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}

b. High temperature operation. The SGNSC shall be operated and tested in accordance

with MIL-STD-81OE, Method 501.3, Section I; Section II-3.2 (Procedure II- Operation); and

Section II-4. The test temperatures shall be +80 F at 90% relative humidity (rh); +11O F at 80%

rh and +125 F at 50% rh. .4 twenty-four (24) hour soak is required at each test temperature. The

engine and the compressor shall both ingest conditioned air during testing. While under test, the

SGNSC shall meet the nitrogen gas production and quality requirements of para 7. of the CID for

three (3) consecutive hours at each of these temperature/humidity test levels. The test fuel shall be

JP-8. After the 3 hour test and at each test temperature, the SGNSC shall demonstrate the

capability to have 200 scf of nitrogen gas at 5000 psig available within twenty (20) minutes of the

nitrogen gas system engagement. Time to fill all high pressure receivers to a minimum of 600 scf

at 5000 psig shall not exceed 40 minutes. The receivers shall be empty at the start of each test at

each test temperature (vent to atmosphere).

Operation in a tilt position. The SGNSC shall meet the nitrogen gas production

and quality requirements of paragraph 7. of the CID for one (1) hour when tilted at 15 degrees in

any direction from the level position while at ambient altitude, temperature, and humidity. The test

fuel shall be JP-8. After the one hour test. and while still tilted 15 degrees, nitrogen gas

production shall be sufficient to have 200 scf of nitrogen gas at 5000 psig available within twenty

minutes of nitrogen gas system engagement. The time to fill all high pressure receivers to a

minimum 600 scf at 5000 psig shall not exceed forty (40) minutes. The receivers shall be empty at

the start of each test (vent to atmosphere).