In pressure vessel engineering, safety and compliance are established long before fabrication begins. One of the most critical early-stage documents is the User’s Design Specification (UDS) . A thorough UDS review and certification process ensures that pressure vessels are designed, analyzed, manufactured, and inspected in full alignment with applicable codes such as ASME Boiler and Pressure Vessel Code (BPVC) Section VIII. User’s Design Specification (UDS) The UDS is a form