The diameter of the largest hard spherical particle that will pass through a filter under specified test conditions. This is an indication of the largest opening in the filter elements.



Related Terms

BUBBLE POINT

The differential gas pressure at which the first steady stream of gas bubbles is emitted from a wetted filter element under specified test conditions.

FABRICATION INTEGRITY POINT

The differential gas pressure at which the first stream of gas bubbles are emitted from a wetted filter element under standard test conditions.

OPEN BUBBLE POINT

The differential gas pressure at which gas bubbles are profusely emitted from the entire surface of a wetted filter element under specified test conditions. Also know as boil point.

BURST PRESSURE RATING

The maximum specified inside-out differential pressure that can be applied to a filter element without outward structural or filter-medium failure.

BRIDGING

A condition of filter element loading in which contaminant spans the space between adjacent sections of a filter element, thus blocking a portion of the useful filtration.

BETA RATING

the method of comparing filter performance based on efficiency. This is done using the Multi-Pass Test which counts the number of particles of a given size before and after fluid passes through a filter.

ABRASIVE WEAR

Abrasive wear is caused by hard particles such as ash deposits, metallic particles or catalytic fines from the cracking process of the fuel oil. These hard grains wear down the surface of cylinder liners and rings by continuous ploughing and scratching.
With higher levels of abrasive wear, the surface displays vertical scratches, the size of which depends on the dimensions of the particles involved. These particles can also affect the sides of the rings as they jam in the ring groove, thereby causing "pitting" of the surface. Harmful particles normally enter the engine via the fuel and careful attention to the fuel cleaning system is therefore of utmost importance. abbrasive wear pic

MANHOLE

An access opening to the interior, elliptical and 11 in. by 15 in. or larger or circular 15-in. diameter or larger.

AC FINE TEST DUST

(ACFTD) A test contaminant used to assess both filters and the contaminant sensitivity of all types of tribological mechanisms.

CUTTING WEAR

Comes about when hard surface asperities or hard particles that have embedded themselves into a soft surface and plough grooves into the opposing harder surface, e.g., a journal.

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