Jet Impingement Tests

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Abstract
This paper describes the operation of jet impingement test apparatus in the laboratories of The British Non‐Ferrous Metals Research Association in London and at International Nickel Company's Marine Corrosion Test Station at Harbor Island, N. C. Certain differences in results obtained on the same materials in the two laboratories are discussed with relation to differences in testing conditions. Particular attention is given a comparison between results secured with water that is recirculated and used over and over again, as is the practice in the B.N.F.M.R.A. laboratories, with results obtained with water that is passed through the apparatus only once, as has been the regular practice at Harbor Island. Effects of air bubbles, jet velocity, and other incidental factors are also discussed. The relationship between test results and service experience is considered. It is concluded that test conditions established for use in the B.N.F.M.R.A. laboratory, using recirculated water, are too drastic when applied at Harbor Island, using water that is not recirculated, to permit proper comparisons of materials. The testing conditions at Harbor Island can be modified to yield results in harmony with the B.N.F.M.R.A. results either by reducing the jet velocity or by recirculating the water.

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