A-A-50632A(SH)
TABLE I. Reference data.
Equipment/Characteristic |
Description |
Fluid type |
Fuel, lubricating oil |
0peration pressure (Design) |
150, 300, 600 psi |
Temperature range |
70 to 250oF |
Piping connections Inlet, outlet, screen compartment and sump clean-out. Gage, sump drain and vent |
150, 300, 600 rating ANSI B16.5 full face flanges SAE J 1926 |
Pressure resistance |
FCI 78-1 |
Flow capacity |
Para 3.4 per ISA-S75.02 |
Shock resistance |
MIL-S-901 grade A |
Vibration resistance |
MIL-STD-167-1 type I |
Airborne noise |
MIL-STD-740-1 grade C |
Motion & attitude resistance |
MIL-STD-1399 section 301 |
3.2 Design. Each self-cleaning simplex type strainer shall remove particulate contaminants from fuel or lube oil. The self-cleaning action shall be continuous, and shall have the ability to periodically backwash the strained fluid through the strainer element in segments such that the particulate contaminants are flushed free of the strainer element and down into a large sump. The self-cleaning action of each unit shall be driven by a hydraulic motor which uses strained system fluid as its sole source of power.
3.3 General construction. Each strainer assembly shall consist of a housing, strainer element(s) and self-cleaning mechanism(s). The cross-sectional flow area throughout the unit shall be equal to or greater than that of the piping to which the strainer is connected.
3.3.1 Cover. Cover shall be secured to the housing by nuts and bolts. The cover shall effect a positive seal on a gasket or 0-ring recessed in the cover. Removal of the cover shall provide access to all internal components and shall not require unbolting the inlet and outlet strainer piping connections. Cover lifting devices with integral supports shall be required for covers weighing more than 30 pounds. The strainer cover shall contain a device to deflect fluid spray downward in the event of seal failure. The spray deflector shall remain in position at all times while the strainer is pressurized.
3.3.1.1 Spray deflector effectiveness test. 0ne strainer of each type, class, size and specific design shall be subjected to this test. The strainer shall be centered in drip pan 3-inches deep and of a size and shape to allow 4-inches clearance around the periphery. The strainer cover shall be installed with an 0- ring which has been notched to cause leakage. The strainer shall be pressurized to maximum design pressure. This test shall be conducted 8 times with the 0-ring notch moved clockwise 45 degrees between tests. Failure to pass this test in any leakage position shall require redesign of the deflector and retest.
3.3.1.2 Inter-lock feature. The strainer cover shall contain a locking device to prevent disassembly while the unit is pressurized.
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