METALLIC BOSS SEAL EVALUATION AND TEST PROGRAM.
Bi-monthly progress rept. no. 5, 1 Jan-1 Mar 61,
REPUBLIC AVIATION CORP FARMINGDALE N Y
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Thermal cycling tests using NAVAN stainless steel seals in stainless steel assemblies showed good performance during the first two series of thermal cycles however, performance decreased in subsequent tests apparently as a result of disassembly and reassembly between series. Thermal cycling tests using 14-inch aluminum unions indicated that the unions could withstand an operating pressure of 2000 psi at 400F but failed at an operating pressure of 4000 psi. Titanium unions assembled in stainless steel bosses with NAVAN stainless steel tees showed satisfactory performance in thermal cycling tests. Repeated assembly tests showed that although the NAVAN aluminum seals withstood a higher tightening torque than the USAF X59C6184 seals, the sealing ability of the latter at lower torque values was equal to that of the NAVAN seal. Vibration test results on assemblies made up of combinations of aluminum and carbon steel and with NAVAN and X59 aluminum seals showed satisfactory performance at room temperature and at 400F. Author