A-A-50455A
2.4.2 The pump shall be self-priming and shall operate with a minimum vacuum of 15 inches (38.10 cm) of mercury at the inlet.
2.4.3 Piping connections shall be assembled to minimize the potential for leakage. Connection requirements for inlet/outlet ports are listed in 2.7. SAE J514 connections are preferred for other fittings.
2.5 Filtration.
2.5.1 The 10 and 16 gpm (37.8 and 60.68 lpm) carts shall have two filter housings, connected in series, to provide dual filtration for both particulate and water contaminant removal. The 25 gpm (94.5 lpm) cart shall have only one filter housing to provide filtration for particulate removal. All filter housings for the 10, 16 and 25 gpm (37.8,
60.48, and 94.5 lpm) carts shall each be sized for dual filter elements (see 2.5.7). The filter housing and filter
element operating pressure rating shall be not less than 250 psi [1.723 megapascals (Mpa)] The filter housing burst pressure rating shall be not less than 1000 psi (6.895 Mpa) or 4 times the housing rating, whichever is greater.
2.5.2 The filter bowls shall be attached to the filter heads in a manner to permit removal and cleaning of the bowls and servicing of the elements without breaking pipelines,. The servicing requirements of the filters shall be simple and shall not require the use of special tools for removing, cleaning, replacing elements, and remounting filter bowls.
2.5.3 A bypass valve shall be contained within each filter housing. The bypass valve shall be fast-acting, single stage, and of high capacity design to protect the filter elements from excessive differential pressure under all transient and steady flows found in service.
2.5.4 The bypass valve shall have a cracking pressure of 35 to 40 psid (241.33 to 275.80 kPa) and a full flow pressure drop of 60 psid (413.70 kPA) maximum at rated flow with 215 cSt viscosity hydraulic fluid.
2.5.5 Maximum internal leakage of the bypass valve at 30 psid (206.85 kPA) differential pressure shall not exceed
3.66 cubic inches per minute (in3/min) (60 milliliters per minute (ml/min)) with 46 cSt viscosity hydraulic fluid.
2.5.6 The fluid flow through the filter elements shall be from the outside to the inside.
2.5.7 Filter elements.
2.5.7.1 For particulate removal, each filter housing shall accept two filter elements that are in accordance with SAE J2321/1.
2.5.7.2 For water removal, each filter housing s hall accept two filter elements that conform to the dimensions specified in SAE J2321/1. See 6.5.4 for guidance on water removal filter element selection.
2.5.7.3 The two elements installed in each housing shall be connected by the use of reusable element-connector that is in accordance with SAE J2321/1.
2.6 Differential pressure indicator (dirt alarm).
2.6.1 The filters shall be provided with a clearly visible mechanical differential pressure indicator. The indicator shall actuate either by direct mechanical linkage to the bypass valve or by the differential pressure across the filter elements.
2.6.2 The indicator shall reflect contaminate (particulate or water, as appropriate) buildup (pressure differential) in the elements and shall register against a three-color scale.
2.6.3 The three colors shall read:
a. GREEN OK (indicating full flow filtration).
b. YELLOW CHANGE (indicating full flow filtration, but element approaching by-pass condition). c. RED BYPASS (indicating hydraulic fluid bypassing the filter elements).
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