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).
Tests of sample oil coolers with the latest strengthening modifications.
| Identifier | ExFiles\Box 131\5\ scan0014 | |
| Date | 10th November 1937 | |
| To Hs.{Lord Ernest Hives - Chair} from Rm{William Robotham - Chief Engineer}/Std. c.c. By.{R.W. Bailey - Chief Engineer} c.c. Dr. c.c. RRC. c.c. Rd. c.c. Ex. c.c. Roy.{Sir Henry Royce} 1114 Report on Tests on sample oil coolers with all latest modifications - Further to Rm{William Robotham - Chief Engineer}/Std.3/WH.1.11.37 and Rm{William Robotham - Chief Engineer}/Std.6/WH.8.11.37. As mentioned in above memos, five sample oil coolers incorporating all strengthening modifications which we know of, - i.e. dip soldering, squared up and lengthened tube bulges and corrected profile casing plates - have been built up for tests purposes. We have now completed tests on these units. The tests carried out consist of - (1) Raising internal pressure to 200 lbs/sq.in. 1000 times. (2) Raising internal pressure by 50 lbs/sq.in. increments from 200 lbs/sq.in. until leakage occurs. Actual results of these tests are shown on attached sheet. After these tests were completed one of the five coolers was fitted to No. 5 test bed for further endurance running. The other four were sectioned for examination of the solder bond. Conclusions. All five coolers withstood the first test satisfactorily, this represents much more severe treatment than they can get in service. Of the four coolers tested to destruction three withstood 350 lbs/sq.in. (at approximately 5 times the actual maximum pressure attainable in service) before failure occured. The fourth developed a slight leak at 300 lbs/sq.in. due to porosity in the brass bottom plate (we have never had this | ||