API SPEC 5ST
Specification for Coiled Tubing U.S. Customary and SI Units
|Publication Date:||1 April 2010|
This specification covers the manufacturing, inspection, and testing of all carbon and low alloy steel coiled tubing in Grades CT70, CT80, CT90, CT100 and CT110, in the designations and wall thicknesses given in Table A.5, that can be used as work strings, completion strings, and static installations in oil and gas wells. Coiled tubing may be ordered to this specification.
Coiled tubing is manufactured using the continuously milled process. This specification does not cover the joining of seamless or welded tubing segments in lengths less than 200 ft (61 m).
Tubing of a higher grade is not be substituted for tubing ordered as a lower grade without purchaser approval.
In the dimensional tables herein, coiled tubing is designated by outside diameter, expressed to the thousandth of an inch (0.1 mm), with OD sizes ranging from 0.750 in. (19.1 mm) through 3 ½ in. (88.9 mm).
Both U.S. Customary units and SI units are shown in this document. Annex H covers specific information about conversion factors and rounding procedures.
The suitability of the coiled tubular products made to this specification for use in environments containing hydrogen sulfide (H2S) is outside of the scope of this document. It is the responsibility of the purchaser (and/or the user) of coiled tubing to determine the level of resistance to sour service damage mechanisms such as sulfide stress cracking necessary for the end use of the tubing.