The Project Standard and Specification described here provide a comprehensive framework for the design, fabrication, and inspection of unfired pressure vessels, including waste heat boilers. These vessels are critical components in various industrial processes, and their proper functioning is essential for safety, efficiency, and environmental compliance. In addition to detailing design and fabrication requirements, the standard also includes stringent inspection protocols to ensure that the vessels meet all relevant safety and quality standards. This includes testing for material integrity, weld quality, and overall structural soundness. The standard also addresses small commercial vessels, such as sandblast machines, paint sprayers, and gunite machines, which are not part of the process equipment. These vessels are subject to the manufacturer’s standards, ensuring that they are designed, fabricated, and maintained according to the manufacturer’s specifications. By adhering to these standards and specifications, industries can minimize the risk of accidents, improve operational efficiency, and extend the service life of their equipment. Additionally, compliance with these standards helps in meeting regulatory requirements and ensures the safety of workers and the surrounding environment.