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).
Specifications for fuel colouring, testing methods, and a detailed gum test procedure.
| Identifier | ExFiles\Box 27a\4\ Scan104 | |
| Date | 28th April 1933 guessed | |
| -3- (9) COLOUR. When tetra-ethyl lead is used as an anti-detonant the fuel must be coloured with a suitable blue solvent dye to distinguish the leaded fuel from those not so doped. The required minimum intensity of colour is obtained by the addition of 'X' m.l.s. of tetra ethyl lead per Imperial gallon in the form of blue 1T Ethyl Fluid. (10) METHODS OF TEST. Except where otherwise stated the "Standard Methods of Testing Petroleum and its Products" Second Edition and Addenda as promulgated by the Institution of Petroleum Technologists will be used. (11) SAMPLING. In order to obtain consistency of results on Inspection it is essential that sampling should be carried out in accordance with the details laid down in Appendix 3. APPENDIX I. GUM TESTS - DESCRIPTION. APPARATUS. The apparatus shall consist of the following:- (a) Dish. The dish shall be made of a suitable resistance glass and in shape shall be either hemispherical, 80 to 90 mm. in diameter, or flat bottomed, 80 to 90 mm. in diameter at the top, 45 to 50 mm. in depth, and approximately 45 mm. in diameter at the bottom. (b) Steam Bath. The apertures shall be of such size that the dishes will be immersed to within about 10 mm. of the top. If the evaporation is not carried out in a draught-free chamber, the bath shall be provided with a draught shield. (c) Storage Flask. A 500 ml. measuring flask fitted with a glass stopper, and made of a suitable resistance glass, shall be used. PROCEDURE. Existent gum. 50 ml. of the petrol shall be evaporated in the glass dish on a vigorously-boiling steam bath, the dish having been cleaned previously by soaking in chromic acid solution, and rinsing in distilled water. | ||