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Api 1104 21st Edition Pdf Free 440golkes


API 1104 21st Edition: A Global Standard for Welding of Pipelines and Related Facilities




The American Petroleum Institute (API) is a trade association that represents the oil and natural gas industry in the United States and around the world. API develops and maintains standards and best practices for various aspects of the industry, including exploration, production, refining, transportation, and distribution. One of the most widely used and recognized standards is API Standard 1104, which covers the welding of pipelines and related facilities.


API Standard 1104 was first published in 1928 and has been revised and updated several times since then. The latest edition, the 21st edition, was published in September 2013 and contains 118 pages. The standard presents methods for the production of high-quality welds through the use of qualified welders using approved welding procedures, materials, and equipment. It also presents inspection methods to ensure the proper analysis of welding quality through the use of qualified technicians and approved methods and equipment. The standard applies to both new construction and in-service welding of carbon and low-alloy steel piping used in the compression, pumping, and transmission of crude petroleum, petroleum products, fuel gases, carbon dioxide, nitrogen, and where applicable, covers welding on distribution systems. The standard covers various welding processes, such as shielded metal arc welding, submerged arc welding, gas tungsten arc welding, gas metal arc welding, flux-cored arc welding, plasma arc welding, oxyacetylene welding, or flash butt-welding process or by a combination of these processes using a manual, semiautomatic, mechanized, or automatic welding technique or a combination of these techniques. The standard also covers the acceptance standards to be applied to production welds tested to destruction or inspected by radiographic, magnetic particle, liquid penetrant, ultrasonic, and visual testing methods.


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The 21st edition of API Standard 1104 incorporates several changes and improvements from the previous edition. Some of the major changes are:



  • The standard now includes requirements for welding on distribution systems.



  • The standard now includes requirements for flash butt-welding process.



  • The standard now includes requirements for ultrasonic testing of welds.



  • The standard now includes requirements for welder qualification using fracture-critical supplemental essential variables.



  • The standard now includes requirements for welder qualification using fracture-critical supplemental essential variables.



  • The standard now includes requirements for welder performance qualification using a mock-up test assembly.



  • The standard now includes requirements for procedure qualification using a mock-up test assembly.



  • The standard now includes requirements for procedure qualification using fracture-critical supplemental essential variables.



  • The standard now includes requirements for procedure qualification using fracture-critical supplemental essential variables.



  • The standard now includes requirements for procedure qualification records (PQRs) and welder performance qualification records (WPQRs).



  • The standard now includes requirements for procedure specification (WPS) format.



  • The standard now includes requirements for nondestructive examination (NDE) personnel qualification.



  • The standard now includes requirements for NDE equipment calibration.



  • The standard now includes requirements for NDE acceptance criteria.




The 21st edition of API Standard 1104 is available for purchase from the API website for $345.00. The standard is also available in PDF format for free download from various sources on the internet. However, users should be aware that downloading or sharing unauthorized copies of the standard may violate intellectual property rights and may not reflect the latest updates or corrections. Users should always refer to the official version of the standard from API to ensure compliance and accuracy.


API Standard 1104 is an important global standard that supports industry-wide actions to strengthen environmental sustainability efforts while meeting growing energy demand. The standard provides guidance and requirements for ensuring the quality and safety of welded pipelines and related facilities that transport vital energy resources across the world. The standard is widely adopted and referenced by various authorities having jurisdiction (AHJs), such as regulators, operators, contractors, inspectors, auditors, certifiers, and others involved in the pipeline industry. The standard is also recognized by other international organizations and standards bodies, such as the International Organization for Standardization (ISO), the European Committee for Standardization (CEN), the Canadian Standards Association (CSA), and others. The standard is continuously reviewed and revised by a committee of experts and stakeholders from the industry, academia, government, and public interest groups to reflect the latest developments and best practices in the field of welding.


API Standard 1104 is one of the many standards and best practices that API develops and maintains to support the oil and natural gas industry in delivering safe, reliable, and affordable energy to the world. API also provides various services and programs, such as certification, training, accreditation, advocacy, research, statistics, publications, events, and more. For more information about API and its standards and services, please visit the API website.




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