System for detecting leaks and associated method

A leak detection method for a part having a permeable zone, wherein the method uses a system comprising:

• a test chamber configured to receive the part to be tested;
• a device suitable for varying a pressure in the test chamber and/or in the part to be tested;
• a measuring device for measuring a physical quantity representative of a leak level;
• a main pipe configured to cooperate with the permeable zone of said part, said main pipe having one end which communicates with the permeable zone, while an other end of said main pipe opens outside the test chamber;
• a first seal and a second seal ensuring tightness between the outside and the inside of the part to be tested and defining an inter-seal volume between the first seal and the second seal, the first seal isolating the inside of the part to be tested from the inter-seal volume, and the second seal isolating the inter-seal volume from the outside of the part to be tested;
• a secondary pipe opening in said inter-seal volume, and
• an insert configured to cooperate with the permeable zone of said part having the permeable zone, said insert comprising a main body wherein said main pipe and said secondary pipe are arranged in said insert, and said first seal and said second seal are mounted on said insert, wherein said measuring device uses a first pressure established in said test chamber via said main pipe and a second pressure established in said inter-seal volume via said secondary pipe, for detecting the leak in the part to be tested;
• wherein the method comprises:
• establishing at least the first pressure in the test chamber and the inter-seal volume respectively via the main pipe of the insert and via the secondary pipe of the insert;
• determining a first leak level;
• establishing, in the inter-seal volume, the second pressure via the secondary pipe of the insert;
• determining a second leak level;
• and
• determining the leak level of the part based on the first and second leak levels.