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API-510 Test to Keep Your Tank up to CodeAn industrial plant with tall metal structures, pipelines, and towers under a clear blue sky. The text "API-510" and "CODE STEEL INDUSTRIAL INSPECTIONS" is displayed on the left side of the image.

The API-510 is a guide for internal and external inspections of pressure vessels. The code also is a guide for on-stream and thickness measurement inspections. This API test was first published in 1958 and has grown and evolved since then to account for technological innovations, inspection practices changes, and new methodologies.

Typically, API-510 applies to refining and chemical processing vessels, but can also be applied to other industries where pressure vessels are used. The code covers both those vessels that have been constructed in accordance with construction codes and those that have not been. The code does not apply, however, to vessels that have been decommissioned.

API (American Petroleum Institute) offers a certificate for the 510 test to identify individuals with a broad knowledge of tank maintenance, inspection, repair and the alteration of pressure vessels. To receive the API-510 certificate, individuals take a two-part examination that they must pass. These tests require applicants to demonstrate their knowledge of API-510 and other related documents. To maintain certification, pressure vessel inspectors must apply every 3-years for recertification.