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03512 FAILURE OF BRASS GAS CYLINDER VALVES BY COMMERCIAL LEAK DETECTOR FLUIDS

Picture for 03512 FAILURE OF BRASS GAS CYLINDER VALVES BY
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Product Number: 51300-03512-SG
ISBN: 03512 2003 CP
Author: A.S. Fabiszewski, J.J. Hoffman
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Many commercial leak detection fluids contain trace amounts of ammonia, ammonium salt, or amines for pH control. The leak detection fluids are routinely applied to threaded outlet connections of compressed gas cylinder valves. Cracking was recently discovered in a number of compressed gas cylinder valve outlet connections fabricated from forging brass. Failure analysis indicated the cracking initiated from the external surface of the outlet connection and propagated intergranularly. The crack morphology was indicative of stress corrosion cracking. Exposure to commercial leak detection fluids was the only common link among the cracked brass valves. Thus, a laboratory test program was initiated exposing brass alloy U-bends to commercial leak detection fluids. The test results showed that crack initiation occurred when the leak detection fluids were allowed to concentrate on the stressed ubend specimens. This testing has become the catalyst to develop an ASTM standard for screening commercial leak detection fluids. Keywords: leak detector fluids, leak detector solutions, leak detector soap solutions, bubble solutions, forging brass, UNS C37700, cartridge brass, UNS C26000, cylinder valves, stress corrosion cracking
Many commercial leak detection fluids contain trace amounts of ammonia, ammonium salt, or amines for pH control. The leak detection fluids are routinely applied to threaded outlet connections of compressed gas cylinder valves. Cracking was recently discovered in a number of compressed gas cylinder valve outlet connections fabricated from forging brass. Failure analysis indicated the cracking initiated from the external surface of the outlet connection and propagated intergranularly. The crack morphology was indicative of stress corrosion cracking. Exposure to commercial leak detection fluids was the only common link among the cracked brass valves. Thus, a laboratory test program was initiated exposing brass alloy U-bends to commercial leak detection fluids. The test results showed that crack initiation occurred when the leak detection fluids were allowed to concentrate on the stressed ubend specimens. This testing has become the catalyst to develop an ASTM standard for screening commercial leak detection fluids. Keywords: leak detector fluids, leak detector solutions, leak detector soap solutions, bubble solutions, forging brass, UNS C37700, cartridge brass, UNS C26000, cylinder valves, stress corrosion cracking
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