Tubing is used as a fluid or liquid injection pipe.Usually pipe OD ≤ 2-1/16″（52.4mm）we called small-sizes tubing , which is mainly used for water injection, oil recovery and oil gas recovery.
OCTG Tubing has many different types,the main types can classify in three aspects ,they are shown as below:
(1) API: NU (Non-upset with coupling); EU (External upset with coupling); IJ (integral joint without Coupling)
(2)Non-API: KY-IJ (KPE extreme-line without coupling); KY-FJ (KPE extreme-line without coupling with gas sealed), etc.
The Standards of API Tubing include API SPEC 5CT and API SPEC 5B.The features of this kind product is shown as below:
(1)Ranking of joint OD size:EU＞NU＞IJ＞CB-IJ＞CB-FJ；
(2)Ranking of joint ID size:CB-IJ=EU=NU＞CB-FJ＞IJ；
(3)Ranking of joint connection strength:EU＞IJ＞CB-IJ＞NU＞CB-FJ；
All in all the performance of the small size tubing depends on the size of the pipe body (OD, WT), Grade, etc. It has high performance,if you need you can contact with my company.