Heat exchanger leak detection / plate dye test
The VGH 100% dye test is our standard for locating cracks, pinholes or faults. Using a proprietary red dye penetrant to saturate the surface of the board and cover the white developer solution on the reverse side, VGH is able to detect even tiny flaws. We test 100% of the boards for service, and most competitors only test a percentage. Consider that 90% of the test boards have a 10% failure rate. Basically, a random inspection of 10-20% cannot eliminate all the bad boards that VGH guarantees before leaving our factory. Although dye testing is the most time-consuming and expensive leak detection method, VGH chose the reliability and effectiveness of the process. Early detection of board defects can alleviate cross-contamination issues and save costly downtime.
Other non-destructive testing methods used occasionally by VGH
UV test Ultraviolet testing is available on request and is usually a special application where fluid media can only be detected under ultraviolet light. One side of the spray plate is sprayed with a unique dye penetrant and then inspected under UV light to show cracks, pinholes or failure.
Vacuum test The vacuum test of the plates is used for welded and semi-welded heat exchanger plates. The dye penetration method cannot be used with these plate types. This method will detect the board for leaks, but it will not identify the location of the failure.