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).
Fitting instructions and technical details for 'Wills' pressure-filled joint rings.
| Identifier | ExFiles\Box 86\1\ scan0086 | |
| Date | 10th August 1932 guessed | |
| JOINTING PROBLEMS. With the higher pressures which are constantly being used in the modern design of internal combustion engines, steam engines and their auxiliaries, jointing problems of the first magnitude are frequently being encountered. It is in this connection that the WILLS PRESSURE FILLED JOINT RING is particularly applicable for the following reasons :— 1. By its form and initial internal pressure it acts as a perfect cushion and sealing joint. 2. The use of the WILLS PRESSURE FILLED JOINT RING promotes accuracy in assembling cylinder heads and the like by enabling the designer to incorporate definite metal to metal contacts, using the Joint Ring purely for sealing purposes, as is shown in sketches on pages 5 and 13. 3. In practice, due to internal pressure, these rings expand slightly when the external pressure is released, thus enabling them to be used over and over again, and ensuring a perfect joint each time. The WILLS PRESSURE FILLED JOINT RING has a very wide range of application, in fact it may safely be said that wherever the space between flange or other faces is wide enough to permit of its use—from 1/8" upwards—it will be found the most satisfactory form of jointing material to use under practically any conditions. The rings may be made of copper, Monel metal or nickel, or other metals to suit varying conditions. 9 FITTING INSTRUCTIONS FOR “WILLS” RINGS. For a permanent or semi-permanent joint, assemblies such as shown on sketches C, D and E are recommended. For steam and other pipe lines for pressures up to 250 lbs. per square inch, where a rigid joint is required, washers should be placed on the bolts between flange faces as shown in sketch B. For joints which have to be continually broken and remade, no check washer or other limiting device should be used. Under these conditions, a small amount of follow up or additional compression of the ring is essential, and this can only be obtained if no limiting device is used. RINGS SHOULD NEVER BE FITTED IN SEMI-CIRCULAR GROOVES AS SHOWN IN SKETCH H.{Arthur M. Hanbury - Head Complaints} All grooves and recesses should be FLAT BOTTOMED, and should be at least 1/32" wider than the cross section of the ring tube. Rings should be fitted as near the bolt circle as possible to obtain best results. When rings are fitted close to the pipe bore on standard flanges, there is a tendency for the flanges to bend when pulled down, the ring acting as a fulcrum. The use of the “Wills” Ring in the position shown on Sketch E is applicable to specially designed heavy flanges. In general practise for pressures up to 2,000 lbs. per square inch, “Wills” Rings should be pulled down one-third of their cross section, that is to say, a ring made from 3/16" tube should be pulled down to 1/8" and in like ratio for all other sizes of tube. For higher pressures, the accompanying chart on page 20, gives the compression required to hold pressures up to 10,000 lbs. per square inch. FLANGED AND ALL JOINTING SURFACES SHOULD BE FREE FROM RADIAL OR TRANVERSE GROOVES, PITTING AND FOREIGN MATTER. NO PAINT, OIL OR OTHER JOINTING COMPOUND SHOULD BE USED WITH THE “WILLS” RING. 12 | ||