Torn Threads

Torn Threads

Definition(s)

Torn Threads (Tears)

Thread crests which have portions that are chipped, rough, or ragged. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards
Tool Marks

Tool Marks

Definition(s)

Tool Marks

Surface roughness on thread, chamfer, or counterbore surfaces caused by the machining action and condition of the cutting edge of single-point, die, or chaser tools; also can occur in the form of a longitudinal ridge across thread crests due to an improperly shaped or adjusted chaser. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards
Subsurface Discontinuity

Subsurface Discontinuity

Definition(s)

Subsurface Discontinuity (or Imperfection)

Any discontinuity that does not open to the surface (either ID or OD). Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards
Stress

Stress

Definition(s)

Stress

Load per unit area. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards
Skip

Skip

Definition(s)

Skip

Path of the ultrasonic beam in the OCTG from the point of entry on the surface to the back surface and reflecting to the front surface again. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards  

Skip

“Skip” means a stage, cage, basket or wet bell in which a diver may be lowered to or raised from an underwater work site (skip). Source: Canada Oil and Gas Diving Regulations, SOR/88-600, February 2013. Regulations Source: Nova Scotia Offshore Area Petroleum Diving Regulations, SOR/95-189, Canada, current to May 31, 2012. Regulations
Skelp

Skelp

Definition(s)

Skelp

Coil or strip of metal produced to a certain thickness, width, and edge configuration from which welded pipe is made. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards  

Skelp

Hot-rolled steel strip used for manufacturing EW pipe. Source: API SPEC 5CT, Specification for Casing and Tubing, Upstream Segment, Ninth Edition, July 2011 (Errata September 2012). Global Standards
Zero

Zero

Definition(s)

Zero

Act of setting a dial indicating depth gauge for "zero depth". Past tense is "zeroed". Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards
Shoe

Shoe

Definition(s)

Shoe

See Detector Shoe. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards
Residual Field

Residual Field

Definition(s)

Residual Field

Remaining magnetic field retained by ferromagnetic materials after they have been exposed to a magnetic force. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards
Recommended Practice

Recommended Practice

Definition(s)

Recommended Practice (RP)

Standard to facilitate the broad availability of proven sound engineering and operating. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards  

Recommended Practice (RP)

The recommended practice publications cover proven technology and solutions which have been found by DNV to represent good practice, and which represent one alternative for satisfy the requirements stipulated in the DNV offshore standards or other codes and standards cited by DNV. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards  
Readout

Readout

Definition(s)

Readout

Device that visually indicates a condition, voltage, or current. Typical devices used in inspection requirements are galvanometers and CRTs. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards  
Radioisotope

Radioisotope

Definition(s)

Radioisotope

Unstable isotope of an element that disintegrates spontaneously, emitting radiation. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards  
Pulse Duration

Pulse Duration

Definition(s)

Pulse Duration

Time from initial current flow until the magnetization current has decayed to one-half the  peak magnitude. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards  
Relieving Conditions

Relieving Conditions

Definition(s)

Relieving Conditions

Inlet pressure and temperature on a pressure-relief device during an overpressure condition.
  • NOTE: The relieving pressure is equal to the valve set pressure (or rupture disk burst pressure) plus the overpressure. The temperature of the flowing fluid at relieving conditions can be higher or lower than the operating temperature.
Source: API STD 521, Pressure-relieving and Depressuring Systems, Sixth Edition, January 2014. Global Standards Source: API STD 521, Pressure-relieving and Depressuring Systems, Fifth Edition, January 2007 (Addendum May 2008). Global Standards
Process Capability

Process Capability

Definition(s)

Process Capability

Ability of a process or NDT method to repeatedly detect a defect under normal conditions of variability. Sometimes related to confidence level. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards  
Probe

Probe

Definition(s)

Probe

Transducer or search unit. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards  
Nonrelevant Indication

Nonrelevant Indication

Definition(s)

Nonrelevant Indication

Magnetic particle indications that can occur singly or in patterns as a result of leakage fields created by conditions that require no evaluation such as changes in section (like keyways and drilled holes), inherent material properties (like the edge of a bimetallic weld), magnetic writing, etc. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards  
Mill Grind

Mill Grind

Definition(s)

Mill Grind

Area of the OCTG surface removed by grinding during the manufacturing process. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards  
Relief Valve

Relief Valve

Definition(s)

Relief Valve

A device that is built into a hydraulic or pneumatic system to relieve (dump) any excess pressure. Source: API SPEC 16D, Specification for Control Systems for Drilling Well Control Equipment and Control Systems for Diverter Equipment, Upstream Segment, Second Edition, July 2004. Global Standards  

Relief Valve

Spring-loaded pressure-relief valve actuated by the static pressure upstream of the valve, which normally opens in proportion to the pressure increase over the set pressure.

NOTE A relief valve is normally used with incompressible fluids.

Source: API STD 521, Pressure-relieving and Depressuring Systems, Sixth Edition, January 2014. Global Standards

Relief Valve

Spring-loaded pressure-relief valve actuated by the static pressure upstream of the valve, due to which the valve normally opens in proportion to the pressure increase over the opening pressure.
  • NOTE: A relief valve is normally used with incompressible fluids.
Source: API STD 521, Pressure-relieving and Depressuring Systems, Fifth Edition, January 2007 (Addendum May 2008). Global Standards  

Relief Valve

Valve specifically designed to protect a line or vessel from exceeding MAOP by relieving to atmosphere or a tank. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Magnetism

Magnetism

Definition(s)

Magnetism

Ability of a magnet to attract or repel another magnet is called magnetism. Also recognized as a force-field surrounding conductors carrying electric current. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards  
Magnetic Poles

Magnetic Poles

Definition(s)

Magnetic Poles

Area on a magnetized OCTG where the magnetic field is "leaving or returning", usually at its end when longitudinally magnetized. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards  
Magnetic Field

Magnetic Field

Definition(s)

Magnetic Field

Space around a magnet within which ferromagnetic materials are attracted is called a magnetic field. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards  
Lift Off

Lift Off

Definition(s)

Lift Off

Apparent separation of a stable or unstable flame above the flare burner, occurring if the fuel velocity exceeds the flame velocity.

Source: API STD 521, Pressure-relieving and Depressuring Systems, Sixth Edition, January 2014. Global Standards

Lift Off

Perpendicular distance between detector shoe and the surface - sometimes called "standoff". Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards
Relief Gas or Flared Gas or Waste Gas or Waste Vapour

Relief Gas or Flared Gas or Waste Gas or Waste Vapour

Definition(s)

Relief Gas or Flared Gas or Waste Gas or Waste Vapour

Gas or vapour vented or relieved into a flare header for conveyance to a flare. Source: API STD 521, Pressure-relieving and Depressuring Systems, Fifth Edition, January 2007 (Addendum May 2008). Global Standards  
Leaker

Leaker

Definition(s)

Leaker

Length of OCTG that will not hold hydrostatic pressure. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards  
Isotope

Isotope

Definition(s)

Isotope

Atoms with the same atomic number (same chemical element) but different atomic weights. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards  
Handling Tight

Handling Tight

Definition(s)

Handling Tight

Sufficiently tight so that the coupling cannot be removed except by use of a wrench. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards Source: API SPEC 5CT, Specification for Casing and Tubing, Upstream Segment, Ninth Edition, July 2011 (Errata September 2012). Global Standards  
Hand-Tight Standoff

Hand-Tight Standoff

Definition(s)

Hand-Tight Standoff

Length, at hand-tight engagement from the face of the coupling to the vanish point of the  threads for round threads and the base of the triangle for buttress threads. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards  
Hand-Tight

Hand-Tight

Definition(s)

Hand-Tight

Threaded joint that has been made-up by hand without the aid of tongs. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards  
Rated Relieving Capacity

Rated Relieving Capacity

Definition(s)

Rated Relieving Capacity

Relieving capacity used as the basis for the application of a pressure-relief device, determined in accordance with the pressure-design code or regulation and supplied by the manufacturer. NOTE The capacity marked on the device is the rated capacity on steam, air, gas or water as required by the applicable code. Source: API STD 521, Pressure-relieving and Depressuring Systems, Fifth Edition, January 2007 (Addendum May 2008). Global Standards  

Rated Relieving Capacity

Flow capacity of a relief device expressed in terms of air flow at standard or normal conditions at a designated pressure or vacuum. NOTE Rated relieving capacity is expressed in SCFH or Nm3/h. Source: API STD 2000, Venting Atmospheric and Low-pressure Storage Tanks, Sixth Edition, November 2009. Global Standards