Filter Integrity Testing Without Capital Expenditure

For many filter users, it’s crucial, if not essential, to have a method for testing your filters to ensure their proper functioning. This test can be conducted before filtration to verify that the process will operate as intended, or after filtration to check for any issues that may have arisen during processing. In some critical applications, it may be beneficial to perform both types of tests. The most prevalent method involves conducting a filter integrity test.

The Benefits of Integrity Testing

In the absence of filter integrity testing, users rely on post-process testing to ensure product quality. However, if quality tests fail due to a malfunction, it could lead to costly rework or even the scrapping of the entire batch.

System operators are generally aware of the advantages of integrity testing. However, smaller system operators may be hesitant to implement it due to the potential capital investment involved. The cost of an automated integrity tester can be substantial, with new ones costing upwards of $25,000 and used ones starting at $10,000. This high cost may not be justified by the potential financial losses associated with quality issues or product failures caused by filter malfunctions.

Fortunately, these customers have access to manual integrity test methods that can be implemented with a relatively small investment.

Manual Integrity Testing

There are several manual integrity test methods available. For hydrophilic filters, forward flow diffusion, bubble point, or pressure decay tests can be used. For hydrophobic filters, a water intrusion test can be employed. The equipment required for some of these tests, such as bubble point, pressure decay, and water intrusion, can be as simple as an air pressure regulator and calibrated pressure gauge, which you may already have on-site. Implementing a diffusion test, however, necessitates a mass flow meter, which, while still an investment, remains a fraction of the cost of an automated test system.

Manual integrity testing is easy to set up and reproduce, making it a cost-effective option for deploying across multiple systems. Unlike automated systems, manual testing eliminates the risk of an automated system being tuned to filters provided by the test system supplier. Additionally, manual testing can accommodate special test parameters that may not be fully compatible with filters from different suppliers.

Need Help Identifying an Appropriate Test?

Critical Process Filtration has assisted numerous customers by providing written instructions for conducting “manual” integrity testing. Our team of expert engineers is available to assist you in selecting the appropriate test for your process and the necessary equipment to perform only the required tests. Additionally, we have posted generic instructions for all the tests mentioned above on our website’s Product Resource Center.

We can also customize these instructions to suit your specific requirements.

Critical Process Filtration’s Applications and Process Support staff are here to assist you in identifying and implementing the appropriate test for your unique process. This includes test selection, equipment requirements, installation recommendations, and other necessary support to ensure a swift and cost-effective implementation.

For more information contact CustomerService@criticalprocess.com.