Apparatus and method for detecting leaks in welded heat exchange

Details Apparatus and method for detecting leaks in welded heat exchange Apparatus and method for detecting leaks in welded heat exchange

1987-08-25

1988-11-15

Levy, Stewart J.

Measuring and testing

With fluid pressure

Leakage

G01M 326

Patent

active

047839880

ABSTRACT:
An apparatus and a method for simultaneously testing the integrity of the welds in the plate pairs of a heat exchanger of the type made up of a stack of pairs of annular plates. The plates of each pair are substantially identical, having corresponding sets of first and second gas ports arranged alternately about each plate. The plates of each pair are joined together by continuous welds formed about each of their corresponding and aligned first and second gas ports. Those portions of the plates located between adjacent first and second gas ports are spaced from each other to permit passage of gas therebetween. The test apparatus comprises a fixed base member and top shiftable vertically toward and away from the base member between open and closed positions. The base member and the top member support, respectively, upper and lower annular seal assemblies. When a plate pair to be tested is located on the lower seal assembly, and the top member and upper seal assembly are closed thereon, the upper and lower seal assemblies form seals about their inner and outer peripheries and form a sealed chamber about each gas port of the plate pair and its surrounding weld. Each sealed chamber is connected to a leak detector. Air under pressure is introduced between the plates of the pair. Leakage of air through any of the welds into its respective sealed chamber is recorded.

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