Frits Metz
New Member
- Joined
- Nov 23, 2010
- Messages
- 21
Interesting discussion here.
Perhaps I've missed it here, but does anybody know what the designed fuel tank pressure is? That means the strength of the spring in the check valve on the emission line?
Has anybody toiled (tampered) with this spring to reduce the tank pressure?
There are some notions mentioned briefly but not quantified, for instance:
- when taking cold fuel from underground storage at say 16°C, and allowing it to "climatise" to say 28°C, how much vapour is likely to be vented off from say a full tank?
- Understanding the flashpoint of petrol to be -43°C and the boiling point being +95°C, how are these increased by an increased tank pressure?
- What is the change in latent heat of evaporation for the changing fuel tank pressures, particularly in view of a sudden drop in pressure (when the filler cap is removed), resulting in a certain amount of superheat in the flashed fuel? Does anybody here have a Mollier Diagram for Petrol?
Then of course we can start evaluating the effects of blocked emission vents (check valves). How much pressure can we tolerate on a tank. After all, there is no certified relief valve on the system ...
How much thought has gone into thermal insulation of Petrol Tanks (Diesel tanks don't have such a big problem)?
Perhaps I've missed it here, but does anybody know what the designed fuel tank pressure is? That means the strength of the spring in the check valve on the emission line?
Has anybody toiled (tampered) with this spring to reduce the tank pressure?
There are some notions mentioned briefly but not quantified, for instance:
- when taking cold fuel from underground storage at say 16°C, and allowing it to "climatise" to say 28°C, how much vapour is likely to be vented off from say a full tank?
- Understanding the flashpoint of petrol to be -43°C and the boiling point being +95°C, how are these increased by an increased tank pressure?
- What is the change in latent heat of evaporation for the changing fuel tank pressures, particularly in view of a sudden drop in pressure (when the filler cap is removed), resulting in a certain amount of superheat in the flashed fuel? Does anybody here have a Mollier Diagram for Petrol?
Then of course we can start evaluating the effects of blocked emission vents (check valves). How much pressure can we tolerate on a tank. After all, there is no certified relief valve on the system ...
How much thought has gone into thermal insulation of Petrol Tanks (Diesel tanks don't have such a big problem)?