Industrial applications of Helium Leak Test Leaks are unique sorts of imperfections that can have a significa nt significance in frameworks where they affect security and execution. Many items will have diminished dependability on the off chance that they contain leaks. Leak testing is a non - damaging assessment method that is utilized for the location and localization of leaks and for the estimation of leak age in frameworks or items which is under vacuum or tension. Before a break test assessment is performed it is important to decide whether the assessment is to find out regardless of whether leaks are availa ble, generally , leak discovery, or on the other hand if the assessment is to decide the area of a hole, confining break recognition. At times an assessment for by and large hole discovery is performed first, and assuming leaks are distinguis hed, the restricting method is applied for pinpointing of the break. This is anyway not generally needed nor conceivable. Also , it is important to decide the break rate which can be endured, as no articles are 100 percent tight. That is the necessity of the s nugness of the i tem. On the off chance that for instance , the item must be watertight, a hole rate under OK mbar l/s will be adequate. Yet, if the item for instance is to be utilized in the compound business the prerequisites can be a break r ate under 10 - 6 mbar l/s. In leak testing , a tension distinction between the external and the inward side of the item to be analyzed is delivered. In this way how much gas or fluid is going through a break is estimated. In the helium leak testing helium is utilized as a hunt gas, from this the selection of the method. On a basic level two , methods are applied for leak testing and localization of leaks, the "Vacuum method" and the "Overpressure method". At the "Vacuum method , " the item to be inspected for leak s is emptied and splashed from an external perspective with a pursuit gas, for this situation Helium. The gas enters through any leaks present in the item and is distinguished by a sensor associated with the hole test instrument. At the "Overpressure metho d , " the item to be inspected for leaks is loaded up with a hunt gas, Helium, under slight overpressure. The hunt gas gets away from any leaks present on the outside and is distinguished by a finder probe. This finder probe is as a rule called a "sni ffer" going about as a gas - inspecting probe. For the two methods , uniquely created l eak indicators are accessible. The item under test ought to, assuming conceivable, be tested by its last method of purpose, for example assuming it is utilized under vacuum , the vacuum method ought to be applied, and on the off chance that it is at last compressed, the overpressure method ought to be embraced. Instances of testing with the two methods are shown underneath. The Vacuum method is outlined with the Hood Test and the Tracer Probe Test and the Overpressure method with the Hood test, the Bombing test , and the Finder Probe or Sniffer test. Vacuum method - Hood test The Hood Test is a general hole test. The emptied test object is covered with a (plastic) hood. The space be tween the test object and the hood is loaded up with Helium from the pursuit gas supply so the all - out external surface of the test object is presented to the Helium search gas. The helium enters through all leaks present at the emptied test article and he nce the identifier associated with it. The identifier presently demonstrates the all - out leak rate. The hood test can for instance be utilized for the assessment of little vessels. Vacuum method - Tracer probe test At the tracer probe test , a similar set - up as utilized for the hood test is applied, however without the hood. A splash firearm is utilized to shower a fine stream of helium search gas at regions associated with leak ing. Again the helium enters through leaks present at the emptied test object and th e indicator associated with it. The locator shows on the off chance that a hole is available at the area the helium search gas is presented to. The tracer probe test can for instance be utilized on seals, spine associations, weld creases , and so on Overpr essure method - Hood test As in the vacuum hood test the overpressure hood test is a general break test. A test set - up like the vacuum test is utilized. A vacuum chamber is utilized for the hood, which can be cleared by a helper siphon and with which the hol e finder is associated. The helium search gas which is getting away from leaks in the test object is shown by the break identifier. The utilization of a helium leak locator permits the identification of tiny leaks and is reasonable for programmed leak recognition in modern hardware. The hood test can for instance be utilized for the assessment of vessels, heat exchangers , and so on Overpressure method - Bombing test The bombing test is a strain/vacuum method of hole discovery utilized for testing airt ight fixed parts containing a depression that can be gas - filled or emptied. The items to be tested, get in a strain chamber and presented to the helium search gas. During an openness season of as long as a few hours at a high helium pressure, the helium will enter through any leaks present in the test object. This is the part alluded to as the "bombing". After the compression or bombing , the items are tested for helium outflow in a vacuum vessel, following a similar methodology as in the hood test. This test li censes the discovery of the littlest break rates and is particularly utilized for objects which can not be gas - filled by different means. The bombing test can for instance be utilized for the assessment of semiconductors, ampoules , and so on Overpressure method - Sniffer test In this sort of test , the associated regions with the test object are painstakingly investigated through a finder probe, a "sniffer", which is associated with the hole locator. The item to be tested is under helium search gas overpressure. The awareness of the method and the exactness of restricting any cracked focuses rely upon the idea of the hunt gas, the plan of the sniffer , and the time consisted of the genuine hole testing gadget. The sniffer test can f or instance be utilized for the assessment of vessels, heat exchangers, seals, rib associations, weld creases , and so on