NFPA 55 provides rules for siting bulk cryogenic supply systems, including some general rules for locating cryogenic storage tanks in walled areas. P-41 provides more details about locating tanks in those areas to provide compliance to NFPA 55.
Plastics rainwater piping systems for above ground external use - Unplasticized poly(vinyl chloride) (PVC-U) - Part 2: Guidance for the assessment of conformity