A-A-52472A
3.1.2 Bowl. Type II filter bowl material shall be brass, annealed, Unified Numbering System (UNS) C24000, C26000, C26800 per ASTM B36/B36M, or zinc coated steel strip, carbon, cold rolled per ASTM A109/A109M. Steel bowls shall be treated with a corrosion resistant inhibitor per ASTM
D6386.
3.2 Design and construction. Unless otherwise specified in figure 1, the design and construction of the filter assembly shall be in accordance with the manufacturer’s specifications/drawings. The cover and bowl for the type II filter shall have a provision for and secured together with lockwire.
3.2.1 Filter element. The filter element shall be of the fine filtration type.
3.2.2 Servicing. Servicing, including cleaning and reassembly, shall be easily accomplished without disturbing the filter assembly connection to the engine and shall be designed to prevent improper assembly.
3.3 Performance.
3.3.1 Pressure-temperature resistance. The filter assembly shall be pressure tested at -65±3 degrees Fahrenheit (°F), 80±3 °F, and 160±3 °F. Test fluid used for the -65 °F and 80 °F tests shall be a mineral/petroleum spirit solvent having 100 °F minimum flash point (see 3.3.3). Air shall be used for the 160 °F test. For all tests, the pressure shall be applied for 5 minutes and reduced to zero. At a pressure of 15 psi, the type I filter assembly shall show no signs of leakage or permanent deformation during and after the pressure test. The type II filter assembly shall show no signs of leakage while submerged in water under an air pressure of 300 psi and, afterwards, shall show no signs of permanent deformation.
3.3.2 Flow rate. The flow rate of the filter assembly shall be 10 gallons per hour (gph). The maximum pressure differential across the filter assembly shall not exceed 4 inches of water.
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