A-A-50455 Portable Filtration CartThis commercial item description covers the requirements for 10, 16, and 25 gallons per minute gpm 37.8, 60.48, and 94.5 liters per minute lpm rated flow capacity filtration carts used in transferring petroleum based, synthetic hydrocarbon, triaryl phosphate ester and polyglycol solution or aqueous hydraulic fluids into ship hydraulic systems, as well as cleaning the ships hydraulic systems that are contaminated with particulate, water, or both. It shall recirculate fluid in a contaminated system until cleanliness levels are attained which provide satisfactory component performance.

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A-A-50455A

2.7  Unit ports.

2.7.1  The unit shall be equipped with steel, interchangeable quick disconnect couplings conforming to Series B of ISO 7241-1 with SAE 11926/1 threaded O-ring seal ports for the coupler or nipple to hose connection according to the following schedule:

2.7.2  Coupling components shall be coated for general corrosion resistance; components shall not be cadmium plated.  Discharge coupling halves shall be valved.  The mating or hose ends of all quick disconnect couplings shall have boss porting (straight threads with grooving for O-ring seal) in accordance with SAE 11926/1. Location/orientation of unit ports shall comply with human engineering requirements of 2.17.2.

2.7.3  The suction port of the filter cart shall have a male/nipple type fitting.  The mating female/coupler hose fitting shall be provided.  Both coupling halves shall be provided with semi-restrained (lanyard or equal) dust plugs and dust caps.

2.7.4  The discharge port of the filter cart shall have a female/coupler type fitting.  The mating male/nipple type hose fitting shall be provided.  Both coupling halves shall be provided with semi-restrained (lanyard or equal) dust plugs and dust caps.

2.8  Gages.  Two gages meeting or exceeding the requirements of ASME B40.100, grade B, 2 to 2-1/2 inches (5.08 to 6.35 cm) in diameter shall be provided on the unit.  The gages shall be commercial marine grade, direct drive, helical, multi-wound, Bourdon tube type with minimum 1% accuracy at mid-range and all components corrosion resistant.  Both gages shall be securely mounted to the unit and shall be visible to the operator while the unit is in use.  The gage line to each gage shall be equipped with a gage isolation/vent valve.  The gages shall be connected to the unit piping with SAE 1514 straight or pipe thread fittings as follows.

2.8.1  One gage shall have a range of 0 to 200 psi (0 to 1.379 MPa) and shall be connected to the pump discharge piping or filter inlet so that pump discharge pressure can be monitored.

2.8.2  The other gage shall have a range of 0 to 30 inches (0 to 76.20 cm) of mercury and shall be connected to the pump in let piping or the suction inline strainer or separator outlet connection so that pump suction (vacuum) condition can be monitored.

2.9  Fluid vent/test valves and sampling valve.

2.9.1  Fluid vent/test valves .  Vent/test valves shall be provided as necessary to support validation of pressure drop across the pump and to support fluid sampling.  Valves shall satisfy MIL-V-24695/1, but allow use of carbon steel as an alternative material.  Location of fitting that supports fluid sampling shall comply with human engineering requirements of 2.17.2, permit attachment of fluid sampling valve, and support fluid sampling downstream of filter assembly that is downstream of pump.

2.9.2  Fluid sampling valve.  A minimum of one fluid sampling valve shall be provided per MIL-V-81940/4.

2.10  Seals .  O-ring seals shall be fluorocarbon rubber and shall conform to SAE AS3581 (for seals that are subject to twisting or abrasion, such as boss seals) or SAE AS3209 (for other seals).

2.11  Fasteners.  Fasteners shall be identified and selected in accordance with the requirements of SAE 12280.

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