Patent ID: 7128212
Filing Date: 2006-10-31
Classification: F16L

Abstract:
1. A system for holding critical fluids, the system comprising: a vessel that is made with polyethylene, has at least about 30 gallons of capacity, and a fluid contained therein, the fluid being a member of the group consisting of sulfuric acid, hydrochloric acid, hydrofluoric acid, tetramethyl ammonium hydroxide, ammonium hydroxide, hydrogen peroxide, phosphoric acid, n-methyl pyridine, isopropyl alcohol, mixtures thereof, and mixtures thereof with other fluids; a port on the vessel; an insert mechanically engageable with the port; and a resilient non-fluoropolymer sealing element comprising a copolymer of ethylene and octene that is corrosion-resistant, essentially impermeable to the contents of the vessel, comprises a material having a Shore A hardness between about 75 and about 95, has less than 1000 ppm total trace metals as measured by digestion in nitric acid and has an exterior that seals against a first sealing surface on the port and against a second sealing surface on the insert; wherein the port, the insert, and the sealing element cooperate to form a seal between the sealing element and the first and second sealing surfaces that is adapted to hold at least 3 psi of air for at least 5 minutes.