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What is Bottled Gas

Bottled gas is a name used for chemicals which are in a gaseous state at standard temperature and pressure (STP) and stored under pressure in steel, galvanised steel, aluminium, or composite gas bottles or other vessels.

Bottled gas is a flammable hydrocarbon gas liquefied through pressurisation and stored in gas bottles or gas cylinders. LPG is also called bottled gas, along with propane, butane and mixtures of these gases. Bottled gas comes from natural gas processing and oil refining.

Bottled gas refers to a gas that can be compressed as a gas or liquefied under pressure within a gas bottle of other vessel, typically made of steel, aluminum, stainless steel or composites. These gases are all gaseous at STP - which is 0°C (32°F) at 1atm (100 kPa or 1 bar) - when released from the gas bottle.

In some countries, bottled gas can also refer to butane or propane/butane mixtures of gas.

Is LPG Bottled Gas

LPG is bottled gas. “Bottled gas” is typically a synonym for “LPG” or “propane” stored in gas bottles or gas cylinders. Whilst there are actually many types of gas that come in bottles or cylinders, including industrial and welding gases, it is generally understood to that LPG is bottled gas – LPG (propane) in gas bottles.

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Is LPG (Propane) a Fossil Fuel?

Is LPG-Propane Renewable Energy Source?

"Yes"… LPG is a low-carbon fossil fuel. And, YES, we now know how to make propane renewable energy.

LPG comes from drilling oil and gas wells.

It is a fossil fuel that does not occur in isolation.

LPG is found naturally in combination with other hydrocarbons, typically crude oil and natural gas.

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How LPG Gas Cylinder-Bottle Works - How Does a Propane Tank Work

The pressure in a gas cylinder is too high for most applications, at up to 2482 kPa. Gas regulators are connected to gas cylinder outlet valves to reduce the LPG-propane gas cylinder pressure to the much lower 2.75 kPa working pressure.

A gas cylinder works with pressure that is usually far in excess of what is required as the working pressure. There are specific gas regulators, by gas type, that are used to reduce the cylinder pressure down to the working pressure needed.

LPG is under pressure, as a liquid, and turns back into gas when you release some pressure. Gas cylinder pressure is too high and erratic to use, as temperature variation affects pressure. Gas cylinders require a gas regulator to reduce gas bottle pressure and provide a consistent working pressure.

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Can LPG be Used in CNG Cars?

CNG - compressed natural gas storage cylinders have a tare weight approximately 3x heavier than comparable capacity LPG cylinders. LPG can be compressed into a liquid, increasing its energy density. The biggest difference between CNG and LPG cars is the fuel itself. CNG is methane and LPG is propane and/or butane.

CNG is compressed natural gas – methane.

LPG is liquefied petroleum gas – propane.

There are many similarities between LPG and CNG, as well as some major differences.

They are not interchangeable as automobile fuel…

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How Does LPG Work? Does LPG Work

LPG is called liquefied gas because it is easily transformed into a liquid. LPG needs only low pressure or refrigeration to change it into liquid from its gaseous state. As a gas, LPG expands to 270 times its volume as a liquid. This makes the liquid the ideal way to store and transport LPG.

LPG works as a fuel, providing energy.  It works by generating heat for cooking, heating, hot water and as a fuel for vehicles.

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Is Butane Heavier than Air - Is Butane Lighter than Air - Is LPG Lighter than Air

Butane is 2.006 times heavier than air, under the same temperature and pressure conditions. Butane has a molar mass of 58.124 g/mol vs 28.97 g/mol for air. So, butane is slightly more than twice the weight of air.

Butane gas relative density is heavier than air. Butane relative density is not lighter than air. Butane weighs 2.5436 kg/m³ whilst air weighs 1.225 kg/m³ (with both 15°C at 1 atm), so slightly more than twice the weight.

LPG (propane gas) is not lighter than air. In fact, LPG is over 50% heavier than air at sea level (1 atm). LPG density (propane density) is 1.55 times heavier than air.

So, LPG (propane) is heavier than air.

As a result, LPG gas, both propane and butane, will settle in low places.

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Is it Safe to Use an LPG Cylinder that's Exposed to Fire?

Occasionally people experience a BBQ fire as the result of a faulty cylinder, regulator or hose.

This is one reason why you should always leak test your BBQ connection after replacing gas bottles.

However, fires can happen and the gas bottle may be exposed to the flames.

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LPG Pressure - How Much Pressure in LPG Cylinder - LPG Pressure Relief Valve - Gas Cylinder Pressure

The LPG cylinder pressure in bar goes from 0 bar at -43ºC to 24.8 bar at 70ºC. Most pressure relief valves are set at around 25 bar, so that is about as high as LPG cylinder pressure will go. LPG pressure and how much pressure in LPG cylinder is dependent upon temperature. The pressure of LPG (propane) goes from 0 bar at -43ºC to 152 kPa (24 PSIG or 1.5 bar) at 0ºC to 2482 kPa (360 PSIG or 24.8 bar) at 70ºC. The LPG – propane – exists as both liquid and vapour (gas) within the cylinder.

The LPG gas pressure at which liquid LPG turns to gas is the vapour pressure. This varies based on temperature and the propane - butane mix. The pressure of LPG (propane) goes from 0 bar at -43ºC to 152 kPa (24 PSIG or 1.5 bar) at 0ºC to 2482 kPa (360 PSIG or 24.8 bar) at 70ºC.

The higher the temperature, the higher the pressure of the LPG within the cylinder.

LPG gas cylinder-bottle pressure all depends on the temperature. At 100°F, a 20lb propane tank has 172 PSIG of pressure. pressure is in a 100 lb propane tank would also be 172 PSIG, as the size of the propane tank doesn't matter, only the temperature.

Similarly, a 9kg gas bottle has 1183kPa at 38°C.

LPG cylinder pressure in bar goes from 0 bar at -43ºC to 24.8 bar at 70ºC. The higher the temperature, the higher the LPG pressure or LPG gas cylinder pressure. The LPG pressure relief valve is a safety device that prevents excessive pressure in LPG cylinder by releasing some of the gas if the LPG pressure gets too high.

First, some background regarding how much LPG pressure and LPG gas cylinder pressure (LPG gas bottle pressure):

•  LPG gas bottle pressure or larger vessel pressure, is dependent upon the temperature of the vessel.

•  The LPG – propane – exists as both liquid and vapour (gas) within the cylinder and is also referred to as natural gas liquids – NGL.

•  The term “pressure” refers to the average force per unit of area that the gas exerts on the inside walls of the LPG gas cylinder.

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What Does LPG Stand For? - Meaning of LPG

What Does LPG Stand For?  Liquefied Petroleum GasLPG is a fuel type category consisting of flammable hydrocarbon gases in liquid form when under pressure. LPG is the acronym abbreviation for 'liquefied petroleum gas' or ‘liquid petroleum gas’.

Liquefied Petroleum Gas is a low carbon fuel used for heating, cooking, vehicle fuel, industrial and agricultural applications.

LPG is produced during natural gas processing and petroleum refining and stored as a liquid, under pressure, meaning in gas cylinders or tanks.

Liquefied Petroleum Gas is the preferred meaning within the industry, as it signifies the need to take action for the gas to become a liquid.

But LPG also stands for many other terms...

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Natural Gas Liquids - NGL

NGL – natural gas liquids – include pentanes, isobutane, butane, propane and ethane, all of which are composed of molecules comprised of carbon and hydrogen atoms. These are hydrocarbons similar to natural gas and crude oil. The uses of natural gas liquids (natural gas condensate) are in the thousands.

NGL – natural gas liquids – and condensate are synonymous terms for the liquid hydrocarbons separated from natural gas during processing. They include ethane, propane, butane and pentanes. NGL all turn into liquid when under pressure but are gaseous at NTP. NGL is also sourced from crude oil refining.

NGL production processing starts with raw natural gas, from which the natural gas liquids must be separated. NGL fractionation is used to separate Natural Gas Liquids from natural gas utilising refrigeration. Liquid fractionation columns or towers are used to isolate the NGLs processed from the methane, in the NGL fractionation process.

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