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).
Oil pressure trials conducted on different types of oil coolers.
| Identifier | ExFiles\Box 150\3\ scan0058 | |
| Date | 6th May 1936 guessed | |
| Rolls Royce Oil Pressure Trials. Requirements. Pressure tests of Oil Coolers received to :- 200 lbs/sq.in. cold oil. 150 lbs./sq.in. oil at 130°C. ---------------- O.33. This Oil Cooler was arranged as shown and filled with coil oil. The pressure was steadily increased until a leakage of oil was noticed at a soldered joint on the honeycomb face of the cooler. The pressure gauge recorded 150 lbs. per sq. inch at the time. O.32. The same procedure was adopted as for O.33. At 195 lbs. per sq. inch the end casting bulged approx. 3/32" and a tube joint finally burst at 198 lbs. per sq. inc. O.34. The cooler withstood a pressure of 260 lbs. per square inch with no apparent damage so the trial was repeated using the same oil but at a temperature of 130°C (266°F). A tube joint burst at a recorded pressure of 200 lbs. per sq. inch or 50 lbs. per sq. inch above the limit specified for the hot oil pressure. NOTE : No labels were attached to the Cooler so the types are not known other than by their formations which were briefly as follows :- C.32 Seamed oval tubes with strip grills. - Gallay. C.33 Honeycomb with 210 tubes - Latest Phantom III.-Lec. 4386 C.34 Honeycomb with 293 tubes - Original Phantom III Lec. 3763 --------------------------- | ||