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).
Instructions and diagrams for fitting various types of permanent and semi-permanent joint assemblies and rings for piping.
| Identifier | ExFiles\Box 86\1\ scan0085 | |
| Date | 10th August 1932 guessed | |
| Further in this connection, when using the joints between plain flanges, should a joint in a line of piping require replacement, it is only necessary to remove a sufficient number of bolts to allow the old ring being taken out and the new one put in place between the flanges. With jointing materials in common use to-day, in the event of a failure of a joint, which does occasionally occur even with the best of materials, it is usually necessary to remove the pipe, clean off the flanges of the two joints, and remake both. Particular attention is drawn to the use of the ring in a recess enabling a metal to metal joint to be made, as shown by the various sketches on page 13, and referred to in the fitting instructions on page 12. GAS FILLED. Fitting instructions for permanent or semi-permanent joint assemblies, such as shown in sketches C, D and E, are recommended. For steam and other pipe lines at pressures up to 250 lbs. per square inch where a rigid joint is required, washers should be placed on the bolts between the flanges, 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 necessary and 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 SHOULD BE FLAT BOTTOMED, AND SHOULD BE AT LEAST 1/32" WIDER THAN THE CROSS SECTION OF THE RING EXCEPT WHERE FITTED AS SHOWN IN SKETCH F.{Mr Friese} For high pressure work, the joint ring should be in definite contact with the groove wall on its outer diameter as shown in sketch F.{Mr Friese} DON'T 8 13 | ||