Experimental Studies on the Air Test Method for Leak Detection

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The method of air-test for leak detection was studied in an idealized model using glass capillarys submerged in ethyl-alcohol, water, and water solution of soap respectively. With various inlet-pressure (P1), we measured the total volume (Q) and the number (N) of rising bubbles to the surface of the liquid from the tip of a capillary in unit time. The relation between Q and P1 was found to be expressed empirically like a viscous flow, Q=α (P12-12), where α gives an intrinsic constant for each leak and α for the air was proved to be equal to the value for the leakage from atmosphere to vacuum assuming the leakage was pure viscous flow. In order that Q is independent on the kind of liquid, the range of α sets limit to the lowest value of P1. At the pressure P1 over 3.5 kg cm-2, α indicated a sensitivity of detectable leakage in this method was experienced to be about 4×10-7 mmHg ·l·sec-1 which was one hundredth of estimated value in other reference. The value of N in soap solution was found to be (2-3) times it in water, and that in alcohol to be (3-8) times it in water at the pressure was higher than a certain limited one. However, in order to obtaine stablely this highest sensitivity by this method, we had to take care of the following points. 1), Before the system was submerged into the liquid, the compressed air was charged in the system up to the testing pressure which has been determined to be the highest value of allowed charging pressure. 2), The gas used to the test was also dissolved in the liquid up to saturation fully. In an industrial field, the air test would be used to perform smoothly leak detection with a crystal water solution of the soap.
一般社団法人日本真空学会の論文

Experimental Studies on the Air Test Method for Leak Detection

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概要

一般社団法人日本真空学会 | 論文

スポンサーリンク

Experimental Studies on the Air Test Method for Leak Detection

スポンサーリンク

概要

一般社団法人 日本真空学会 | 論文

スポンサーリンク

一般社団法人日本真空学会 | 論文