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).
Letter from John Marston Ltd. discussing pressure test failures on a cooler and suggesting design improvements.
| Identifier | ExFiles\Box 131\1\ scan0252 | |
| Date | 5th December 1936 guessed | |
| From JOHN MARSTON LIMITED. To Messrs. Rolls-Royce Ltd., D E R B Y. (CONTINUED). The sides were then supported with clamps, the leak repaired, and the pressure again raised. At about 500 lbs per square inch the top had distorted in the middle very considerably and caused a leak at the point where the centre baffle id jointed to the top pressing. No tubes had collapsed and no leaks in between the tubes appeared. The side plates bulge appreciably under 200 lbs per square inch pressure but spring back again on releasing the pressure. Two pieces of 12 w.g. mild steel 2¼" square were sweated, one on each side of the cooler. On raising the pressure to 240 lbs per square inch no appreciable distortion occured. Fitted with these side supports, the cooler was much too wide to fit into the casting. Other modifications would therefore have to be made if this method of strengthening were adopted. The Harrison Cooler has side plate supports similar to these and also obtains additional support from the sides of the casting in which it is housed. When considering a revised pattern of these Oil Coolers therefore, the weakness of the side plates of the existing pattern should be borne in mind and some method of strengthening then adopted. We shall be glad to have your views on this matter and we shall be pleased to co-operate with you in eliminating this defect. Yours faithfully, For JOHN MARSTON, Limited, P.A.T. Yeats | ||