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 The Morgan Crucible Company Limited discussing the design of water pump glands, sealing pressure, and materials.
| Identifier | ExFiles\Box 149a\1\ scan0110 | |
| Date | 30th July 1937 | |
| TT 4109 CODES, A B C 4th 5th & 6th (5 LETTER) EDITIONS, A.I. LIEBERS & WESTERN UNION (UNIV. & 5 LETTER EDIT.) & BENTLEYS. Inland Telegraphic Address, "CRUCIBLE, PHONE, LONDON" (2 words only chargeable) Cable Address, "CRUCIBLE, LONDON" Telephone No BATTERSEA 2250. THE MORGAN CRUCIBLE COMPANY LIMITED BATTERSEA WORKS, CHURCH ROAD, LONDON.S.W.11. MORGANITE REGISTERED TRADE MARK REGISTERED TRADE MARK IN REPLY PLEASE REFER TO Z DEPT ZK/DW 30th July, 1937. Handwritten: hold thru / 512 Rolls-Royce Ltd., D E R B Y. Dear Sirs, We have to acknowledge your letter, reference Rm{William Robotham - Chief Engineer}/Std.3/AP, of the 28th July on the subject of Water Pump Glands. We would reply to the points raised in your letter as follows:- 1). There is no advantage in using a conical sealing face in it's true sense. We use on a number of our glands, dependent upon the design, a one degree backing off on the sealing face in order that the carbon ring may make contact with the revolving shoulder on a line contact to facilitate initial sealing. You will realise this is necessary where there may be a number of spiggots and machined parts in between the housing into which the carbon ring is pressed and the shoulder, which is sliding on the shaft (see our Drawing No.100/640). 2). The optimum sealing pressure was 15 lbs. per square inch when we had our last conversation with your Aero section, but this limiting pressure only applied where the design was of the type shown on our Sketch No. 100/640 since, if the pressure exceeded this with the limited size of the spring shown, it was not possible to obtain a total pressure on the spring sufficient to keep the gland closed. Since this time, however, we have developed a gland which has not this limitation (our Sketch No. 100/1197 enclosed). With this type of gland the limiting pressure is approximately 50 lbs. per square inch. 3). We supply such a varying selection of carbon sealing rings at the present time, that we feel we can accommodate any size upon which you may decide. 4). We recommend that you use either the Phosphor Bronze Company's No.7 material with a Brinell of Contd:- | ||