What Is ISO 21809-3:2016?

ISO 21809-3:2016 is an international standard that specifies the requirements and provides recommendations for the external coating of buried or submerged pipelines used in the petroleum, petrochemical, and natural gas industries. This standard is part of a series of ISO 21809 standards that address different aspects of pipeline corrosion protection.

The Importance of External Coating

External coating plays a crucial role in protecting pipelines from corrosion and preventing leaks. It acts as a barrier between the pipeline and the surrounding environment, shielding it from the corrosive effects of soil, water, and other substances. The use of high-quality coatings not only extends the lifespan of pipelines but also ensures the safety and reliability of the entire infrastructure.

Key Requirements of ISO 21809-3:2016

ISO 21809-3:2016 establishes various requirements that must be met in order to achieve effective external pipeline coating. These requirements cover factors such as coating materials, application methods, surface preparation, and coating thickness. The standard provides detailed guidelines on the selection and testing of coating materials, ensuring their compatibility with the pipeline materials and operating conditions.

Recommended Practices for Coating Application

In addition to the requirements, ISO 21809-3:2016 also offers recommendations for best practices in applying external pipeline coatings. These include proper surface preparation techniques to remove contaminants and provide a suitable substrate for adhesion, as well as guidance on coating application methods, such as spraying, brush coating, or extrusion. Following these recommendations helps ensure the uniformity and integrity of the coating, minimizing the risk of coating failures and defects.

Overall, ISO 21809-3:2016 is a comprehensive standard that provides guidance to manufacturers, suppliers, and operators of buried or submerged pipelines in meeting the necessary requirements for effective external coating. By following the standard's guidelines and recommendations, industry professionals can ensure the long-term integrity and performance of pipelines, contributing to the safety and sustainability of the oil, gas, and petrochemical industries.