Part UIG - Requirements for Pressure Vessels Constructed of Impregnated Graphite General: UIG-1 through to UIG-3 Materials: UIG-5 through to UIG-8 Design: UIG-22 through to UIG-60 Fabrication: UIG-75 through to UIG-84 Inspection and Tests: UIG-90 through to UIG-112 Marking and Reports: UIG-115 through to UIG-121 3:* Pressure Relief Devices: UIG-125 MANDATORY APPENDICES: 1 through to 48 NONMANDATORY APPENDICES: A through to PP Division 2 - Alternative Rules This division covers the mandatory requirements, specific prohibitions and nonmandatory guidance for materials, design, fabrication, inspection and testing, markings and reports, overpressure protection and certification of pressure vessels having an internal or external pressure which exceeds 3000 psi (20700 kPa) but less than 10,000 psi. The pressure vessels can be either fired or unfired. The pressure may be from external sources, or by the application of heating from an indirect or direct source as a result of a process, or any combination of the two. The rules contained in this section can be used as an alternative to the minimum requirements specified in Division 1. Generally the Division 2 rules are more onerous than in Division 1 with respect to materials, design and nondestructive examinations but higher design stress intensity values are allowed. Division 2 has also provisions for the use of finite element analysis to determine expected stress in pressure equipment, in addition to the traditional approach of design by formula (Part 5: "Design by Analysis requirements"). Division 3 - Alternative Rules for Construction of High Pressure Vessels This division covers the mandatory requirements, specific prohibitions and nonmandatory guidance for materials, design, fabrication, inspection and testing, markings and reports, overpressure protection and certification of pressure vessels having an internal or external pressure which exceeds 10,000 psi (70,000 kPa). The pressure vessel can be either fired or unfired. The pressure may be from external sources, by the application of heating from an indirect or direct source, process reaction or any combination thereof. See also Pressure Equipment Directive List of welding codes EN 13445 PD 5500 Uniform Mechanical Code Uniform Plumbing Code References ASME standards Pressure vessels Structural engineering standards