Tranter heat exchanger manual
The external helium leak test also is performed as an accumulated leak test to verify the gasket-sealing capability to the outside. This leak test will ensure that there is no contamination between the two fluids running on each side of the plate. The internal leak test is performed via accumulation passing the ring gasket and gasket diagonal. Once completed, the semi-welded plate heat exchanger is dehydrated under vacuum and then ready for the second and third helium leak tests. A hydraulic strength test then is performed according to specified design codes (PED or ASME).
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Helium leak testing under factory conditions allows a manufacturer to document the correct gasket sealing and the tightness of cassette.Īfter completing the helium leak test of the single cassettes, the cassettes are passed to the assembly site, where gaskets are mounted and, eventually, the plate pack is built into a frame. It is only natural that the helium leak-chamber test can deliver more accurate results. As a result, mistakes can, and often do, occur. Operators are responsible for checking hundreds of cassettes of varying sizes. These cracks are invisible - even for the best eyes.Īnother issue that stems from visual checks is the human factor. (Manual checks occur when the operator of the machine, after manufacturing the plate, examines the cassettes to find imperfections in the body and design.) Visual checks are at high risk of missing cracks inside the plate’s material, which may result in contamination or leakage problems after some period of operation due to fatigue.
TRANTER HEAT EXCHANGER MANUAL MANUAL
The helium leak chamber can help detect potential material cracks in the plate that might be missed during manual and visual checks. The test can be used to determine whether all of the semi-welded plates are tight enough to be passed on to the assembly line or delivered to users needing replacement plates or plate packs to extend an existing the heat exchanger. Each test takes approximately 30 to 35 sec. Every cassette is inserted in the chamber to check the tightness in order to detect any cracks or leakage through the plate surface and welding of the plate. In such a program, the first test begins with a helium-leak chamber. Semi-welded heat exchanger plates are helium leak tested in factory conditions multiple times to document correct gasket sealing and cassette tightness.
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This allows 100 percent of the semi-welded heat exchanger plates to be helium leak tested in factory conditions - multiple times - to document correct gasket sealing and the tightness of cassette. Helium testing is fully automated at some assembly facilities. Execute an external helium leak test to verify sealing capability to its surroundings.Conduct an internal helium leak test to verify the sealing capabilities of the ring and diagonal gasket to avoid product contamination.Perform a hydraulic strength test to reduce the health-and-safety risk.