API 5CT L80 Casing Pipe Size

Date:2024-11-15Tags:casing pipe,Casing and Tubing,Steel casing pipe

Introduction

API 5CT is a commonly used oil well pipeline technical standard in the oil and gas industry, which provides strict specifications for the production, inspection and application of casing and tubing. As one of the important grades, API 5CT L80 casing pipe enjoys a high reputation in the industry for its excellent corrosion resistance and mechanical strength. This article will comprehensively analyze the characteristics, specifications, production process and application areas of API 5CT L80 casing pipe to provide users with a clear and detailed reference.

Characteristics of API 5CT L80 casing pipe

Classification and product level

API 5CT L80 casing pipe is divided into three product specification levels (PSL-1, PSL-2 and PSL-3) to meet different usage requirements. Its steel is further divided into three types according to performance requirements: L80-1, L80 9Cr and L80 13Cr. The materials and properties of each type are slightly different, but all are improved by heat treatment to improve corrosion resistance and mechanical properties.

Corrosion resistance

API 5CT L80 casing and tubing is designed to resist carbon dioxide (CO₂) and hydrogen sulfide (H₂S) corrosion, and is particularly suitable for oil and gas wells containing hydrogen sulfide. In harsh environments, its excellent corrosion resistance significantly extends service life and reduces the risk of pipeline cracking.

Heat treatment process

L80-1: Full-length quenching and tempering (Q).
L80 9Cr and L80 13Cr: Usually air quenching process is adopted. L80 13Cr may become brittle when tempered below 620°C (1150°F), so special attention should be paid to temperature control.

Mechanical properties

Yield strength: 552 MPa to 655 MPa.
Tensile strength: minimum 655 MPa.

The mechanical strength of L80 is higher than that of J55 and K55, similar to that of N80, and is a representative of medium strength grades.


Specifications and identification of API 5CT L80 casing and tubing

1. Size range

Casing pipe: OD 4-1/2” to 20”
Tubing: OD 1.050” to 4-1/2”


2. Wall thickness and tolerance

Wall thickness tolerance is -12.5%.
OD tolerance:
Less than 4-1/2”: ±0.79 mm (0.031 in).
Greater than or equal to 4-1/2”: OD +1%, ID -0.5%.


3. Length range

R1: 4.88 to 7.62 m.
R2: 7.62 to 10.36 m.
R3: 10.36 to 14.63 m.


4. Identification mark

L80-1: One red band, one brown band.
L80 9Cr: one red band, one brown band, two yellow bands.
L80 13Cr: one red band, one brown band, one yellow band.
API 5CT L80 casing and tubing manufacturing process

5. Manufacturing type

L80-1: Seamless or electric resistance welding (ERW) can be selected, but seamless process is more common.
L80 9Cr and L80 13Cr: Only seamless process is used.

6. Connection type

Different end connections are selected according to the purpose:
Casing pipe: BTC (trapezoidal thread) is commonly used.

Tubing: Usually EUE (external upsetting) or NU (non-upsetting).


API 5CT GRADE L80 Pipes, Casing and Tubing dimensions and tolerances chart

Specification API 5CT/ISO 11960
Material L80, steel grade
Outer Diameter 4 1/2″-20″, (114.3-508mm)
Wall Thickness 1.0mm – 30 mm
Casing Dimensions 114.3 mm (4.5″) to 406.4 mm (16″)
Tubing Dimensions 26.7 mm (1.05″) to 114.3 mm (4.5″)
Length max 12000mm
Thread type SC(Short round thread), LC(Long round thread), BC(Buttress thread)
API 5L API 5L GR.42 / 46 / 52 / 56 / 60 / 65 / 70 / 80

Heat treatment process

L80 casing pipe requires heat treatment to ensure material properties. L80 9Cr and L80 13Cr show excellent toughness and corrosion resistance after quenching and tempering.

API 5CT L80 casing and tubing main application

Oil and gas industry
API 5CT L80 casing is widely used in drilling and production operations. Its material is particularly suitable for oil and gas wells containing sulfur gas, and can effectively deal with the corrosion problem of hydrogen sulfide on pipelines.

Deep wells and complex well conditions
L80 casing pipe is an ideal choice for deep wells or oil wells with complex geological conditions that require high tensile strength and corrosion resistance.

Environmental protection and cost control

By selecting high-performance pipes of L80 grade, the service life can be significantly extended and the maintenance frequency can be reduced, thereby effectively reducing operating costs.


API 5CT L80 Carbon Steel Line Pipes Dimensions

Size Weight Outside Diameter Wall Thickness End Finish
Grade
in mm in mm J55K55 L80 N80 C90T95 P110
4 1/2 9.50 4.500 114.3 0.205 5.21 PS – – – –
10.50 0.224 5.69 PSB – – – –
11.60 0.250 6.35 PSLB PLB PLB PLB PLB
13.50 0.290 7.37 – PLB PLB PLB PLB
15.10 0.337 9.56 – – – – PLB
5 11.50 5.00 127.00 0.220 5.59 PS – – – –
13.00 0.253 6.43 PSLB – – – –
15.00 0.296 7.52 PSLB PLB PLB PLBE PLB
18.00 0.362 9.19 – PLB PLB PLBE PLB
21.40 0.437 11.10 – PLB PLB PLB PLB
23.20 0.478 12.14 – PLB
24.10 0.500 12.70 – PLB
5 1/2 14.00 5.500 139.7 0.244 6.20 PS – – – –
15.50 0.275 6.98 PSLB – – – –
17.00 0.304 7.72 PSLB PLB PLB PLBE PLB
20.00 0.361 9.17 – PLB PLB PLBE PLB
23.00 0.415 10.54 – PLB PLB PLBE PLB
6 5/8 20.00 6.625 168.28 0.288 7.32 PSLB – – – –
24.00 0.352 8.94 PSLB PLB PLB PLBE PLB
28.00 0.417 10.59 – PLB PLB PLBE PLB
32.00 0.475 12.06 – PLB PLB PLBE PLB
7 17.00 7.00 177.80 0.231 5.87 – – – – –
20.00 0.272 6.91 PS – – – –
23.00 0.317 8.05 PSLB PLB PLB PLBE –
26.00 0.362 9.19 PSLB PLB PLB PLBE PLB
29.00 0.408 10.36 – PLB PLB PLBE PLB
32.00 0.453 11.51 – PLB PLB PLBE PLB
35.00 0.498 12.65 – PLB PLB PLBE PLB
38.00 0.540 13.72 – PLB PLB PLBE PLB
7 5/8 24.00 7.625 193.68 0.300 7.62 – – – – –
26.40 0.328 8.33 PSLB PLB PLB PLBE PLB
29.70 0.375 9.52 – PLB PLB PLBE PLB
33.70 0.430 10.92 – PLB PLB PLBE PLB
39.00 0.500 12.70 – PLB PLB PLBE PLB
42.80 0.562 14.27 – PLB PLB PLB PLB
45.30 0.595 15.11 – PLB PLB PLB PLB
47.10 0.625 15.88 – PLB PLB PLB PLB
8 5/8 24.00 8.625 219.08 0.264 6.71 PS – – – –
28.00 0.304 7.72 – – – – –
32.00 0.352 8.94 PSLB – – – –
36.00 0.400 10.16 PSLB PLB PLB PLBE PLB
40.00 0.450 11.43 – PLB PLB PLBE PLB
44.00 0.500 12.70 – PLB PLB PLBE PLB
49.00 0.557 14.15 – PLB PLB PLBE PLB
9 5/8 32.30 9.625 244.48 0.312 7.92 – – – – –
36.00 0.352 8.94 PSLB – – – –
40.00 0.395 10.03 PSLB PLB PLB PLBE –
43.50 0.435 11.05 – PLB PLB PLBE PLB
47.00 0.472 11.99 – PLB PLB PLBE PLB
53.50 0.545 13.84 – PLB PLB PLBE PLB
58.40 0.595 15.11 – PLB PLB PLB PLB
10 3/4 32.75 10.75 273.05 0.279 7.09 – – – – –
40.50 0.350 8.89 PSB – – – –
15.50 0.400 10.16 PSB – – – –
51.00 0.450 11.43 PSB PSB PSB PSBE PSB
55.50 0.495 12.57 – PSB PSB PSBE PSB
60.70 0.545 13.84 – – – PSBE PSB
65.70 0.595 15.11 – – – PSB PSB
13 3/8 48.00 13.375 339.73 0.330 8.38 – – – – –
54.50 0.380 9.65 PSB – – – –
61.00 0.430 10.92 PSB – – – –
68.00 0.480 12.19 PSB PSB PSB PSB PSB
72.00 0.514 13.06 – PSB PSB PSB PSB
16 65.00 16 406.40 0.375 9.53 – – – – –
75.00 0.438 11.13 PSB – – – –
84.00 0.495 12.57 PSB – – – –
109.00 0.656 16.66 P P P – P
18 5/8 87.50 18.625 473.08 0.435 11.05 PSB – – – –
20 94.00 20 508.00 0.438 11.13 PSLB – – – –
106.50 0.500 12.70 PSLB – – – –
133.00 0.635 16.13 PSLB – – – –

Summary

API 5CT L80 casing and tubing occupies an important position in the oil and gas industry due to its excellent corrosion resistance, high strength and ability to adapt to complex well conditions. From material selection to heat treatment process, to specific specifications and markings, the design and production of L80 casing pipe all reflect the pursuit of efficiency and safety. Understanding its characteristics and application scenarios will help companies choose the most suitable products according to actual needs and provide strong support for the efficient operation of oil and gas extraction.
Recruiting Agents, contact: info@baowi-steel.com

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