tmax

Definition(s)

Tmax

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

Termination Joint

Definition(s)

Termination Joint

Special riser joint that provides for the redirection of fluid flow for one or more external lines on the marine riser string.
  • NOTE: It is generally used for ending the booster line at the bottom of the riser string or redirecting flow for the choke, kill, and auxiliary lines at the top of the riser string.
Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards