API 5CT is a standard technical specification for steel tubes for casing and tubing used in the oil and gas industry and was developed by the American Petroleum Institute for casing and tubing.
In the field of exploration, transportation and production of water, gas and oil in oil and gas, API spec 5CT casing can provide guarantee for the safe exploitation of underground resources, ensure the safety of oil and gas well construction and maintenance, and greatly improve efficiency and reliability. It is also provide structural support for well walls.
API 5CT Specification
Casing drift size plays an important role in well design and operation.
In the API 5CT size table, pipes are named according to the size of the label and the size (outside diameter). The outer diameter of the thickened pipe is the outer diameter of the pipe body, not the outer diameter of the thickened part.
API 5CT Sizes and Grades
External dimensions: 6.0 mm to 219.0 mm
Wall thickness: 1.0 mm to 30 mm
Length: 0 to 12,000 mm
API 5CT casing and tubing wall thickness tolerances are -12.5%.
As a rule, piping should be supplied in accordance with the dimensions, wall thickness and tolerance quality specified in the customer’s order.
PANDAPIPE, trusted steel pipe wholesale manufacturer and partner, can supply flat-ended tubes of other sizes and wall thicknesses according to the purchase agreement.
Classification of API 5CT
API 5CT grades refers to the yield strength of the product, in general, it covers the following major steel grades, API 5CT N80, API 5CT H40, API 5CT L80, API 5CT K55, API 5CT P110 and API 5CT J55.
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First, API spec 5CT H40 has a low yield strength and is generally not suitable for dimensional design of pipes. -
API spec 5CT J55 Standard specification grade for tubing used in shallow, low-pressure environments on land. -
API spec 5CT K55 is similar to API 5CT J55 in that the minimum tensile strength of API 5CT K55 steel pipe is higher. -
API spec 5CT M65 is widely used in oil and gas well drilling, oil and gas transportation and so on. -
And the last, API spec 5CT N80 (1,Q) grade is older and has largely open chemical requirements and is commonly used in low-sulfur oil and gas Wells.
API 5CT Pipeline Connection
|
Type of Steels |
Yield Strength, Mpa |
Tensile Strength, Mpa |
|
API 5CT N80 |
552 to 758 |
689 |
|
API 5CT H40 |
276 to 552 |
414 to 60,000 psi min. |
|
API 5CT L80 |
552 to 655 |
655 |
|
API 5CT K55 |
655 |
517 |
|
API 5CT P110 |
758 to 965 |
862 |
|
API 5CT J55 |
379 to 552 |
517 |
API 5CT steel pipe is suitable for the following pipe connections that comply with API SPEC 5B.
non-upset tubing (NU);
short round thread casing (STC);
long round thread casing (LC);
buttress thread casing (BC);
ntegral joint pipe (IJ);
extreme-line sleeve (XC);
external upset tubing (EU)
This international standard specifies the API spec 5CT technical delivery conditions for joint and thread protection for such connections.
API 5CT Mechanical Properties
Conclusions can be drawn from the contents of the table, API spec 5CT casing and tubing multiple grades of casing are designed for use in a variety of environments and geology, offering excellent tensile properties and the ability to withstand extreme pressures.
As a result, API 5CT casing and tubing’s range of casing materials is ideal for use in different geological environments.
In the process of oil and gas production, the selection of the right pipe is crucial to control economic costs and ensure the safety and efficiency of the operation. On the other hand, API spec 5CT casing and tubing can help optimize well design and operation, protect the environment, and ensure operator safety.
