API 5CT P110 Casing and Tubing Pipe

API 5CT P110 casing and tubing pipe represents one of the highest grades of API 5CT steel pipes, specifically engineered for the demanding requirements of deep oil and gas wells. Compared with J55, K55, N80, L80, and T95 grades, P110 provides significantly greater mechanical strength and enhanced resistance to downhole stresses. It is defined by a minimum tensile strength of 862 MPa and a yield strength range of 758–965 MPa, placing it among the most robust tubular products in the oilfield industry, it is widely used for oil drilling and producing in a particular surroudings especially for a deep oil well.

In accordance with API 5CT specifications, P110 casing is identified with a white band at the pipe ends, signifying its superior strength classification. This grade is particularly suited for high-pressure, high-temperature (HPHT) drilling operations, sour service conditions, and wells with complex geological formations. By offering a reliable balance of toughness, resistance to collapse, and structural integrity, API 5CT P110 ensures safe and efficient production performance even in the harshest downhole environments.

 

API 5CT P110 manufacturing types

P110 casing and tubing could be made by welded ERW or seamless and in most cases seamless type is adopted.

Heat treatment types for P110 pipes

P110 pipes shall be heat treated with full-body, full-length, as per API 5CT 10th edition quenched and tempered (simplified with Q) shall be adopted to the products. Normalized (N) or normalized and tempered (N&T) is not applicable for P110 casing and tubing.

Special chemical requirements for ERW P110 pipe are specified in Table E.4 in API 5CT, and other requirements specified in A.6 SR11.

Heat treatment is required for P110 grade,

Reference Inspection for P110 Casing and Tubing

Visual inspection for pipe surface
Dimension check
NDT test including Magnetic particle, Ultrasonic Test, Hydrostatic Test
Drift test
Chemical analysis
Mechanical test on tensile strength, yield strength and elongation
Charpy impact test
Flattening tests
Hardness test
Thread ends check with thread gauge and coupling check

API 5CT P110 Casing:

P110 Casing is installed downhole to provide structural integrity to the wellbore and must withstand external-collapse pressure from rock formations and internal-yield pressure from fluid and gas. It needs to bear its own weight and withstand the torque and transaxial pressure placed on it while running downhole. Casing is considered as a pipe pile that will stabilize the oil well.

API 5CT P110 Tubing:

P110 Tubing is installed inside the casing. It is used to transport (pump) crude oil or natural gas from the source rock to the ground wellhead. Inside tubing is sucker rods, where used for pumping oil and gas.

Chemical Composition

 

For seamless P110 pipe, only limits phosphorus and sulfer content 0.03%, and in case welded type, maximum P 0.02% and S 0.01%. Other chemical composition like C, Si, Mn, Mo, Cr no limits.

Mechanical Properties

 

Connection type, ends and Couplings

Casing and tubing ends type are different where for casing usually BTC and tubing with EUE or NU. 

P110 casing pipe connection types

Common use connection BTC, buttress thread marked with BC
LC: Long round thread
SC: Short round thread
Premium connections like HYD, and other gas tight thread
Customized connection threads as per client requirement

P110 tubing connections with regulare and special clearance

EUE: External upset, tubing ends have an exeternal upset with a larger diameter and thickness than tubing body
NU: Non upset, tubing ends same diameter and thickness with tubing body

Dimension and tolerances

Length Range:

R1: 4.88 to 7.62 meters, permissible variation max 1.83 meters, and permissible length min 5.49 meters.
R2: 7.62 to 10.36 meters.
R3: 10.36 to 14.63 meters.

Outer diameter tolerance:

For pipes below 4-1/2 inch, tolerances +/- 0.79mm or 0.031 inch
For pipes equal and above 4-1/2 inch, tolerances +1% and -0.5% of pipe diameter

Wall thickness tolerance – 12.5%.

Imperfections:

Maximum permissible depth of linear imperfections, external and internal imperfections 12.5 of wall thickness. In case required 5% also could be adopted for P110 grade.

Octal supply range for P110 casing and tubing

Standards: API SPEC 5CT P110 Casing and Tubing
Grades: P110
Stock Available: Yes
Manufacturing process: Seamless, ERW
P110 Casing and Tubing Outer Diameter: 2-3/8”, 2-7/8”, 3-1/2”, 4-1/2”, 5-1/2”, 6-5/8”, 7”, 7-5/8”, 7-3/4”, 8-5/8”, 9-5/8”, 10-3/4”, 11-3/4”, 13-3/8”, 16”, 18-5/8”, 20”
Thickness: 4 LB/FT to 106.59 LB/FT, 0.244” to 0.875”
Coupling thread: BTC, Buttress (Regular, Special bevel or special clearance), LTC,  STC, premium connections threads.
Length: R1, R2, R3, customized

In Summary

In modern oilfield operations, the choice of casing and tubing directly influences well integrity, production efficiency, and long-term economic returns. With its superior tensile and yield properties, API 5CT P110 casing and tubing pipe stands out as the optimal solution for deep and challenging drilling projects. Its proven ability to withstand high stress, corrosive elements, and geological unpredictability makes it indispensable for safe hydrocarbon recovery.

As a trusted supplier, Octal Steel provides fully certified API 5CT P110 casing and tubing pipes, complete with inspection reports, mill test certificates (MTC), and full traceability. By adhering to international standards and implementing strict quality control, Octal Steel ensures that every pipe delivers both mechanical reliability and operational confidence. For oil and gas companies seeking dependable tubular solutions, Octal Steel’s P110 products offer not only material strength but also a foundation for long-term field success.

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