Primary Containment 1 : The first level of containment, consisting of the inside portion of that container that comes into immediate contact on its inner surface with the material being contained
NFPA 1 Fire Code, National Fire Protection Association (NFPA), MA, USA 2009 ed. https://law.resource.org/pub/us/code/ibr/nfpa.1.20 03.pdf, (Code: Nat Fire Protection Association Fr&LfSf Requir - Amer) {171 NFC}