Debris, clearance

Because of the very small bearing clearances in gas bearings, dust particles, moisture, and wear debris (from starting and stopping) should be kept to a minimum. Gas bearings have been used in precision spindles, gyroscopes, motor and turbine-driven circulators, compressors, fans, Brayton cycle turbomachinery, environmental simulation tables, and memory dmms. 

Bartl, MM, Luckenbach, T, Bergner, O, Ullrich, O, and Koch-Brandt, C, 2001. Multiple receptors mediate apoJ-dependent clearance of cellular debris into nonprofessional phagocytes. Exp Cell Res 111, 130-141. 

High-pressure diesel fuel pumps are not tolerant of dirt, debris, and organic deposits and can be seriously damaged by fuel contaminants. The barrel and plunger clearance is within a 1 to 2 micron tolerance. This tolerance is necessary to ensure that fuel injection pressures are maintained with minimal leakage past the plunger shaft. For this reason, thorough and complete filtration of fuel is required before the fuel reaches the injection pump. 

The oxidative clearance of the lipophilic drugs, metoprolol, timolol, and bufuralol, is influenced by the debri-soquine hydroxylation gene locus, resulting in polymorphic metabolism (233). This might result in an... 

Sometimes for large liquid rates, the downcomer skirt clearance is increased by recessing the bottom end of the downcomer into a sump built into the tray floor. Such a sump increases tray cost and may trap debris. 

The particulates of interest include hard sand, dirt and wear particles that are of the same size range as the machine oil clearances. The debris is generally in the range of 2-10 p,m. These particulate sizes cause most damage and often result in component failure. For acceptable oil performance and reliability, particulates in the oil must be periodically measured, evaluated and when appropriate, removed by filtration. 

Clearance of debris at Tunnel revealed that at the extreme western end of the workings, which was destined to be No.l storage District, there were two geological faults which made the stone very broken with a displacement in the strata of thirty feet. It was decided to abandon this area forthwith, with the consequential loss of four acres of storage space. 

Better progress was being made in the BSA area where clearance was virtually complete and two new twenty-foot-diameter ventilation shafts were being sunk. At the same time excavations began for the four shafts required in the east quarry. Development of the adjacent Pamall section was considerably less well advanced, with less than a quarter of the area cleared to the required headroom. Delays in this area were attributed to the fact that debris could only be evacuated via slope-shaft D , which was fully committed for some months to the removal of stone from the BSA area. 

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