This Standard defines the requirements that are applicable to all pressure vessels for human occupancy (PVHOs) fabricated to this Standard (Sections 1 through 4) and shall be used in conjunction with specific requirements in Sections 5 through 7, as applicable, and Mandatory Appendices of this Standard. In the event of conflict between Sections 1 through 4 and Sections 5 through 7, the application-specific requirements from Sections 5 through 7 shall govern.