HAZ

HAZ

Definition(s)

HAZ

Portion of the base metal that has not been melted, but whose mechanical properties or microstructure has been altered by the heat of welding or cutting. 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

HAZ

Heat-affected zone. Source: API Standard 2CCU, Offshore Cargo Carrying Units, First Edition, August 2017. Global Standards 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 Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards Source: API SPEC 7K, Drilling and Well Servicing Equipment Upstream Segment, Fifth Edition, June 2010 (August 2010). Global Standards Source:API SPECIFICATION 7K, Drilling and Well Servicing Equipment, Sixth Edition, December 2015. Global Standards Source: API SPEC 8C, Drilling and Production Hoisting Equipment (PSL 1 and PSL 2), Fifth Edition, April 2012. Global Standards Source: API SPEC 17J, Specification for Unbonded Flexible Pipe, Third Edition, July 2008. Global Standards Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global Standards Source: API SPEC 16RCD, Specification for Drill Through Equipment—Rotating Control Devices, Upstream Segment, First Edition, February 2005. Global Standards Source: ISO 21457:2010, Petroleum and natural gas industries — Materials selection and corrosion control for oil and gas production systems, First Edition,September 2010. Global Standards  

HAZ

Heat affected zone (welding). Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global Standards
DAC

DAC

Definition(s)

DAC

Defined limits placed on characteristics of materials, products, or services established by the organization, customer, and/or applicable specifications to achieve conformity to the product design. Source: API SPEC Q1, Specification for Quality Management System Requirements for Manufacturing Organizations for the Petroleum and Natural Gas Industry, Ninth Edition, June 2013 (Errata 2, March 2014). Global Standards

DAC

Design acceptance criteria. Source: API SPEC Q1, Specification for Quality Management System Requirements for Manufacturing Organizations for the Petroleum and Natural Gas Industry, Ninth Edition, June 2013 (Errata 2, March 2014). Global Standards  

DAC

Distance amplitude curve. 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 Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards
AQL

AQL

Definition(s)

AQL

Acceptance quality level. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards

AQL

Acceptable quality level. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global Standards  

AQL

Acceptance quality limit. Source: API SPEC 11D1, Packers and Bridge Plugs, Upstream Segment, Second Edition, July 2009. Global Standards Source: API SPEC 14A, Specification for Subsurface Safety Valve Equipment, Eleventh Edition, October 2005 (Reaffirmed June 2012). Global Standards
Wrought Structure

Wrought Structure

Definition(s)

Wrought Structure

Structure that contains no cast dendritic structure. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards

Wrought Structure

Structure that contains no cast dendritic elements. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global Standards
Wrought Product

Wrought Product

Definition(s)

Wrought Product

Structure that contains no cast dendritic elements.

Source: API Specification 20E, Alloy and Carbon Steel Bolting for Use in the Petroleum and Natural Gas Industries, Second Edition, February 2017. Global Standards

Wrought Product

Product made from material having a wrought structure. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards
Wing Valve

Wing Valve

Definition(s)

Wing Valve

Valve located on the christmas tree, but not in the vertical run, which can be used to shut off well flow. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards
Welding Neck Flange

Welding Neck Flange

Definition(s)

Welding Neck Flange

Flange with a neck on the side opposite the sealing face, prepared with a bevel to weld to corresponding pipe or transition pieces. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards  
Weld, Verb

Weld, Verb

Definition(s)

Weld, Verb

Fuse materials, with or without the addition of filler materials. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards  

Weld, Verb

Act of fusing materials, with or without the addition of filler materials. 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 Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global Standards
Weld Preparation

Weld Preparation

Definition(s)

Weld Preparation

Geometry of surfaces for the purpose of welding. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards
Volumetric Non-Destructive Examination or Volumetric NDE

Volumetric Non-Destructive Examination or Volumetric NDE

Definition(s)

Volumetric Non-Destructive Examination or Volumetric NDE

Examination for internal material defects by methods such as radiography and/or ultrasonic testing. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards  
Visual Examination

Visual Examination

Definition(s)

Visual Examination

Examination of parts and equipment for visible defects in material and workmanship. Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global Standards Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global Standards Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global Standards Source: API SPEC 17J, Specification for Unbonded Flexible Pipe, Third Edition, July 2008. Global Standards
Venturi Valve

Venturi Valve

Definition(s)

Venturi Valve

Valve with a reduced opening, in which the transformation from the full-opening ends to the reduced-closure area is well streamlined to reduce pressure loss. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards
Valve-Removal Plug

Valve-Removal Plug

Definition(s)

Valve-Removal Plug

Threaded plug that can be installed in the wellhead to enable gate-valve removal under pressure. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards  
Valve-Bore Sealing Mechanism

Valve-Bore Sealing Mechanism

Definition(s)

Valve-Bore Sealing Mechanism

Internal valve parts that close off the flow through the valve bore. EXAMPLES Gates, balls, plugs, poppets, flappers and their respective seats Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards  
Underwater Safety Valve (USV)

Underwater Safety Valve (USV)

Definition(s)

Underwater Safety Valve (USV)

Automatic valve assembly installed at an underwater wellhead location which closes on loss of power supply. NOTE Where used in this International Standard, the term is understood to include a USV valve and USV actuator. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards
Tubing-Head Spool

Tubing-Head Spool

Definition(s)

Tubing-Head Spool

Piece of equipment attached to the uppermost casing head or smallest casing string which serves to suspend the tubing and to seal the annular space between the tubing and casing. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards
Tubing-Head Adapter

Tubing-Head Adapter

Definition(s)

Tubing-Head Adapter

Equipment that adapts the uppermost connection of a tubing head to the lowermost valve of the christmas tree. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards
Tubing Hanger Mandrel

Tubing Hanger Mandrel

Definition(s)

Tubing Hanger Mandrel

Mechanism used to support a tubing string in a tubing head by means of a male or female thread attached to the tubing. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards
Top Connector or Bottomhole Test Adapter

Top Connector or Bottomhole Test Adapter

Definition(s)

Top Connector or Bottomhole Test Adapter

Uppermost fitting of a christmas tree which allows full-bore access to the christmas tree. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards
Threaded Flange

Threaded Flange

Definition(s)

Threaded Flange

Flange having a sealing face on one side and a female thread on the other for the purpose of joining flanged connections to threaded connections. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards
Test And Gauge Connection

Test And Gauge Connection

Definition(s)

Test And Gauge Connection

Hole drilled and tapped into wellhead and christmas tree equipment through which internal pressure can be measured or through which pressure can be applied to test the sealing mechanisms. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards
Test Agency

Test Agency

Definition(s)

Test Agency

Independent third party that provides a test facility and administers a testing programme that meets the class II SSV/USV valve-validation testing requirements of Annex I of this International Standard and API Spec 6AV1. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards  

Test Agency

Organization which provides a test facility and administers a test program that meets the validation test requirements of this International Standard. NOTE See Annex A for test agency requirements. Source: API SPEC 14A, Specification for Subsurface Safety Valve Equipment, Eleventh Edition, October 2005 (Reaffirmed June 2012). Global Standards
Tee

Tee

Definition(s)

Tee

Pressure-containing fitting with three openings. NOTE Two openings opposite one another form the run portion of the tee, and one opening is at 90° to the line of the run. Tees may be equipped with threads, flanges, studs or other end connectors. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards  
Swab Valve or Crown Valve

Swab Valve or Crown Valve

Definition(s)

Swab Valve or Crown Valve

Uppermost valve on the vertical bore of the christmas tree above the flowline outlet. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards
Surface Safety Valve or SSV

Surface Safety Valve or SSV

Definition(s)

Surface Safety Valve or SSV

Automatic wellhead valve assembly that closes upon loss of power supply. NOTE Where used in this International Standard, the term is understood to include an SSV valve and SSV actuator. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards
Substantive Change

Substantive Change

Definition(s)

Substantive Change

Change that potentially affects the performance or rating of the tool in the intended service as evaluated by a qualified person at the supplier/manufacturer.

Source:API SPECIFICATION 19TT, Specification for Downhole Well Test Tools and Related Equipment, First Edition, October 2016. Global Standards

Substantive Change

Change identified by the manufacturer that affects the performance of the product in the intended service. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards
Studded Connection

Studded Connection

Definition(s)

Studded Connection

Flanged end or outlet connection in which thread-anchored studs screwed into tapped holes replace the holes for bolt studs. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards  

Studded Connection

Connection in which thread-anchored studs are screwed into tapped holes. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global Standards
Stress-Corrosion Cracking

Stress-Corrosion Cracking

Definition(s)

Stress-Corrosion Cracking

Cracking that results from a combination of corrosion and stress. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards
Stress Relief

Stress Relief

Definition(s)

Stress Relief

Controlled heating of material to a predetermined temperature for the purpose of reducing any residual stresses after welding. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global Standards  

Stress Relief

Controlled heating of material to a predetermined temperature for the purpose of reducing any residual stresses. 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 Source: API SPEC 14A, Specification for Subsurface Safety Valve Equipment, Eleventh Edition, October 2005 (Reaffirmed June 2012). Global Standards Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global Standards Source: API SPEC 16RCD, Specification for Drill Through Equipment—Rotating Control Devices, Upstream Segment, First Edition, February 2005. Global Standards
Stainless Steel

Stainless Steel

Definition(s)

Stainless Steel

Steel containing more than 11 % mass fraction chromium to render the steel corrosion resistant. NOTE Other elements may be added to secure special properties. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards  

Stainless Steel

Steel containing chromium, more than 11%, to render the steel corrosion resistant. Other elements may be added to secure special properties. Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global Standards