Tubing Grade and Connection Type Chart

Tubing grade and connection type are relevant guidelines that help the industry understand the concept and process of tubing. Tubing grade is a grade that follows the international standards recommended by the  American Petroleum Institute (API) for the purpose of manufacturing, designing, and installing gas and oil pipelines.  Aside from this, tubing connections are widely used because of their serviceable and excellent performance.

Tubing Grade and Connection Type: Application

It is also important to know the functions of the various tubing connections and tubing grade.  This way, you will know which type fits best in different settings. As per API standards, there are three types of connection tubing:

• Integral-joint tubing – It has a 10-round form along with a joint strength that measures less compared to its minimum body yield.
• External-upset tubing and coupling – This is globally utilized, as it works efficiently with wells and is considered 100% excellent with joint connections. For sealing and lubrication enhancements, it requires the thread compound as mentioned by API RP 5A3.
• Non-upset tubing and coupling – This type offers great advantage, as the diameter is less which is perfect for small clearance. Sizes are available from 1.050 to 4.500.

API standards must be followed all the time. These guidelines are used by the industry:

• T-95 is typically used for sour services and has a higher quality compared to C90
• H40 has low yield strength and is not utilized for tubing sizes
• C-75 is the only tubing grade which is no longer used as it fails to meet API standards

Tubing Grade and Connection Type Benefits

With the kind of connection and tubing grade, the tubing process is superior compared to piping. Tubing can be installed and maintained effortlessly. It takes 12 minutes to install a one-inch tubing system, while a pipe system needs at least 48 minutes. As the process requires less time, the cost is also affected. This means the tubing system is cheaper.

Tubing Grade and Connection Type Chart

 

Tubing Grade and Connection Type Chart Abbreviations:

• T & C – Threaded and Coupled Ends
• in – Inches
• mm -millimeter
• lb/ft – pounds per feet
• kg/m – kilogram per meter
• OD – Outer Diameter
• Wall Thkns – Wall Thickness

Metrication of Dimensions and Weight

• O.D X 25.4 = mm
• I.D x 25.4 = mm Wall x 25.4 = mm
• Lbs./ft. x 1.488 = kg/meter

Grade Types

• J-55 is more effective in wells with low and shallow pressure
• L-80 has various kinds such as 13 CR, 1 and 9 CR
• N80 is commonly utilized in gas and sweet oil wells
• C90 is a recently developed grade with two types
• P110 works for deep wells but are inefficient for sour condensate wells

Selecting the Right Tubing Grade and Connection for Your Production Requirements

Choosing the appropriate tubing grade and connection type requires careful evaluation of wellbore conditions, production fluid characteristics, pressure and temperature profiles, and long-term well performance objectives. The charts above provide comprehensive specifications for API tubing grades and connection types, enabling production engineers and completion designers to match tubing specifications to specific well environments—from shallow low-pressure wells using economical J-55 tubing to deep high-pressure wells requiring P-110 grade material. Connection type selection is equally critical, as integral-joint tubing offers compact outside diameter for restricted clearances, external-upset tubing (EUE) provides superior joint strength and sealing performance for demanding applications, and non-upset tubing (NUE) maximizes internal drift diameter for wireline operations and artificial lift installations. Understanding the relationship between tubing grade metallurgy, connection design, and downhole conditions ensures reliable production performance while avoiding premature failures from corrosion, fatigue, or inadequate pressure ratings.

Flowtech Energy maintains inventory of API 5CT certified tubing in all standard grades and connection types to support conventional oil and gas production, thermal recovery operations, and specialized applications including sour service and CO2 injection wells. Our procurement team sources tubing with appropriate metallurgy for corrosive environments—including L-80 13Cr for CO2 service, C-90 and T-95 for H2S environments, and standard grades for sweet production where corrosion resistance is not critical. We provide both new premium tubing and inspected used tubing that has been evaluated for remaining service life, thread condition, and dimensional compliance with API specifications. Whether you’re completing new wells, performing tubing change-outs during workovers, or replacing corroded tubing in aging fields, our technical team can assist with grade selection based on fluid analysis, pressure ratings, and compatibility with existing wellhead and surface equipment. If you need assistance interpreting tubing grade specifications for corrosive or high-pressure environments, sourcing certified tubing with complete material traceability, or coordinating delivery and field support for completion operations, contact Flowtech Energy at 1-877-645-6693. We deliver expert technical guidance and reliable supply chain support—ensuring your wells are equipped with properly specified tubing that provides safe, efficient production performance throughout the life of your assets.

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