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 three different types of oil coolers.
| Identifier | ExFiles\Box 131\1\ scan0215 | |
| Date | 27th August 1936 | |
| 27th August, 1936. 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. - - - - - - - - - 0.33 This Oil Cooler was arranged as shown and filled with cold 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. 0.32 The same procedure was adopted as for 0.33. At 195 lbs. per sq. inch the end casing bulged approx. 3/32" and a tube joint finally burst at 198 lbs. per sq. inch. 0.34 This 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 Coolers so the types are not known other than by their formations which were briefly as follows :- 0.32 Seamed oval tubes with strip gills. - GALLAY. 0.33 Honeycomb with 210 tubes. Subst PIII - Lec. 0.34 Honeycomb with 293 tubes. ORIGINAL PIII - Lec 3763 - - - - - - - - - | ||