A-A-58019 Self Generating Nitrogen Servicing Cart \(Sgnsc\)This CID covers a SGNSC which can be towed over unimproved surfaces and transported by helicopter and fixed wing aircraft. It will be used to produce 95 percent pure nitrogen gas at 5000 pounds per square inch gage \(peig\) at a rate of 1511 standard cubic feet per minute \(acfn\) . The nitrogen gas will be used to service tires, struts, accumulators, and to fill external receivers. A bid sample test is required of the offerer. This CID contains Appendix A, Bid Sample Test Requirements; Appendix B, Bid Sample Test Report Requirements; and Appendix C, Certificate Format.

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A-A-58019 (USAF)

d. A method shall be provided to prevent the entry of back pressure to the receivers in the

event receiver pressure is lower than the equipment being serviced.

e. There must be a method to prevent the entry of high pressure nitrogen gas into the low

pressure nitrogen gas system.

f. The receivers shall not be installed by welding. installation shall be field removable

and/or replaceable.

10. Pressure Outlets. One low pressure outlet (0-350 psig) and one high pressure outlet (350-

5000 psig) at or near the control panel are required for nitrogen gas. The design of the outlets

shall prevent connecting the low pressure hose to the high pressure nitrogen outlet.

11. Metered port. One metered port with shutoff valve is required for connecting a portable

oxygen gas analyzer. The metered port must be located on the maintenance panel. The metered

port shall be compatible with the portable oxygen gas analyzer selected for use.

12. Air separation module.

a. The air separation module shall be a hollow fiber membrane which can be functionally

integrated with either oil-lubricated, oil-free, and/or oil-less type compressors.

b. The membrane shall incorporate the necessary piping/plumbing and controls to isolate

and by-pass the membrane and filter by connection of a high pressure line or hose.

c. Coalescent filters shall be installed on the air feed line to the membrane (to prevent

contamination of the membrane) and immediately before the receivers. Oil free and oil-less type

compressors are exempt from meeting this salient characteristic.

13. Operation in tilted position. The SGNSC shall function satisfactorily in a level position

(horizontal oosition) and while its plane of operation is 15 degrees from horizontal in any

direction.

14. Engine.

The engine shall be multi-fuel capable with JP-8 as the

primary fuel.

The SGNSC engine shall be compatible with fuels JP-5; DF-1; DF-2; JET A; and JET A1 for start

and operation.

b Fuel tank capacity shall be sufficient to permit operation of the engine for 5 hours

continuous operation under load without refueling using JP-8.

c. The engine shall be capable of unaided start and operation at 24 hour soaked

temperatures from -25 F to +125 F. Three unaided starts at-soaked temperatures down to -25 F.