API Spec 5ST:2010 pdf download

API Spec 5ST:2010 pdf download.Specification for Coiled Tubing.
NOTE Grain size is usually estimated or measured on the cross-section of an aggregate of grains. Average size of grains in the metal usually expressed as an average diameter or grams per unit area or volume.
flash
A thin fin or web of metal formed at the joining edges of a weld when a small portion of metal is extruded during the high frequency induction seam-forming process. A flash extends above the plane of the OD surface or the plane of the ID surface.
3.12
flash-In
The condition in which the internal flash from the seam welding process is left inside the tubing.
3.13
gouge
Elongated grooves or cavities caused by mechanical removal of metal.
3.14
heat-affected zone
HAZ
The zone directly adjacent to the weld fusion zone in a longitudinal seam weld, circumferential tube-to-tube weld and skeip-end weld. The mechanical properties in the HAZ are affected by the heat produced during the welding process.
3.15
high frequency induction welding
HFI
A welding process used to form a longitudinal seam along the length of the milled tube. As the edges of the skelp are passed through a high-frequency induction coil, the edges of the skeip are heated through the resistance to flow of current.
3.16
imperfection
A discontinuity in the product wall or on the product surface that can be detected by the nondestructive evaluation
(NDE) methods.
3.17
Inclusion
Particles of nonmetallic impurities, usually oxides, sulfides. and silicates that are mechanically held within steel after
solidification.
3.18
killed steel
Steel deoxidized with certain deoxidizing elements, such as aluminum, silicon, etc. The term “killed” is used because such additions cause the steel to lie quietly in the molds during solidification.
3.19
lamination
An internal metal separation creating layers generally parallel to the surface.
3.20
linear imperfection
Linear irregularities, which indude, but are not limited to, seams, laps, cracks, cuts, and scores.
3.21
manufacturer
A firm, company, or corporation responsible for making and marking the product in accordance with this specification.
The manufacturer is responsible for compliance with all of the applicable provisions of this specification.
3.22
master coil
The original wide coil of steel that is supplied by the steel manufacturer and is subsequently slit into several narrower coils of skelp of the appropriate width for the manufacture of coiled tubing.
3.23
mill stop
An interruption in the normal production of the seam welding of a string.
3.24
milled length
A single length of coiled tubing created during continuous operation of a mill.
NOTE A milled length can include tubing manufactured from a number of coils of skeip. The lengths of skelp can have a single specified wall thickness, or can have various specified wall thicknesses. A milled length does not include tube-to-tube welds.
3.25
normalize
A heat treatment of steel whereby the steel is heated to a temperature above the upper critical temperature to achieve
transformation to austenite then allowed to cool in air to a temperature substantially below the lower critical
temperature.
3.26
ovality
Defined herein as 2(D,,, — Dmin)/(D,. + Dmr) where D, and Dmin are the measured diameters at a specific location along the tubing, and may be expressed as a percentage.
3.27
processes requiring validation
Certain operations performed during skelp joining and tube manufactunng that affect attribute compliance required in this document (except chemistry and dimensions) shall have their processes validated.