Continuous Flow Hot Water - Instantaneous - Instant - Tankless

No matter what you call them, they are great gas hot water systems. 

Actually, all three terms are very descriptive of this increasingly popular style of water heater.

What is a Gas Compliance Certificate, Plate or Badge?

Accordance with Standards & Regulations

Pick a Plumber… Any Plumber?

LPG Not Working: Help for New LPG Users (Nil LPG Experience)

Gas for Cooking: LPG Gas Cylinders for Cooking

Almost everyone wants to be able to cook like a professional chef, with a gas cooktop. 

Now you can!

LPG is Everywhere!

How to Prevent BBQ Gas Fires

There has been a bit of news recently regarding BBQ gas fires. 

So, it’s worth taking the time to review BBQ safety.

The media is fond of reporting “exploding gas cylinders”.  

The reality is that LPG gas cylinders rarely explode. 

In fact, it would be quite difficult to make one explode.

 The 25th World LPG Forum

Elgas tries to stay on the leading edge of LPG technology and trends. So, it was with great pleasure that we attended the 25th World LP Gas Forum, recently concluded in Bali, Indonesia. The Forum was organized by the World LP Gas Association.

The event was a great success, with a variety of key industry events and topics. Participants came from 70 countries, totalling over 1400 attendees. It included 80 exhibitors from around the world, showing the latest in LPG technology.

LPG vs Propane - Is Propane the Same as LPG | LPG Propane

Essentially, LPG and propane are the same thing. Liquefied Petroleum Gas (liquid petroleum gas) - LPG or LP gas - is also described as just propane or butane. LPG are flammable hydrocarbon gases used in BBQ gas bottles and as fuel for gas heating, gas hot water, cooking gas cylinder and LPG cars.

Propane (C₃H₈) and Butane (C₄H₁₀) and Isobutane (C₄H₁₀) have similar or identical formulae and are flammable hydrocarbon gases categorised as Liquid Petroleum Gas – LPG.  Whilst LPG is either propane, butane or a mixture of the two, they are different chemicals. Autogas is either propane or a propane and butane mix.

Liquefied petroleum gas (LPG or LP gas) is also referred to by its constituent names - propane or butane. In addition to propane, LPG can be butane, isobutane or any of a number of different gases.

In Australia, LPG goes by a number of names including LPG, LPG gas, bottled gas, Propane, BBQ gas, camping gas and LP gas, so it can be quite confusing.

However, it’s all the same gas.

LPG are hydrocarbon fuel gases used for heating, cooking, hot water and vehicles.

Many of the gas appliances sold in Australia are manufactured overseas and call for propane vs LPG. So, you get it home, open the box, and it says that the appliance is made for use with propane vs LPG. Is propane the same as LPG?

But where do you buy Propane in Australia? 

What Size LPG Tank Do I Need and How Many Gas Bottles

The size LPG tank most people need is the standard size LPG tank for homes, a 45kg LPG gas bottle, typically used in pairs. A 45kg is the size the majority of people need because they can be either refilled via an LPG tanker or exchanged with another depot filled bottle.

Two gas bottles allow you to use up all of the gas in the first bottle whilst having time to get a refill or an exchange replacement, as you use the second gas bottle.

The primary criteria for selecting the size and quantity of gas bottles installed should be the service considerations and vaporisation rate requirement.

Or, in other words, you never want to run out of gas and you want the gas bottles to supply gas at the rate required by the appliances.

Two LPG Delivery Choices

The size LPG tank you need is typically the standard size 45kg LPG tank for homes, normally used in pairs. A 45kg LPG tank size is preferred because they can be either refilled via an LPG tanker or exchanged for another full bottle.

With gas bottle exchange, your empty gas bottles are exchanged for full ones by the delivery driver. 

With automatic tanker delivery, the gas bottles stay in place and an LPG tanker comes to your home to refill your gas bottles in place.

Gas Bottle Exchange Service

With an exchange service, you typically get two 45kg gas bottles. 

The 45kg size is used because they can be moved around by the delivery driver without any special lifting equipment. 

Never Run Out of Gas

The concept is that you call for a delivery when one gas bottle is empty, while you continue with an uninterrupted supply from the other gas bottle. 

You should never run out of gas, as long as you remember to order when the first bottle becomes empty.

Automatic Tanker Refilling

With tanker refill, you may have two 45kg gas bottles, one or two 90kg gas bottles or an even larger vessel, if you use a lot of gas. 

The size can be as large as required, because it does not have to be moved. 

Another advantage of tanker refill is that the deliveries are often automatically scheduled by the supplier. 

This means you don’t have to check gas bottles or even order gas. It’s all done for you.

There is one limitation with tanker refilling, in that the driver must have a clear line-of-sight between the gas bottles and the tanker.  

If that is not possible, then you will need to go with the exchange service.

Vaporisation Must Match Consumption - LPG Tank Size

The amount of gas that the appliance or appliances are drawing from the gas bottles must be matched by the rate of vaporisation and this affects the size of the LPG tank or vessel you need.

If a gas bottle ices up regularly, it simply means that the vessel is too small for the vaporisation load placed on it. 

Switching to a larger vessel can provide a higher rate of vaporisation.

Heat is absorbed through the vessel shell and into the liquid.

This is known as the “wetted area”.

The larger the tank or the fuller the tank, the more gas that can be vaporised at a given temperature.

Vaporisation tables (as shown below) are used to match the required vaporisation rates to the corresponding vessel size.

Vaporisation tables show the maximum continuous vaporisation rates, in MJ/hr, at different ambient temperatures for each available vessel size.

In instances where a larger vessel is not an option, the only alternative is to supply some artificial means of increasing vaporisation.

The units used are very appropriately call vapourisers.

LPG (Propane) Vaporisation Table

Vaporisation Table Notes:

1. As a simple rule of thumb, when using vessels of say 2.75 or 5.1kL capacities, simply extrapolate between the two nearest size vessels but biasing your calculations on the conservative side. Always consult your supplier’s technical representative for advice.

2. Always check with your supplier’s technical representative that the above vapourisation rates are correct for the particular vessel you have designated.

3. For sites requiring a high vapourisation rate but it is not cost effective to install larger and/or multiple vessels, consider using a vapouriser.

4. Vessels above 3 tonnes or over 7.5kL will be custom designed by supplier to suit customer needs. Figures provided are only rough estimates, based on previous designs.

Final Thoughts

It’s not so much about size, but how you fill them. 

Combined with the number and type of LPG appliances you have, this will help determine the size and number of gas bottles you need for your home.

View More LPG Gas Blogs

Comments, questions or feedback?

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The information in this article is derived from various sources and is believed to be correct at the time of publication. However, the information may not be error free and may not be applicable in all circumstances.

Welcome to the Elgas LPG Gas Blog

A blog at Elgas?  Who'd have thought?!

Why Have a Blog?

So, why did we decide to start blogging?

Well, we noticed that there is a distinct lack of information being shared on the web when it comes to LPG gas and its related topics.