LOCKRING REMOVAL TOOL
TEST RESULTS OF THE ROSAN FLUID BOSS INSERT
TESTED AND APPROVED
The Rosan RF9500 series insert has been tested by the Naval Air System Commande Development Center.
The abstract of the Naval Test Report states “…The Ring Locked boss insert assembly, developed by Rosan and evaluated
to the requirements of MIL-F-18280 was found suitable for new design where interchangeability of the boss-insert in a
component is desirable. It is also suitable as a repair insert for damaged or worn bosses of hydraulic components, where
machining to the boss-insert dimension, is possible.”
THE TEST RESULTS
The Naval Test Reports the following results:
1. Proof Pressure – All assemblies satisfactorily withstood the 6000 PSI proof pressure test.
2. Flexural Strength – The two samples tested completed this test without any failures as shown in Table I.
3. Pressure Impulsing – The four test assemblies satisfactorily completed the 200.000 impulse pressure cycles without
failure, blow-off or leakage and withstood the subsequent 6000 PSI proof pressure test.
4. Thermal Shock – The four test assemblies previously subjected to flexural and impulse testing completed this test
without any leakage or other failure. One test sample, each size, thereafter was pressurized to 3000 PSI, 6000 PSI and
22,000 PSI respectively, without leakage or blow-off as shown in Table II.
| SIZE | COMBINED STRESSES (psi) |
CYCLES COMPLETED | COMBINED STRESSES To (psi) |
ADDITIONAL CYCLES | TOTAL CYCLES | REMARKS |
| -12 -16 |
30,000 30,000 |
10,300,000 10,200,000 |
35,000 35,000 |
1,400,000 5,350,000 |
11,700,000 15,550,000 |
TUBING RUPTURED TUBING RUPTURED |
MIL-F-18280 requires 10,000,000 flexural cycles
TABLE II – THERMAL SHOCK
| SIZE | 350°F 3000 psi |
-65°F 3000 psi |
75°F 6000 psi |
75°F 12,000 psi |
ULTIMATE BURST psi |
REMARKS |
| -12 -12 -16 -16 | NO LEAK NO LEAK NO LEAK NO LEAK |
NO LEAK NO LEAK NO LEAK NO LEAK |
NO LEAK NO LEAK NO LEAK NO LEAK |
NO LEAK NO LEAK NO LEAK NO LEAK |
22,000 22,000 | NO RUPTURE NO RUPTURE |
Original MS28778 O-ring used throughout testes in MS33649 configuration.
ACCEPTABILITY OF THE ROSAN FLUID BOSS INSERT
Many major companies have used the Rosan Fluid Boss Insert: Sikorsky Aircraft; General Electric, Lynn (T700 and F404 Jet
Engine Programs); General Electric Evendale (CF6 Program); Airesearch, Arizona; Purolator; Ronson Hydraulics; Aircraft
Gear; Western Gear; Sier Bath; Fenn Manufacturing; Indiana Gear Works and Menasco, to name just a few.
DESIGN CONSIDERATIONS
The parent material shear strength (Fsu), at operating temperature, should be in excess of those listed in the table
below, in order for the insert to function properly. Each insert has been designed to resist a burst pressure of four
times the system pressure when used as specified inthe table below.
| SYSTEM PRESSURE psi | PARENT MATERIAL SHEAR STRENGTH (AT OPERATING TEMP.) psi Fsu MIN | TUBING O.D. REF | INSERT SIZE |
| 3,000 3,000 |
12,000 14,000 |
1/4 THRU 1 1/8 THRU 1-1/4 |
04 THRU 16 02 THRU 2 |