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

6.4.8  NFPA.  National Fire Protection Association (NFPA) standards and National Electrical Code articles are available from NFPA, 1 Batterymarch Park, Quincy, MA 02169-7471 or online at www.nfpa.org.

6.4.9  SAE.  SAE standards are available from SAE World Headquarters, 400 Commonwealth Drive, Warrendale, PA  15096-0001 or online at www.sae.org.

6.5  Explanatory and guidance information.

6.5.1  To minimize filter element replacement during system fluid cleaning or transfer and to support filter element replacement using the National Stock System sources, SAE J2321/1 filter elements having a higher capacity [30 gpm (115 lpm) as compared to 25 gpm (95 lpm)] have been specified.

6.5.2  The carts described by this document are not intended for use in Class I, Division 1 hazardous spaces, as defined in National Electrical Code Article 500, except when the potentially hazardous systems are out of service and subject compartments are certified as being free of volatile vapors.

6.5.3  MIL-V-24695 compatible vent/test valves and MIL-V-81940 sampling valve(s) have been specified for interchangeability, standardization and parts support with similar applications on USN and USCG ships.

6.5.4  The following suggested minimum requirements provide guidance in the selection of water removal elements to be used with the portable filtration cart:

Rated flow with 68 cSt petroleum based fluid:      10 gpm (37.8 lpm) Water retention capacity:                                        24.41 cu.in. (400 mL)

Terminal pressure drop:                                           25 psid (172.38 KPad) at rated flow Clean element pressure drop:                                  10 psid (68.95 KPad) at rated flow Collapse burst pressure:                                           150 psid (1.034 MPad) psid

Reverse flow pressure:                                             15 psid (103.43 KPad)

Bubble point:                                                            2 inches (5.08 cm) of water

Initial dryness level of hydraulic fluid:                  300 ppm of water (0.03% by volume)

6.6  Key words.

Filter bowl Filter element Filtration

Preparing Activity: Navy - SH

(Project 4330-0188-000)

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