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).
Testing a centrally vented petrol tank and dashboard gauge unit under pressure.
| Identifier | WestWitteringFiles\U\August1930-November1930\ Scan004 | |
| Date | 4th August 1930 | |
| HS{Lord Ernest Hives - Chair}/SM/AM4.8.30 contd. -2- line to one of our dashboard units. A pressure of 6 lbs/sq.in. was then introduced on to the petrol in the tank and the pressure maintained at that figure. The tank vent and the bell vent were allowed to continue to discharge petrol under this pressure. The reading on the gauge scale did not increase more than 10% of the total range of the scale under these conditions. This test proves that with a centrally vented tank it is possible to produce a tank unit that does not require a second balance line to ensure that the dash unit is not blown when pressure is put on the filler cap of the tank. As we previously pointed out we did not believe that this would be possible but the present results show that we were mistaken. It will be noted that this result was achieved with one of our standard dashboard units. The fact of having only one line connection between the tank unit and the dashboard reduces the chance of a wet air line or loose connection by at least 50%, and this is the trouble which at the present moment is causing us most apprehension. We do not see any reason why we should not be able to do away with the hand pump with this tank unit as it delivers fresh air to the bell and additionally | ||