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The gasoline vapour concentration was measured during refuelling different vehicle tank systems. Special emphasis was put on testing whether the normally overrich vapour/air mixture in the tank inlet becomes explosive by intake of air at higher gas recovery rates.

Using filling nozzles which suck up above the lead-free restriction, the vapour concentration below the lead-free restriction does not differ significantly at vapour recovery rates of 100% (normal value) and 150% (increased value). Using filling nozzles sucking up below the lead-free restriction, however, an air intake was determined at a vapour recovery rate of 150%. At a vapour recovery rate of 100% no difference between both types of filling nozzles could be determined.

Independently of this, the appearance of explosive mixtures above the nozzle's suction opening must always be expected. Furthermore explosive fuel/vapour mixtures can be created in the tank inlet tube, if the gas recovery stream does not stop immediately. ly.

Additional information

Authors: VON PIDOLL U, Physikalisch- Technische Bundesanstalt, Braunschweig (DE)
Bibliographic Reference: Report: PTB-ThEx-4 DE (1998) 25pp.
Availability: Available from Physikalisch Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig (DE)
ISBN: ISBN 3-89701-116-6
Record Number: 199811047 / Last updated on: 1998-09-28
Original language: de
Available languages: de
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