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 blowing out test of Wills Pressure Filled Joint Rings, with details of a test piece from the British Industries Fair.
| Identifier | ExFiles\Box 86\1\ scan0083 | |
| Date | 10th August 1932 | |
| Page 6: [Image of a pressure gauge and test piece] Text on image: 14,000 Lbs. Per Sq. Inch NOTE THE PRESSURE STEEL-TUBE Budenberg Gauge Co. Ltd. Broadheath, nr. Manchester This TEST PIECE is fitted with Wills Patent Joint Rings 1 On the Joint between Top & Bottom Plate 2 On Gauge Joint The Pressure Medium used being Oil The illustration is of a test piece exhibited on our stand at the British Industries Fair at Castle Bromwich, Birmingham, 1934. It consists of two flat plates with a distance piece placed between the plates and the Patent Pressure Filled Joint Ring placed inside. This in effect gives the same results as placing the ring in a groove. The pressure held, as will be noticed, is 14,000 lbs. per square inch, and the medium used to obtain this extraordinarily high pressure was a standard grade of lubricating oil forced in through the hole in the base plate, the pump being afterwards removed and the hole plugged. “Wills” Patent Pressure Filled Joint Rings are also fitted to this plug, and the base of the pressure gauge, as sealing members. It is interesting to note that the daily temperature on the test piece during the Fair gave a variation of approximately 3% due to changing barometric conditions. Page 15: NATIONAL PHYSICAL LABORATORY. Report on tests of Joint Rings submitted by MESSRS. WILLS PRESSURE FILLED JOINT RING, LIMITED. RESULTS OF BLOWING OUT TEST. COPPER RING. GMF. 1. Torque required to tighten Joint . . . . . 1,520 in. lbs. Average thickness of Joint Ring before test 0·186 in. ” ” ” ” after ” 0·171 in. Pressure maintained at 250 lbs. sq. in. and temperature from 1,020 to 1,080 degrees F.{Mr Friese} for 25 minutes. NO LEAKAGE OBSERVED. MONEL METAL RING. GMF. 2. Torque required to tighten joint . . . . 1,680 in lbs. Average thickness of Joint Ring before test 0·188 in. ” ” ” ” after ” 0·182 in. Pressure maintained at 250 lbs./sq. in. and temperature from 1,040 to 1,090 degrees F.{Mr Friese} for 20 minutes. NO LEAKAGE OBSERVED. J.{Mr Johnson W.M.} E.{Mr Elliott - Chief Engineer} PETAVAL, Director, per H.{Arthur M. Hanbury - Head Complaints} GOUGH, Superintendent, Engineering Dept. Date :- 10th August, 1932. | ||