lebesset
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for the same reason that every company in the world who sells these gases in bottles does
for the same reason that every company in the world who sells these gases in bottles does
for the same reason that every company in the world who sells these gases in bottles does
propane is a gas at ambient temperatures ; pressure liquifies it
because of the higher pressure to which you correctly refer , you need to leave extra volume for the gas to liquify into in case of a rise in temperature , without the pressure increasing or liquid rising to the point where it could go 'up the spout '
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Liquid LPG evaporates to produce about 250 times its volume of gas. ... pressure increases rapidly with temperature. (See vapour pressure chart). ...
www.speedfuels.com/Link.aspx?Mkey=NTI=&lKey=Mg==
3. Co-efficient of Expansion of Liquid
Co-efficient of expansion of liquid LPG is approximately 12 times that of water. This
property in conjunction with liquid density should be taken into consideration for arriving at
safe filling capacities of containers.
Liquid LPG evaporates to produce about 250 times its volume of gas.
1. Liquid Density
LPG in the liquid state is nearly half as heavy as water. Specific gravity ranges from 0.55 –
0.58. Knowledge of this property helps us in calculating the safe quantities that can be filled
in a given container whose volume is known. An LPG container should be filled in such a
way that there will be a 5% ullage left at the design temperature, otherwise, as temperature
rises excessive pressures are likely to be encountered leading to bursting of cylinders.
2. Vapour Specific Gravity
LPG vapour is nearly 1 ½ to 2 times as heavy as air. This would mean that any escaping
vapours of LPG would tend to settle down. Hence, there should be adequate ground level
ventilation where LPG cylinders are stored.
4. Vapour Pressure
This is the most important property of LPG. The vapour of LPG in equilibrium with its liquid
exerts a pressure called the vapour pressure and the magnitude of this pressure is
dependent on the ambient temperature and not on the quantity of the contents. Vapour
pressure increases rapidly with temperature. (See vapour pressure chart). Boiling point of a liquid is that temperature at which the vapour pressure of the liquid equals atmospheric pressure. Since boiling point of LPG is below 0°C the pressure inside a cylinder is always higher than the atmospheric pressure for temperatures above °C and hence, this is the reason that gas gushes out of a cylinder when the valve is opened.
From this it naturally follows that LPG cannot be withdrawn in the vapour state from cylinders when the temperature outside is below its boiling point.
Since, as already mentioned, the vapour pressure is dependent on the temperature and not on the quantity of the contents two points emerge from this property of LPG.
a) As external equipment i.e. a pressure regulator is needed for obtaining gas at a constant pressure for use in appliances irrespective of the ambient temperature.
b) Fitment of a pressure gauge to a cylinder cannot indicate the quantity of gas contained unlike in the case of oxygen or other gas cylinders where the gas is contained in the gaseous state and the pressure inside is gaseous pressure.
Was it Stanley Mathews, I'm not a football fan so he's the only footballer I know...or have heard of, apart from Stanley Baldwin?Who was that footballer every one was talking about yesterday......
stanley mathews or do you mean bernard mathews he's just died:dance:
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LPG in the liquid state is nearly half as heavy as water. Specific gravity ranges from 0.55 – 0.58............
I haven't read this thread - Sorry.
But has everybody seen the new SafeFill bottle?
Home | Safefill
We have had some in for customers - very impressive.