Abstract: A method of providing an inert atmosphere to the inside of a piping assembly prior to and during welding, including introducing a canister, and a deflated bladder which surrounds the canister, into a piping assembly to be welded. Introducing purge gas, thereby inflating the deflated bladder and sealing the canister against the inside of the piping assembly to be welded. Introducing excess purge gas from the bladder into a primary purge gas diffuser, thereby producing a first diffused purge gas stream. Introducing the first diffused purge gas stream into a secondary purge gas diffuser, thereby producing a secondary diffused purge gas stream. Introducing the secondary diffused purge gas stream into a tertiary purge gas diffuser, thereby producing a third purge gas stream. And introducing the third purge gas stream into the inside of the piping assembly to be welded.

Abstract: An apparatus for providing an inert atmosphere to the inside of a piping assembly prior to and during welding, including a cannister, and a bladder which surrounds the cannister and fits inside of a piping assembly to be welded. The cannister including a purge gas inlet connection fluidically connected to a bladder fill conduit, a bladder return conduit fluidically connected to a pressure relief device, the pressure relief device fluidically connected to a reduced pressure purge gas conduit, a primary purge gas diffuser, a secondary purge gas diffuser, a tertiary purge gas diffuser, and purge gas exit holes. Wherein the bladder fill conduit is configured to introduce purge gas into the bladder. Wherein the bladder is configured to expand and form a seal between the cannister and the piping assembly to be welded. And, wherein the bladder return conduit is configured to evacuate excess purge gas from the bladder.

Abstract: A flow of liquid cryogen from a liquid cryogen storage tank is vaporized at a heat exchanger against a flow of air in order to vaporize the liquid cryogen for a point of use and provide a flow of chilled air for use in refrigeration of a space, room or structure. The tank, heat exchanger, point of use, and space, room or structure are all located at a same installation.

Abstract: The present invention provides for a process for welding pipes together utilizing a cover device that has a gutter-shaped portion that is arranged on the plan of joint of the pipes to be welded together. By arranging the cover device such that the gutter-shaped portion faces and covers a portion of the plan of joint formed by the abutment of the ends of the pipes to be welded together, it is possible to eliminate or minimize the waste of gas that is utilized to create an internal gas backing.