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Definition(s)

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Surface Finish

Measurement of the average roughness of a surface. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards

Surface Finish

The measurement of the average roughness (RMS) of a surface. All of the surface finishes given within this specification are to be considered maximums. Source: API SPEC 16RCD, Specification for Drill Through Equipment—Rotating Control Devices, Upstream Segment, First Edition, February 2005. Global Standards

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Structure, Wrought

One that contains no cast dendritic structure. Source: API SPEC 16RCD, Specification for Drill Through Equipment—Rotating Control Devices, Upstream Segment, First Edition, February 2005. Global Standards

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Stripping Pressure Rating

A procedure for running or pulling pipe from the well bore with pressure in the annulus. Source: API SPEC 16RCD, Specification for Drill Through Equipment—Rotating Control Devices, Upstream Segment, First Edition, February 2005. Global Standards

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Static Pressure Rating

The maximum pressure that the equipment is designed to control with no pipe movement. Source: API SPEC 16RCD, Specification for Drill Through Equipment—Rotating Control Devices, Upstream Segment, First Edition, February 2005. Global Standards

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Stabilized (Temperature Testing)

State in which the initial temperature fluctuations have decreased to within the manufacturer's specified range.

• NOTE: Temperature fluctuation can be caused by such things as mixing different-temperature fluids, convection, or conduction.

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

Stabilized (Temperature Testing)

When the initial temperature fluctuations decrease to within the manufacturer’s specified range. This temperature fluctuation can be caused by such things as mixing of different temperature fluids, convection, or conduction. Source: API SPEC 16RCD, Specification for Drill Through Equipment—Rotating Control Devices, Upstream Segment, First Edition, February 2005. Global Standards

Definition(s)

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Stabilized (Pressure Testing)

State in which the initial pressure-decline rate has decreased to within the manufacturer's specified rate.

• NOTE: Pressure decline can be caused by such things as changes in temperature, setting of elastomer seals, or compression of air trapped in the equipment being tested.

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

Stabilized (Pressure Testing)

When the initial pressure decline rate decreases to within the manufacturer’s specified rate. This pressure decline can be caused by such things as changes in temperature, setting of elastomer seals or compression of trapped air in the equipment being tested. Source: API SPEC 16RCD, Specification for Drill Through Equipment—Rotating Control Devices, Upstream Segment, First Edition, February 2005. Global Standards

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Special Processes

Operations which convert or affect material properties. Source: API SPEC 16RCD, Specification for Drill Through Equipment—Rotating Control Devices, Upstream Segment, First Edition, February 2005. Global Standards

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System Rated Working Pressure

The maximum design pressure at which control fluid is stored in the accumulator assembly. 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

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Straight-Through Function

Subsea function that is directly operated by a pilot signal without interface with a podmounted pilot-operated control valve. 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

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Stored Hydraulic Fluid Volume

The fluid volume recoverable from the accumulator system between the system rated working pressure and the precharge 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

Definition(s)

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Spent Fluid

Hydraulic control fluid that is vented from a function control port when the opposite function is operated. 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

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Solenoid Valve

An electrical coil operated valve which controls a hydraulic or pneumatic function or signal. 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

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Sheave

A wheel or rollers with a cross-section designed to allow a specific size of rope, cable, wire line or hose bundle to be routed around it at a fixed bend radius that is normally used to change the direction of, and support, the line. 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

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Shear Ram BOP (Blind/Shear Rams)

Rams having cutting blades that will shear tubulars that may be in the wellbore. Shearing blind rams additionally close and seal against the pressure below. Casing shear rams are designed specifically to shear casing, and may not seal the well bore. 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

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Shared

An element or system that may be used for more than one purpose. 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

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Selector Valve

A three position directional control valve that has the inlet port blocked and the operator ports blocked in the center position. 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

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Static Seal

Seals in which no motion exists relative to sealing surfaces after installation. Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global Standards

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Specified Material

The material meeting a particular performance requirement(s) as specified by a manufacturer or industry standard. Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global Standards

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SAE

Society of Automotive Engineers. Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global Standards  

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Surface Finish (Ra)

Measurement of the average roughness of a surface. NOTE 1 It is expressed in micrometres (μm). NOTE 2 All of the surface finishes given in this American National Standard are to be considered maxima. Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global Standards

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Standard Connection

Flange, hub or studded connection manufactured in accordance with an ISO standard, including dimensional requirements. Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global Standards  

Definition(s)

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Stabilized 〈Temperature Testing〉

In a state in which the initial temperature fluctuations have decreased to within the manufacturer's specified range. NOTE Temperature fluctuation can be caused by such things as mixing of different-temperature fluids, convection or conduction. Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global Standards  

Definition(s)

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Stabilized 〈Pressure Testing〉

In a state in which the initial pressure-decline rate has decreased to within the manufacturer's specified rate. NOTE Pressure decline can be caused by such things as changes in temperature, setting of elastomer seals or compression of air trapped in the equipment being tested. Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global Standards  

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SSSV

Subsurface safety valve. Source: ISO 16530-1:2017, Petroleum and natural gas industries — Well integrity – Part 1: Life cycle governance, First Edition, March 2017. Global Standards Source: API RP 2SIM, Structural Integrity Management of Fixed Offshore Structures, First Edition, November 2014. Global Standards Source: API SPEC 14A, Specification for Subsurface Safety Valve Equipment, Eleventh Edition, October 2005 (Reaffirmed June 2012). Global Standards  

SSSV

Sub Surface Safety Valve. Source: NOGEPA Industrial Guideline No. 41, Well Construction Process Checklist, Drilling Best Practices, Netherlands, Version 0, December 2011. Global Standards Source: ISO 13702:2015, Petroleum and natural gas industries — Control and mitigation of fires and explosions on offshore production installations — Requirements and guidelines, Second Edition, August 2015. Global Standards

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SSCSV

Subsurface controlled subsurface safety valve. Source: ISO 16530-1:2017, Petroleum and natural gas industries — Well integrity – Part 1: Life cycle governance, First Edition, March 2017. Global Standards Source: API SPEC 14A, Specification for Subsurface Safety Valve Equipment, Eleventh Edition, October 2005 (Reaffirmed June 2012). Global Standards

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Sulfide Stress Cracking (SSC)

Cracking of metal involving corrosion and tensile stress (residual and/or applied) in the presence of water and H₂S. NOTE SSC is a form of hydrogen stress cracking (HSC) and involves embrittlement of the metal by atomic hydrogen that is produced by acid corrosion on the metal surface. Hydrogen uptake is promoted in the presence of sulfides. The atomic hydrogen can diffuse into the metal, reduce ductility and increase susceptibility to cracking. High strength metallic materials and hard weld zones are prone to SSC. [ISO 15156-1]. Source: API SPEC 14A, Specification for Subsurface Safety Valve Equipment, Eleventh Edition, October 2005 (Reaffirmed June 2012). Global Standards  

Sulfide Stress Cracking

Cracking of metal involving corrosion and tensile stress (residual and/or applied) in the presence of water and H₂S NOTE SSC is a form of hydrogen stress cracking (HSC) and involves embrittlement of the metal by atomic hydrogen that is produced by acid corrosion on the metal surface. Hydrogen uptake is promoted in the presence of sulfides. The atomic hydrogen can diffuse into the metal, reduce ductility and increase susceptibility to cracking. High strength metallic materials and hard weld zones are prone to SSC. [ISO 15156-1:2009, definition 3.23] 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

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Stress Cracking

Stress corrosion cracking, or sulfide stress cracking, or both. NOTE Adapted from NACE MR0175: Jan 2003. Source: API SPEC 14A, Specification for Subsurface Safety Valve Equipment, Eleventh Edition, October 2005 (Reaffirmed June 2012). Global Standards