Components such as valves, pumps, filters, degas modules, etc. are common sources of particles in a fluid handling system. Valves are typically found in sample collection locations where a liquid sample will be evaluated for various contaminants, including particles. Continuous moving parts in a pump create particles through friction, chemical degradation and cavitation. Filter testing is necessary to ensure that data driven decisions are made when selecting new filters. Degas modules, usually upstream of the filter, are used to remove gas from the liquid system.
| Major System Components and Representative Particle Sources | |
|---|---|
| Major Component Type | Sources of Particles |
| Filters | Filter media, media shock, tears, pinholes, fittings, flow path |
| Degas Modules | Degas media, trapped particles, fittings |
| Valves | Frictional forces, flow path, trapped particles, chemical breakdown |
| Pumps | Frictional forces, pulsing flow, chemical breakdown, cavitation |
A simple test station using the Ultra DI® 20 or Chem 20™ Liquid Particle Counters can be constructed to help determine which component type and supplier has the lowest particle shedding or generation. The setup includes a bypass line around the component under test to allow continuous flushing when the test piece is removed, thereby maintaining system cleanliness at all times. Testing liquid system components to ensure their cleanliness is a critical step toward achieving the lowest particle producing liquid distribution system.
Download the application note for the full analysis of a fluid handling system, where contamination is likely found within it, and how liquid particle counters can be implemented to find areas of improvement.
