API-510 guides the decommissioning process for pressure vessels by outlining a series of steps designed to ensure safety and compliance with environmental regulations. The process begins with a thorough cleaning to remove any hazardous substances, followed by a comprehensive inspection to document the vessel's condition. The vessel is then isolated and, if necessary, cut into manageable sections for removal, using methods that prevent any contamination or environmental impact. Finally, all associated documentation is updated to reflect the decommissioning, and materials are recycled or disposed of in accordance with local environmental standards.