The API 5CT standard is an important standard used in the oil and gas industry to regulate octg pipe.
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Here are some key points and requirements of the API 5CT standard:
The API 5CT standard has clear provisions for the allowable deviation of the outer diameter of the pipe. For example, for pipes with an outer diameter less than 114.3mm, the outer diameter deviation is ±0.79mm; while for pipes with an outer diameter greater than or equal to 114.3mm, the outer diameter deviation is -0.5%D to +1.0%D.
The allowable deviation of wall thickness is -12.5%.
The weight deviation of a single pipe is -3.5% to +6.5%, while the weight deviation is -3.5% for orders with a vehicle load less than 18.144 tons; the weight deviation is -1.75% for orders with a vehicle load greater than or equal to 18.144 tons.
The length deviation of casing and liner is clearly specified. For example, the first-level length is 4.88 to 7.62 meters, and the minimum allowable length is 1.83 meters.
The straightness requirement of the pipe is that the deviation from the straight line or the chord height should not exceed the specified value. For example, for pipes with an outer diameter greater than or equal to 114.3mm, the total curvature should be less than or equal to 0.2%L.
The API 5CT standard also has clear provisions for the requirements of through rods. For example, for casing pipe and liner with an outer diameter less than 244.5mm, the minimum diameter of the standard through rod is 152mm, and the calculated inner diameter d-3.18mm.
The API 5CT standard has detailed provisions for the different chemical compositions of steel grades. For example, the H40 steel grade does not specify the carbon content, while the J55 and K55 steel grades do not specify the carbon content.
The API 5CT standard has clear provisions for the yield strength and tensile strength of different steel grades. For example, the yield strength of the J55 steel grade is 379 to 552 MPa, and the tensile strength is greater than or equal to 517 MPa.
API 5CT standard also stipulates the hardness of different steel grades. For example, the maximum hardness of C90 steel grade is HRC 25.4, and the maximum hardness of Q125 steel grade is also HRC 25.4.
API 5CT standard also clearly stipulates the requirements for impact test. For example, the Charpy V-notch (CVN) absorption energy requirement for J55 and K55 steel grades is that the full-size transverse Cv is greater than or equal to 20J, and the full-size longitudinal Cv is greater than or equal to 27J.
API 5CT standard requires that all inner and outer edges of all pipe ends should not have burrs, and all pipes should not have defects such as quenching cracks, surface cracking defects, etc.
API 5CT standard requires that steel pipes should be subjected to hydrostatic test one by one, and at least reach the specified hydrostatic test pressure without leakage, and the pressure stabilization time should be no less than 5 seconds.
API 5CT standard octg pipe plays an important role in preventing oil wells from being damaged by shallow oil layers and supporting oil and gas transportation. In addition, the casing pipe can support the weight of the wellhead layer to prevent collapse. API 5CT casing pipe ensures the smooth progress of the entire drilling process, and then transports oil and gas from the well to the ground.
API 5CT octg pipe is the lifeblood of the oil well, so it should have higher quality requirements. Because under special circumstances, poor quality pipes are easily damaged. It is easy to cause accidents and even cause the oil well to be directly scrapped. Therefore, there are many requirements for the selection of API 5CT octg pipe, such as selecting and purchasing according to the bottom hole pressure. When you buy casing pipe, we recommend that you choose a regular enterprise that provides casing and tubing that can always maintain good performance even under harsh conditions.
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We are pleased to announce the publications of the 10th edition of Specification 5CT, Casing and Tubing, and the 7th edition of Technical Report 5C3, Calculating Performance Properties of Pipe Used as Casing or Tubing. These new editions provide technical updates that have reached consensus within API’s Subcommittee on Tubular Goods and will now give industry consistent practices in the respective areas of the standards. As part of API’s standards develop program, these updates are reflective of API’s standards program mission to provide a forum for development of consensus-based industry standards, and technical cooperation to improve the industry’s safety performance and competitiveness.
The key changes to highlight for Spec 5CT are:
Effective Date and Program Implications
The Monogram Program effective date will be July 1, .
Current licensees shall ensure that products manufactured on and after July 1st, meet the requirements of API 5CT 10th edition in order to be monogrammed.
Also, effective July 1st, , API 5CT audits will be conducted to the 10th edition of the document.
To Purchase
Specification 5CT and Technical Report 5C3 are available on API’s new Compass Platform. A Compass subscription gives you organization-wide, 24/7 access to all of the API standards and specifications you need to ensure, safety, compliance and interoperability. With a subscription on Compass, you are ensured consistent and up-to-date access to the latest API standards. For additional information please visit API's Standard Subscription Service.
Purchase the standard at the API webstore.
Additional Information and Questions
A companion video, highlighting key changes and the implications for Monogram licensees, will be available for viewing in August. Registration details will be available mid-May. To receive direct notification of when registration is open, please with the subject “5CT”.
API receives numerous inquiries related to its standards, specifications, recommended practices, technical reports and codes (i.e. documents). While we can provide answers to many of these questions, there are certain categories of queries to which API cannot provide assistance. We use the terms “General and Technical Questions,” and “Requests for Interpretation” to describe the typical categories of questions we receive. The information below will help you understand what type of questions we can answer and how to go about submitting your question to us for consideration.
Please carefully read the guidelines for submission on the web page’s tabs prior to submitting your request for interpretation. If you are ready to submit your interpretation request, please visit the RFI website.
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