Humidity Considerations in Filter Testing Based on Analysis of Filters from Gas Turbine Applications

Depth filters used in multistage filter systems adeptly clean the intake air of gas turbines, preventing damage and increasing performance. However, estimation their service life is based on empirical data and/or standardized testing procedures, e.g., ISO 16890. By applying synthetic test dusts at constant reference humidity, these procedures do not reflect application-typical loading conditions. Based a direct comparison with field data, influence temporary exposure to high relative humidity differential pressure particle deposit structure investigated. The results indicate that simulating variations ambient atmosphere during tests leads deposits, which more accurately actual behavior operation.