Patent ID: 7264013

Claim:
A system for transferring gas from a gas supply vessel to a delivery point of use which comprises: a vessel containing a gas source; a pigtail conduit having an initial end and a terminal end adapted for delivery of gas to a point of use; a surge chamber having a first end, a body section and a second end, said first end in communication with the initial end of said pigtail conduit, said body section of said surge chamber having a cross-section larger than the cross-section of said pigtail conduit and a second end in communication with said vessel containing said gas source; a purge gas source for delivery of a purge gas in the direction from the terminal end toward the vessel containing a gas source within said pigtail conduit during an alternating cycle of pressurization of said pigtail conduit with said purge gas; and, a depressurization source within said pigtail conduit allowing for removal of impurity gases retained within said pigtail conduit.