Bulk cryogenic liquid systems should be installed in accordance with which standard?

• A. NFPA 45
• B. NFPA 55
• C. CGA 50
• D. CGA 55

Answer: (B)

Bulk cryogenic liquid systems require a standard that specifically addresses the storage, handling, and use of cryogenic fluids, with requirements for temperature-controlled storage, transfer piping, venting, insulation, and safety systems to manage hazards like extreme cold, oxygen displacement, and gas expansion. NFPA 55 is the standard that covers these aspects for cryogenic fluids, including bulk storage systems and their proper design, installation, and operation. While NFPA 45 focuses on fire protection in laboratories and CGA standards provide related safety guidelines, they do not supersede the comprehensive bulk-cryogenic requirements found in NFPA 55.