CLS Lubricant Storage, Handling & Contamination Control Flashcards

Target cleanliness levels for hydraulic systems are typically specified using which international standard?

Answer: ISO 4406

ISO 4406 provides the particle count cleanliness code system used to set and verify hydraulic system fluid cleanliness targets.

Which filtration rating specification directly describes a filter's ability to remove particles of a specific size under multi-pass test conditions?

Answer: Beta ratio (βx)

The Beta ratio (βx) from ISO 16889 multi-pass testing quantifies how many particles of size x are upstream versus downstream of the filter.

When transferring lubricant from a bulk storage tank to a machine reservoir, which practice most effectively minimizes particle contamination?

Answer: Filtering through a kidney-loop filtration unit rated to system target cleanliness

Kidney-loop filtration at the point of transfer removes particles introduced during storage and handling before oil enters the machine.

What does the term 'ingression rate' refer to in contamination control?

Answer: The rate at which contaminants enter a lubricated system

Ingression rate quantifies how many particles per unit time enter a system from external sources such as breathers, seals, and fill ports.

Which property of a lubricant storage room environment has the greatest impact on moisture contamination of hygroscopic lubricants?

Answer: Relative humidity

High relative humidity accelerates moisture absorption into hygroscopic lubricants like polyalkylene glycols (PAGs) and some synthetics.

A lubrication technician notices that grease dispensed from a grease gun appears to have separated into oil and thickener. What is the most appropriate action?

Answer: Discard the separated grease and thoroughly clean the gun before reloading

Oil separation (bleed) indicates degraded grease that will not perform correctly; the gun must be cleaned to avoid contaminating new grease.