From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
The compression and internal pressure testing of three Monel metal rings.
| Identifier | ExFiles\Box 86\1\ scan0081 | |
| Date | 12th October 1932 | |
| THREE MONEL METAL RINGS WERE TESTED AS DESCRIBED BELOW: Two of the rings were tested as described in our report (Ref. No. Eng. Dept. /GPF /CJ, Oct. 12th, 1932). They were placed between two plane steel surfaces in a compression testing machine and loaded initially until the axial thickness was reduced from 3/16" to 5/32". Pressure was then applied inside the ring until leakage occurred. The axial load was then increased and the test repeated. In the case of GQQ 1 a water pump was used for supplying the internal pressure and the ring was not burst at the highest pressure given by the pump. Ring GQQ 2 was tested in the same manner, but an oil pump and screw ram was used to supply the internal pressure until the ring was burst. The third ring GQQ 3 was tested in the same manner, but the plane surfaces were machined to represent the recessed joint flange shown in page 5 of the descriptive pamphlet supplied by the makers. In this case the initial load applied was sufficient to reduce the axial thickness of the ring to 5/32". Internal pressure was then applied until leakage occurred. FIG. 1. FIG. 2. Both the wheel valves shown on the illustrations are fitted with "Wills" rings as renewable seat. TABLE 1. DIMENSIONS OF RINGS. No, Eng. Dept. Test Mark. | Weight Grams. | Diameter : Inches. | | Axial Thickness : | | Inches. Average. | | Outside. | Inside. | Max. | Min. | GQQ 1 .. | 29.35 | 3.735 | 3.355 | 0.190 | 0.187 | 0.1895 GQQ 2 .. | 29.2 | 3.75 | 3.36 | 0.190 | 0.185 | 0.189 GQQ 3 .. | 29.45 | 3.725 | 3.355 | 0.1895| 0.1845| 0.1885 4 17 | ||