RockySea petro : What does API 5CT mean?

API 5CT is a standard set by the American Petroleum Institute (API) that defines the specifications for steel casing and tubing used in oil and gas wells. This standard provides guidance on the material, dimensions, tolerances, and other technical requirements for steel pipes intended for such applications. It ensures that the casing and tubing used in oil wells are of consistent quality and meet the necessary safety and performance criteria. By following the API 5CT specification, drillers and operators can rely on the quality and performance of the steel casing and tubing they are using, knowing that they meet the industry standards.

Here are some specifications for API 5CT:

Length ranges
Shorter tubing joints (pup joints) are available in 2-, 3-, 4-, 6-, 8-, 10-, and 12-ft lengths with a tolerance of ± 3 in.

Grades
API 5CT L80 casing and tubing include grades L80-1, L80 9Cr (Cr 8%-10%), L80 13Cr (Cr 12%-14%), L80. It has a minimum tensile strength of 655 Mpa and a yield strength of 552 Mpa to 655 Mpa.

Steel material
The steel material used for making the pipe billet shall undergo grain refining treatment. This steel shall contain one or more grain refining elements, such as a certain amount of aluminum, niobium, vanadium, or titanium.

Connections
API Spec 5CT includes an illustration of API tubing joint connections. All three connections have tapered and round thread forms with either 8 or 10 threads/in., depending on the size.

Pipe sizes
API 5CT pipes vary in diameter, wall thickness, and length. The outer diameter ranges from 6mm to 219mm, the wall thickness ranges from 1mm to 30mm, and the length ranges up to 12000mm.