Abstract: An improved chemical pressure vessel for storage, shipping and pressurized dispensing of fluid chemicals is formed with a seamless fluoropolymer inner liner permanently encapsulated within a metallic overpack. To protect the liner from the heat of welding during encapsulation of the overpack around the liner, the liner is formed with recessed indentation immediately adjacent the weld area. The indentation retains a sacrificial layer of fluoropolymer to ensure that the heat of welding will not affect the liner itself. In addition, the overpack is formed with a protective flange or "puddle plate" in the area of the weld to ensure that there is adequate isolation of the weld puddle from the fluoropolymer liner. The fact that the liner is seamless and permanently encapsulated within the overpack eliminates the need for periodic disassembly of the vessel for inspection of seams for possible leakage.

Abstract: A pressurizable chemical vessel for storing and transporting fluid chemicals and delivering the contents under pressure to the point of the use is comprised of an outer housing, an inner fluid container, and an energy absorbing filler therebetween. The outer housing consists of an upper canister and a canister base removably attached thereto. The entire assembly is desirably of nonmetallic construction and the vessels are designed to be securely stackable for storage and transport. The neck of the chemical vessel is adapted to receive a detachable pressurizable fluid delivery assembly of known design.