monitor elements and housings.

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MIL-PRF-81380E

3.4.3 Air eliminator. The filter vessel shall be fitted with a means to automatically vent

trapped air from the vessel.

3.4.4 Drain valve. The filter/monitor housing shall be equipped with a manual drain valve

(or valves) to provide for complete drainage of each compartment.

3.4.5 Pressure gage. A pressure gage shall be provided to measure the pressure drop

between the inlet and outlet compartments of the housing (see 6.4.2). The gage shall be a non-

magnetically operated direct reading differential pressure gage.

3.4.6 Pressure rating and relief valve. The filter/monitor housing shall have a design

pressure rating equal to or greater than the higher of the following: the maximum working

pressure of the fuel system; 150 psig (1034.1 kPa); or as specified in the contract (see 6.2). The

vessel shall be designed with a pressure relief valve to ensure that its maximum working pressure

is never exceeded. The unit shall be constructed and labeled in accordance with ASME, Boiler

and Pressure Vessel Code, Section VIII.

3.4.7 Clean-out connections. All parts of the vessel shall be accessible for inspection and

cleaning. Access may be from the main cover, or a specially installed clean-out connection. The

clean-out connection itself shall not constitute a water trap. Removal of the vessel's inlet or

outlet piping is not an acceptable method.

3.4.8 Element spacing. Touching of elements to each other or the vessel wall shall be

avoided. The design layout of elements in the vessel shall provide a minimum clearance of 0.25

in. (6.4 mm) between elements and between the elements and the vessel wall.

3.4.9 Exterior. Prior to shipment, the exterior of the vessel shall be cleaned of all dirt,

grease, rust and loose mil scale, and one coat of a metal primer applied, unless otherwise

specified in the contract. All nameplates, gages, etc. shall be masked prior to painting.

3.5 Performance characteristics.

3.5.1 Hydrostatic pressure. The complete filter/monitor housing shall withstand a

hydrostatic pressure in compliance with ASME, Boiler and Pressure Vessel Code, Section VIII.

The interior deckplate shall withstand a hydrostatic pressure equal to the design pressure, applied

to the inlet side with all element mounting holes sealed. Testing shall be in accordance with

4.5.2.1.

3.5.2 Structural integrity. The filter/monitor element shall withstand a three-foot (91.4 cm)

drop without structural failure when tested in accordance with 4.5.2.2.

3.5.3 Media migration. When analyzed, the effluent shall contain an average of not more

than 10 fibers per liter (see 6.4.3) and the number of fibers in any single sample shall be not

greater than 15 fibers per liter when tested in accordance with 4.5.2.2.