LPG Natural Vaporization rate from a 450 Kg tank ? 1

[Masud15]

Dear Experts,

We are going to install a 450 Kg (846 Liter) LPG storage Tank in our apartment. Its a 7 storied Building having 28 nos. of residential Flats. Each flat use double burner cooking stove. We are going to construct a piping network using required valves, regulators, gauges, etc. to supply the gases to each flat with individual meter.

I'm not a Mechanical engineer and have little knowledge about the reticulated system.

Usually the household cylinders vaporize the gas naturally by utilizing ambient temperature and the natural vaporization has its own limit. In our case, we are going to use a 450 Kg tank for 28 nos. of flats and as per my understanding, natural vaporization of our tank (Inner diameter=1 meter) would not be enough to supply the gases to all 28 flats simultaneously. My questions is:

1) Do we need to use extra vaporizer with the tank ? If yes, how to select a cost effective solution ? What would be the ratings of the vaporizer ?

2) If we don't use extra vaporizer, In how many flats we can supply the gas depending on natural vaporization of 450 kg tank ? ( Our LPG is 30 % Propane and 70% Butane) considering the ambient temperature 30 to 35 degree centigrade.

Please provide the calculations if there any for my 2nd question.

Thanks in advance.

 

[LittleInch]

Masud,

Your ambient temperature you need to consider is the lowest practical winter night time. 30-35C is not that temperature.

This is a service and users will not like on a cold winters night not to be able to cook hot food.

So at that sort of volume flow ( you will need to know how much a double burner uses) and then apply some sort of factor, probably 0.7 , to allow for not all burners to be used at the same time, but realistically a lot will be used in the evening time.

The issue is worst at low levels of liquid in the tank as this then has the lowest square area of tank to provide heat into the LPG.

There are many guides available on line as to the different types of vapourisers ,e.g.

https://algas-sdi.com/why-use-a-vaporizer/

or

https://www.transtechenergy.com/lpg-ngl-storage-news/a-guide-to-lpg/propane-vaporizers

these guys even have a guide.

You really need to be asking your LPG supplier these questions, but especially if this is Butane rich LPG, you will need a vapouriser, just depends whether you keep the LPG at a certain temperature or feed the liquid LPG into a separate vapouriser which can then be electric or fed by LPG burners.

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