Airgas, Inc.

Air Liquide Industrial U.S. LP

L'air Liquide,societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude

Scott Laymon

Frederick A Schweighardt

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.

Method for pipe purging

This disclosure describes a method and apparatus for controlling the temperature of a welding zone for welding together pipe sections. The temperature is controlled by a flow of inert gas through the pipes. The inert gas flow is cooled and acts as a heat sink to remove heat from the weld zone thereby controlling the weld zone temperature.

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Kingston, GA, United States of America

Scott Laymon