API 5CT,API 5CT Pipe,API 5CT Tubing,API 5CT Standard

API 5CT

api 5ct,api 5ct j55,api 5ct l80,api 5ct n80,api 5ct p110,api 5ct k55

API 5CT

  • Steel Grade of API 5CT

    H40

    K55

    R95

    P110

    J55

    N80

    L80

    Q125

  • DIMENSIONS AND SIZES OF API 5CT CASING AND TUBING

    - Specification & Size of API 5CT Tubing

    DN O. D. Weight W. T. End Processing
    Non-upset coupling-thread Upset coupling-thread Steel Grade
    in mm lb./ft. lb./ft. in mm H40 J55 L80 N80 C90 T95 P110
    2 3/8 2.38 60.3 4 – 0.167 4.24 PU PN PN PN PN PN –
    4.6 4.7 0.19 4.83 PNU PNU PNU PNU PNU PNU PNU
    5.8 5.95 0.254 6.45 – – PNU PNU PNU PNU PNU
    6.6 – 0.295 7.49 – – P – P P –
    7.35 7.45 0.336 8.53 – – PU – PU PU –
    2 7/8 2.88 73 6.4 6.5 0.217 5.51 PNU PNU – – – – –
    7.8 7.9 0.276 7.01 – – – – – – –
    8.6 8.7 0.308 7.82 – – PLB PLB PLBE – PLB
    9.35 9.45 0.34 8.64 – – PLB PLB PLBE – PLB
    10.5 – 0.392 9.96 – – PLB PLB PLB – PLB
    11.5 – 0.44 11.18 – – – – PLB –  
    3 1/2 3.5 88.9 7.7 – 0.216 5.49 PN PN PN PN PN PN –
    9.2 9.3 0.254 6.45 PNU PNU PNU PNU PNU PNU PNU
    10.2 – 0.289 7.34 PN PN PN PN PN PN –
    12.7 12.95 0.375 9.52 – – PNU PNU PNU PNU PNU
    14.3 – 0.43 10.92 – – P – P P –
    15.5 – 0.476 12.09 – – P – P P –
    17 – 0.53 13.46 – – P – P P –
    4 4 102 9.5 – 0.226 5.74 PN PN PN PN PN PN –
    – 11 0.262 6.65 PU PU PU PU PU PU –
    13.2 – 0.33 8.38 – – P – P P –
    16.1 – 0.415 10.54 – – P – P P –
    18.9 – 0.5 12.7 – – P – P P –
    22.2 – 0.61 15.49 – – P – P P –
    4 1/2 4.5 114 12.6 12.75 0.271 6.88 PNU PNU PNU PNU PNU PNU –
    15.2 – 0.337 8.56 – – P – P P –
    17 – 0.38 9.65 – – P – P P –
    18.9 – 0.43 10.92 – – P – P P PLB
    21.5 – 0.5 12.7 – – P – P P PLB
    23.7 – 0.56 14.22 – – P – P P PLB
    26.1 – 0.63 16 – – P – P P PLB
    P——Plain；N—— Non-upset coupling-thread；U—— Upset coupling-thread； L——Integral


    - Specification & Size of API 5CT Casing

    DN O. D. Weight W. T.   End Machining Form
      Steel Grade
    in mm lb/ft kg/m in mm H40 J55 L80 N80 C90 P110
    K55 T95
    4 1/2 4.500 114.3 9.5 14.14 0.205 5.21 PS PS – – – –
    10.5 15.63 0.224 5.69 – PSB – – – –
    11.6 17.26 0.250 6.35 – PSLB PLB PLB PLB PLB
    13.5 20.09 0.290 7.37 – – PLB PLB PLB PLB
    15.1 22.47 0.337 9.56 – – – – – PLB
    5 5.000 127 11.5 17.11 0.220 5.59 – PS – – – –
    13 19.35 0.253 6.43 – PSLB – – – –
    15 22.32 0.296 7.52 – PSLB PLB PLB PLBE PLB
    18 26.79 0.362 9.19 – – PLB PLB PLBE PLB
    21.4 31.85 0.437 11.1 – – PLB PLB PLB PLB
    23.2 34.53 0.478 12.14 – – – – PLB –
    24.1 35.86 0.500 12.7 – – – – PLB –
    5 1/2 5.500 139.7 14 20.83 0.244 6.2 PS PS – – – –
    15.5 23.07 0.275 6.98 – PSLB – – – –
    17 25.3 0.304 7.72 – PSLB PLB PLB PLBE PLB
    20 29.76 0.361 9.17 – – PLB PLB PLBE PLB
    23 34.23 0.415 10.54 – – PLB PLB PLBE PLB
    26.8 39.88 0.500 12.7 – – – – – –
    29.7 44.2 0.562 14.27 – – – – – –
    32.6 48.51 0.625 15.88 – – – – – –
    35.3 52.53 0.687 17.45 – – – – – –
    38 56.55 0.750 19.05 – – – – – –
    40.5 60.27 0.812 20.62 – – – – – –
    43.1 64.14 0.875 22.22 – – – – – –
    6 5/8 6.625 168.28 20 29.76 0.288 7.32 PS PSLB – – – –
    24 35.72 0.352 8.94 – PSLB PLB PLB PLBE PLB
    28 41.67 0.417 10.59 – – PLB PLB PLBE PLB
    32 47.62 0.475 12.06 – – PLB PLB PLBE PLB
    7 7.000 177.8 17 25.3 0.231 5.87 PS – – – – –
    20 29.76 0.272 6.91 PS PS – – – –
    23 34.23 0.317 8.05 – PSLB PLB PLB PLBE –
    26 38.69 0.362 9.19 – PSLB PLB PLB PLBE PLB
    29 43.16 0.408 10.36 – – PLB PLB PLBE PLB
    32 47.62 0.453 11.51 – – PLB PLB PLBE PLB
    35 52.09 0.498 12.65 – – PLB PLB PLBE PLB
    38 56.55 0.540 13.72 – – PLB PLB PLBE PLB
    42.7 63.54 0.625 15.88 – – – – – –
    46.4 69.05 0.687 17.45 – – – – – –
    50.1 74.56 0.750 19.05 – – – – – –
    53.6 79.77 0.812 20.62 – – – – – –
    57.1 84.97 0.875 22.22 – – – – – –
    7 5/8 7.625 193.68 24 35.72 0.300 7.62 PS – – – – –
    26.4 39.29 0.328 8.33 – PSLB PLB PLB PLBE PLB
    29.7 44.2 0.375 9.52 – – PLB PLB PLBE PLB
    33.7 50.15 0.430 10.92 – – PLB PLB PLBE PLB
    39 58.05 0.500 12.7 – – PLB PLB PLBE PLB
    42.8 63.69 0.562 14.27 – – PLB PLB PLB PLB
    45.3 67.41 0.595 15.11 – – PLB PLB PLB PLB
    47.1 70.09 0.625 15.88 – – PLB PLB PLB PLB
    51.2 76.19 0.687 17.45 – – – – – –
    55.3 80.3 0.750 19.05 – – – – – –
    8 5/8 8.625 219.08 24 35.72 0.264 6.71 – PS – – – –
    28 41.62 0.304 7.72 PS – – – – –
    32 47.62 0.352 8.94 PS PSLB – – – –
    36 53.57 0.400 10.16 – PSLB PLB PLB PLBE PLB
    40 59.53 0.450 11.43 – – PLB PLB PLBE PLB
    44 65.48 0.500 12.7 – – PLB PLB PLBE PLB
    49 72.92 0.557 14.15 – – PLB PLB PLBE PLB
    9 5/8 9.625 244.48 32.3 48.07 0.312 7.92 PS – – – – –
    36 53.57 0.352 8.94 PS PSLB – – – –
    40 59.53 0.395 10.03 – PSLB PLB PLB PLBE –
    43.5 64.73 0.435 11.05 – – PLB PLB PLBE PLB
    47 69.94 0.472 11.99 – – PLB PLB PLBE PLB
    53.5 79.62 0.545 13.84 – – PLB PLB PLBE PLB
    58.4 86.91 0.595 15.11 – – PLB PLB PLB PLB
    59.4 88.4 0.609 15.47 – – – – – –
    64.9 96.58 0.672 17.07 – – – – – –
    70.3 104.62 0.734 18.64 – – – – – –
    75.6 112.5 0.797 20.24 – – – – – –
    10 3/4 10.750 273.05 32.75 48.74 0.279 7.09 PS – – – – –
    40.5 60.27 0.350 8.89 PS PSB – – – –
    15.5 67.71 0.400 10.16 – PSB – – – –
    51 75.9 0.450 11.43 – PSB PSB PSB PSBE PSB
    55.5 82.59 0.495 12.57 – – PSB PSB PSBE PSB
    60.7 90.33 0.545 13.84 – – – – PSBE PSB
    65.7 97.77 0.595 15.11 – – – – PSB PSB
    73.2 108.93 0.672 17.07 – – – – – –
    79.2 117.86 0.734 18.64 – – – – – –
    85.3 126.94 0.797 20.24 – – – – – –
    11 3/4 11.750   42 62.5 0.333 8.46 PS – – – – –
    47 69.94 0.375 20.24 – – – – – –
    54 80.36 0.435 8.46 – – – – – –
    60 89.29 0.489 9.53 – – – – – –
    65 96.73 0.534 11.05 – – – – – –
    71 105.66 0.582 14.42 – – – – – –
    13 3/8 13.375 339.73 48 71.43 0.330 8.38 PS – – – – –
    54.5 81.1 0.380 9.65 – PSB – – – –
    61 90.78 0.430 10.92 – PSB – – – –
    68 101.19 0.480 12.19 – PSB PSB PSB PSB PSB
    72 107.15 0.514 13.06 – – PSB PSB PSB PSB
    16 16.000 406.4 65 96.73 0.375 9.53 PS – – – – –
    75 111.61 0.438 11.13 – PSB – – – –
    84 125.01 0.495 12.57 – PSB – – – –
    109 162.21 0.656 16.66 – P P P – P
    18 5/8 18.625 473.08 87.5 130.21 0.435 11.05 PS PSB – – – –
    20 20.000 508 94 139.89 0.438 11.13 PSL PSLB – – – –
    106.5 158.49 0.500 12.7 – PSLB – – – –
    133 197.93 0.635 16.13 – PSLB – – – –
    P——Plain；S——Short-thread；L——Long-thread；B——Buttress thread；E——Extreme thread

  • CHEMICAL COMPOSITION (%) OF API 5CT

  • MECHANICAL PROPERTIES OF API 5CT

  • API 5CT DIMENSIONAL DEVIATION

    Items Allowable Deviation
    Out Diameter D ≤ 101.60mm ± 0.79mm
    D ≥ 114.30mm + 1.0%, -0.5%
    Wall Thickness -12.50%
    Mass (Single Lengths) +6.5%, -3.5%

  • LENGTH RANGE OF API 5CT

    Length
    Item Scope 1 Scope 2 Scope 3
    Tubing 6.10-7.32m 8.53-9.75m –
    Casing 4.88-7.62m 7.62-10.36m 10.36-14.63m

  • TEST AND INSPECTION OF API 5CT TUBING AND CASING

    - Hydrostatic Test

    Hydrostatic testing is a critical quality control measure during the production of steel pipe. The purpose of the hydrostatic test is to verify that the seam welds and pipe body can withstand the required internal water pressure without leaking. To conduct the test, water is pressurized and injected into the pipe. Once the water pressure reaches the specified level, the pipe is subjected to a thorough examination for leaks. Any leaks that are found are repaired and the hydrostatic test is repeated until the pipe passes inspection. This process ensures that the finished product can safely transport water or other fluids under high pressure without leaking.


    - Bend Test

    During the production of an API 5CT tubing and casing pipe, a bending test is conducted to ensure the quality of the weld. This test involves taking a sample of the steel pipe and subjecting it to a bending force. The results of the test are then evaluated to determine if there are any cracks in the weld. If no cracks are found, the pipe is deemed to be of acceptable quality. However, if cracks are found, the pipe is rejected and must be repaired or replaced. The bending test is an important part of the production process, as it helps to ensure that the final product is of high quality and will perform as intended.


    - Flattening Test

    Flattening tests are typically performed during the quality control testing of steel pipes, such as those produced according to the API 5CT specification. The flattening test is used to assess a sample pipe’s resistance to longitudinal deformation (i.e. crack growth) and its ability to maintain its shape under stress. The test is conducted by first welded a ring onto one end of the pipe sample. The other end of the sample is then placed in a jig, which compresses the entire length of the pipe along its longitudinal axis. Once the desired compression is achieved, the jig is released and the sample is removed for inspection. Any cracks or deformations that have occurred during the test are then documented and analyzed. The results of the flattening test can be used to assess the quality of the pipe and its suitability for use in various applications.


    - CVN Impact Test

    When it comes to tubing and casing pipe production, the impact test is an important quality control measure. Also known as the Charpy test, this test is used to assess a material’s ability to withstand impact. The test involves striking a specimen with a hammer and then measuring the amount of energy that is absorbed. The results are then compared to a standard to determine whether the material meets the required specification. There are three main areas that are tested during impact testing: the pipe body, the weld sea, and the heat-affected zone. By understanding the importance of this test, manufacturers can ensure that their steel pipes meet the required standards for strength and durability.

  • API 5CT PIPE ENDING PROCESSING

    - Flat End / Plain End

    A plain end, also known as a flat end or square cut, is a type of steel pipe that has a flat end rather than a beveled or threaded end. Plain end pipes are more common in larger diameter pipes and are typically used for carrying fluids under high pressure. One advantage of plain end pipe is that it is easier to weld or connect to other types of pipe. However, plain end pipe is less able to withstand external forces, such as those from wind or waves, and is more susceptible to damage from impacts. As a result, plain end pipe is often used in applications where it will be buried or otherwise protected from the elements.


    - Threaded End

    Casing is a steel pipe that is used to line the borehole of a drilling well. It is important to use casing in order to prevent collapse of the borehole and to protect the equipment that is being used. Casing is also used to keep out water, gas, and oil from entering the well. The threaded end on a casing pipe is used for making a connection with a screw. This type of connection is known as a threaded joint. In order to make this connection, a casing coupler is used. The coupler is screwed onto the end of the pipe and then the two pipes are connected together with a screw.


    - Rounded Nose

    A rounded nose on a casing pipe is simply a threaded connection that has been machined to have a rounded, rather than flat, end. This type of connection is often used when space is limited, such as in tight corners or other difficult-to-reach areas. In addition, rounded noses are less likely to snag on surrounding objects, making them ideal for use in high-traffic areas. Although they are more expensive than traditional threaded connections, the increased safety and durability of rounded noses make them well worth the investment.

  • WHAT IS API 5CT OCTG?

    Oil country tubular goods (OCTG) is a family of steel pipe products used in the drilling, completion, and production of oil and gas wells. And, API 5CT is the standard for the group of products. OCTG casing and tubing are essential elements in the well construction process, as they provide support and protection for the well bore. Casing is installed first, followed by tubing. The casing is typically made of steel or other strong materials that can withstand the high pressure and temperature of the reservoir. Tubing is also made of steel, but it is thinner walled and carried inside the casing. OCTG products are manufactured to meet specific specifications that are based on the type of well being drilled. For example, sour service casing must be able to resist corrosion from hydrogen sulfide gas. Deepwater casing must be able to withstand the high pressures found at great depths. Ultimately, OCTG products play a vital role in ensuring the safety and efficiency of oil and gas drilling operations.

  • WHAT IS THE DIFFERENCE BETWEEN API 5CT CASING AND TUBING?

    API 5CT casing is a tube that is placed in a wellbore in order to protect the wellbore from contamination. Casing is also used to stabilize the wellbore and keep it secure. Drilling and casing operations occur alternately, with the drill string being removed at predetermined intervals. API 5CT tubing is used to carry petroleum from the depths of the well to the surface. Oil and gas may sometimes self-elevate to the surface; however, pumps are typically required in order to bring these fluids to the surface. Tubing typically has a smaller diameter than casing. The main purpose of tubing is to transport petroleum from the well to an external location.

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