A modification to an LPG storage tank requires compliance with which code?

• A. API 650
• B. ASME Section VIII
• C. OSHA 1910
• D. NFPA 58

Answer: (B)

LPG is stored under pressure, so a tank that holds LPG is treated as a pressure vessel. When you modify the vessel, the changes affect the pressure boundary, and the design, materials, fabrication, inspection, and testing must meet the code governing pressure vessels. That code is ASME Section VIII. API 650 covers atmospheric aboveground storage tanks and wouldn’t apply if the LPG tank is designed to withstand pressure changes. OSHA 1910 is about general safety requirements, not vessel design standards. NFPA 58 provides safety rules for propane storage and handling, but it does not replace the formal pressure-vessel design code for modifications. Therefore, the appropriate code for a modification to an LPG storage tank is ASME Section VIII.