US 8,196,801 B1 · Method of brazing of a special gas delivery system using fittings having purge orifices

Abstract

Copper purge fittings for brazing components of a special gas delivery line together are provided. An orifice is located on the top or end portion of each fitting to create a continuous flow of inert purging gas through the delivery line under construction while brazing. Each fitting will reach temperatures exceeding 1500 degrees. By having a continuous flow of inert gas while brazing, the protection of the interior portion of the system remains intact. Without a purge in place, the intense heat would create a rapid immediate buildup of carbon and other contaminates. Brazing is only commenced after the elimination of harmful oxygen and proper flow of purging gas is measured. The purging gas pressure is lowered if it becomes high enough to potentially cause separation of tubular sections from the purge fittings and is raised if a low flow rate is detected indicating potential insufficient flow of purging gas.

Claims6

Dependent claims

A method of brazing a gas line comprising the steps of:

(a) forming a line under construction by positioning tubular sections and fittings together;
(b) coupling a purge fitting at an end of the line under construction having an orifice therein for passing inert purging gas that is within the line, out of the line through the purge fitting orifice at the end of the line;
(c) passing inert purging gas through the line;
(d) while the inert purging gas is being passed through the line, measuring the oxygen content of the inert purging gas passing out of the line through the orifice in the purge fitting at the end of the line;
(e) commencing brazing of the tubular sections and the fittings when measurement of the oxygen content of the inert purging gas indicates the absence of oxygen;
and
(f) continuing brazing of the line only while purging gas that is oxygen free continues to be passed through the line.

4 more elements

Dependencies are inferred from the claim text.

Method of brazing of a special gas delivery system using fittings having purge orifices

Life of this patent

Method of brazing of a special gas delivery system using fittings having purge orifices

Life of this patent

Abstract

Claims6