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

2.2.2 The electric mo tor, coupling, and pump shall be accurately aligned and designed to accommodate the residual misalignment found under typical service conditions.

2.2.3 The unit shall operate in either the vertical plane or the horizontal plane. Vertical orientation shall be assumed as the primary orientation.

2.2.4 The unit shall be constructed of the materials that are compatible with petroleum based, synthetic hydrocarbon, triaryl phosphate ester and polyglycol solution or aqueous hydraulic fluids as referenced in SAE J1778.

2.2.5 The unit shall be equipped with a drip pan below potential sources of fluid external leakage (filter assemblies and inlet/outlet ports) to provide adequate fluid containment that keeps the working area safe and clean while the unit is being operated in the vertical orientation.

2.2.6 Provision shall be made for attachment of a chain hoist, multi-point sling, or equivalent rigging device for rigging a fully loaded unit (wet weight) vertically through a hatch or horizontally through a doorway. Where a wide handle assembly also serves as the lifting point, provision shall be made to limit shifting of the cart weight when lifting with a single chain hoist hook. Handles or similar devices shall be provided for use by personnel during the vertical transit through a hatch or horizontal transit through a doorway. Any equipment handles provided on the unit shall be sufficiently rugged to withstand lifting use.

2.3 Electrical.

2.3.1 Electrical controls shall be in accordance with NEMA standard MG1 and IEEE standard 45. Electrical enclosures shall meet the requirements of NEMA standard 250, Type 4X.

2.3.2 Electrical power requirements for the cart rated flow shall be as follows:

TABLE I. Power requirement.

Rated flow

Motor hp

Electrical power

10 gpm

(37.8 lpm)

1.00 hp Max

(0.746 kW Max)

115 volts, 60 Hz

16 amp draw (max) under full load, single phase

16 gpm

(60.48 lpm)

1.50 hp

(1.119 kW)

25 gpm

(94.5 lpm)

3.00 hp

(2.238 kW)

440 volts, 60 Hz

10 amp draw (max) under full load, triple phase

2.3.3 Electrical motor shall be a totally enclosed fan cooled (TEFC) type and shall be rated for continuous duty.

2.3.4 An oil-tight, permanently mounted, on/off switch shall be provided.

2.3.5 A hard service cord of 24 inches (0.61 m) minimum length, conforming to National Electrical Code (NFPA

70) type SO or equivalent (heavy duty, oil-resistant) cord, with a ground cable capable of conducting the full load motor current shall be provided. One end of the cord shall be permanently attached to the filter unit with strain relief. The other end shall be fitted with a National Electrical Code Article 410 type, three-prong (single phase) or four-prong (triple phase), dead front plug.

2.4 Hydraulic fluid delivery.

2.4.1 An integral part of the unit shall be a positive displacement pump capable of delivering rated flow of hydraulic fluid at 215 centistokes (cSt) viscosity and 100 pounds per square inch (psi) [689.5 kilopascals (Kpa)] minimum pump discharge pressure continuously. The rated flow of the unit shall be 10, 16, or 25 gpm (37.8, 60.48, and 94.5 lpm) as specified by the contracting activity. A tolerance of ±7 percent of rated flow shall be allowed to accommodate for variation in pump efficiencies.