7.
Examine the face runout and radial runout with the part rotated to four approximately equally spaced locations.
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Runout and Tooth Bearing Pattern Check (Full Tooth
Bearing Pattern Acceptance Specifications)
Figure 325
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Runout and Tooth Bearing Pattern Check (Localized
Tooth Bearing Pattern Acceptance Specifications)
Figure 326
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J. Abraded, Plasma Spray, or Metal Spray Surfaces Inspection
Refer to applicable manual for unit in work.
K. Bubble Point Check for Filters
(1) Perform bubble point test on filter in accordance with MIL-F-5504B.
(a)
The largest pore size of filter media can be experimentally determined by a Bubble Point Test. This is accomplished by measuring the pressure necessary to force air through media submerged in a known fluid. The surface tension of the fluid covering each pore prevents an indiscriminate permeation of the element.
(b)
The Bubble Point Test apparatus shall be similar to that illustrated in Figure 327. A filter element is submerged approximately 0.5 inch (12,7 mm) below the surface of a test fluid. The media is subjected to air pressure, which is increased in small steps until bubbles emanate from a point on the media surface.
(c)
The element is rotated 360 degrees about its longitudinal axis at each increment of air pressure so the entire element can be observed for the appearance of the first bubble, at which time the manometer reading is taken. The pore size is inversely proportional to the pressure at the point the bubble appears and is determined by the following formula:
Fluid Constant, microns / in. H20 Pore Size -Microns = Fluid Pressure -Depth between fluid surface and media (in. H20
(d) Test fluids most commonly used are Solox 190, ethyl alcohol, methyl alcohol, and red oil (MIL-H-5606). Red oil (MIL-H-5606) is used when paper media is being tested to prevent swelling or other damage to the media. Constants for various test fluids have been determined as follows:
Solox 190 356 Methyl Alcohol 231
Ethyl Alcohol 238 MIL-H-5606 265
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Table 307. Filtration Terms and Definitions
Term Explanation
Absolute The minimum particle size which is collected 100 percent by the filter.
Affluent Fluid entering the filter.
Bubble Test A method for locating and measuring the largest pore through a filter media by determining the minimum pressure required to force air through the media wetted by a specified fluid.
Capacity-Dirt Holding The amounts of specified test contaminant, usually measured by weight in grams, required to produce a given pressure drop under specified test conditions.
Capacity-lnput See capacity-dirt holding.
Configuration The shape of the filter housing.
Contaminant The foreign matter or particles in a fluid.
Cryogenics The science of super cold liquids such as liquid oxygen, liquid nitrogen, and liquid hydrogen.
Effluent Fluid that passes a filter.
Element Filter media and support as used in the filter assembly. Characterized by construction, pleating configuration, and size.
Filter The filter assembly, consisting of a housing and element.
Filter Area-Effective The area of media that is useable for filtration.
Filtration-Degree of The level of cleanliness of a fluid measured in terms of microns.
Filtration-Depth Type Filtration which is accomplished in depth. The actual pore size of a media may be larger than the desired degree of filtration, but because of its depth, it provides a tortuous path with many entrapments to catch foreign particles.
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