Contamination Ingression Rate

Canonical Definition

The rate at which airborne particles, process contaminants, or wear debris enter a fluid system during normal operation, typically expressed as milligrams per hour (mg/h) or particles per hour at a defined size range. Ingression rate determines the steady-state contamination level achievable by a filtration system: a filter system reaches equilibrium when its removal rate equals the ingression rate. High ingression rate environments (dusty construction sites, mining, agriculture) require higher filtration capacity or more frequent service intervals than low ingression environments.

Engineering Context

Contamination ingression modelling is used to select filtration systems capable of maintaining target cleanliness codes under actual operating conditions. Key ingression pathways include: cylinder rod seals and breathers (primary for mobile hydraulics), reservoir vent breathers (primary for static systems), and maintenance contamination (tool cleaning, improper oil transfer). Seal integrity and breather filtration selection directly control the ingression rate.

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