ISO 29461-2 is an international standard that specifies the test methods for determining the water endurance performance of air filter elements used in air intake filter systems for rotary machinery, such as stationary gas turbines, compressors, and other stationary internal combustion engines.
As the first rating standard for assessing the tolerance of gas turbine intake filters under water mist conditions, it is crucial for ensuring the safe operation of gas turbines in complex environmental conditions like rain, haze, and high humidity.
Before the introduction of this standard, gas turbine intake filtration systems often faced industry challenges such as a significant increase in pressure differential under high humidity conditions, including rain and haze, which impacted the safe operation of the equipment. However, few filter manufacturers tested the drainage performance of filters, leading to difficulties in selecting appropriate filters.
The ISO 29461-2 standard outlines a series of requirements for testing methods, including general testing conditions, testing equipment, testing procedures, and final reports.
During the testing process, the filter element is exposed to a certain amount of water droplets, the size of which depends on the rated air volume, with the relative humidity of the environment remaining above 95%. After three hours of spraying, the amount of water passing through the filter is measured, and the water vapor separation ratio of the test sample is recorded. Simultaneously, the increase in filter pressure drop during the testing period is noted. A higher water separation ability of the filter results in a smaller increase in pressure drop during testing, indicating better suitability for use in areas with high intake water content.
