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number of domestic connections was 215 million i e one connection for every six people with a circulation of more than 350 million lpg cylinders 20 most of the lpg requirement is imported piped city gas supply in india is not yet developed on a major scale lpg is subsidised by the indian government for domestic users an increase in lpg prices has been a politically sensitive matter in india as it potentially affects the middle class voting pattern lpg was once a standard cooking fuel in hong kong however the continued expansion of town gas to newer buildings has reduced lpg usage to less than 24 of residential units however other than electric induction or infrared stoves lpg fueled stoves are the only type available in most suburban villages and many public housing estates lpg is the most common cooking fuel in brazilian urban areas being used in virtually all households with the exception of the cities of rio de janeiro and são paulo which have a natural gas pipeline infrastructure since 2001 poor families receive a government grant vale gás used exclusively for the acquisition of lpg since 2003 this grant is part of the government s main social welfare program bolsa família also since 2005 the national oil company petrobras differentiates between lpg destined for cooking and lpg destined for other uses establishing a lower price for the former this is a result of a directive from the brazilian federal government but its discontinuation is currently being debated 21 lpg is commonly used in north america for domestic cooking and outdoor grilling rural heating edit lpg cylinders in india liquefied petroleum gas tank on a rural farm predominantly in europe and rural parts of many countries lpg can provide an alternative to electric heating heating oil or kerosene lpg is most often used in areas that do not have direct access to piped natural gas in the uk about 200 000 households use lpg for heating lpg can be used as a power source for combined heat and power technologies chp chp is the process of generating both electrical power and useful heat from a single fuel source this technology has allowed lpg to be used not just as fuel for heating and cooking but also for decentralized generation of electricity motor fuel edit lpg filling connector on a skoda 120 main article autogas white bordered green diamond symbol used on lpg powered vehicles in china when lpg is used to fuel internal combustion engines it is often referred to as autogas or auto propane in some countries it has been used since the 1940s as a petrol alternative for spark ignition engines in some countries there are additives in the liquid that extend engine life and the ratio of butane to propane is kept quite precise in fuel lpg two recent studies have examined lpg fuel oil fuel mixes and found that smoke emissions and fuel consumption are reduced but hydrocarbon emissions are increased 22 23 the studies were split on co emissions with one finding significant increases 22 and the other finding slight increases at low engine load but a considerable decrease at high engine load 23 its advantage is that it is non toxic non corrosive and free of tetraethyllead or any additives and has a high octane rating 102 108 ron depending on local specifications it burns more cleanly than petrol or fuel oil and is especially free of the particulates present in the latter lpg has a lower energy density per liter than either petrol or fuel oil so the equivalent fuel consumption is higher many governments impose less tax on lpg than on petrol or fuel oil which helps offset the greater consumption of lpg than of petrol or fuel oil however in many european countries this tax break is often compensated by a much higher annual tax on cars using lpg than on cars using petrol or fuel oil propane is the third most widely used motor fuel in the world 2013 estimates are that over 24 9 million vehicles are fueled by propane gas worldwide over 25 million tonnes over 9 billion us gallons are used annually as a vehicle fuel not all automobile engines are suitable for use with lpg as a fuel lpg provides less upper cylinder lubrication than petrol or diesel so lpg fueled engines are more prone to valve wear if they are not suitably modified many modern common rail diesel engines respond well to lpg use as a supplementary fuel this is where lpg is used as fuel as well as diesel systems are now available that integrate with oem engine management systems conversion kits can switch a vehicle dedicated to gasoline to using a dual system in which both gasoline and lpg are used in the same vehicle in 2020 bw lpg successfully retrofitted a very large gas carrier vlgc with lpg propulsion technology pioneering lpg s application in large scale maritime operations 24 lpg s lowers emissions of carbon dioxide sulfur oxides nitrogen oxides and particulate matter 25 26 align with stricter standards set by the international maritime organization imo making lpg a viable transition option as the maritime industry transitions towards net zero carbon emissions 27 conversion to gasoline edit lpg can be converted into alkylate which is a premium gasoline blending stock because it has exceptional anti knock properties and gives clean burning refrigeration edit lpg is instrumental in providing off the grid refrigeration usually by means of a gas absorption refrigerator blended from pure dry propane refrigerant designator r 290 and isobutane r 600a the blend r 290a has negligible ozone depletion potential very low global warming potential and can serve as a functional replacement for r 12 r 22 r 134a and other chlorofluorocarbon or hydrofluorocarbon refrigerants in conventional stationary refrigeration and air conditioning systems 28 such substitution is widely prohibited or discouraged in motor vehicle air conditioning systems on the grounds that using flammable hydrocarbons in systems originally designed to carry non flammable refrigerant presents a significant risk of fire or explosion 29 30 vendors and advocates of hydrocarbon refrigerants argue against such bans on the grounds that there have been very few such incidents relative to the number of vehicle air conditioning systems filled with hydrocarbons 31 32 one particular test conducted by a professor at the university of new south wales unintentionally tested the worst case scenario of a sudden and complete refrigerant expulsion into the passenger compartment followed by subsequent ignition he and several others in the car sustained minor burns to their face ears and hands and several observers received lacerations from the burst glass of the front passenger window no one was seriously injured 33 aerosol propellant edit this section is an excerpt from aerosol spray dispenser aerosol propellants edit chlorofluorocarbons cfcs were once often used as propellants 34 but since the montreal protocol came into force in 1989 they have been replaced in nearly every country due to the negative effects cfcs have on earth s ozone layer the most common replacements of cfcs are mixtures of volatile hydrocarbons typically propane n butane and isobutane 35 dimethyl ether dme and methyl ethyl ether are also used all these have the disadvantage of being flammable nitrous oxide and carbon dioxide are also used as propellants to deliver foodstuffs for example whipped cream and cooking spray medicinal aerosols such as asthma inhalers use hydrofluoroalkanes hfa either hfa 134a 1 1 1 2 tetrafluoroethane or hfa 227 1 1 1 2 3 3 3 heptafluoropropane or combinations of the two more recently liquid hydrofluoroolefin hfo propellants have become more widely adopted in aerosol systems due to their relatively low vapor pressure low global warming potential gwp and nonflammability 36 storage edit bottling lpg in majuro the marshall islands for storage lpg can be stored in a variety of manners lpg as with other fossil fuels can be combined with renewable power sources to provide greater reliability while still achieving some reduction in co 2 emissions however as opposed to wind and solar renewable energy sources lpg can be used as a standalone energy source without the expense of electrical energy storage global production edit global lpg production reached over 292 million metric tons per year mt a in 2015 while global lpg consumption to over 284 mt a 37 62 of lpg is extracted from natural gas while the rest is produced by petroleum refineries from crude oil 38 44 of global consumption is in the domestic sector the u s is the leading producer and exporter of lpg 39 security of supply edit because of the natural gas and the oil refining industry europe is almost self sufficient in lpg europe s security of supply is further safeguarded by a wide range of sources both inside and outside europe a flexible supply chain via water rail and road with numerous routes and entry points into europe according to 2010 12 estimates proven world reserves of natural gas from which most lpg is derived stand at 300 trillion cubic meters 10 600 trillion cubic feet production continues to grow at an average annual rate of 2 2 comparison with natural gas edit this section needs more citations please help improve this section by adding citations to reliable sources unsourced material may be challenged and removed november 2025 learn how and when to remove this message lpg is composed mainly of propane and butane while natural gas is composed of the lighter methane and ethane lpg vaporised and at atmospheric pressure has a higher calorific value 46 mj m 3 equivalent to 12 8 kwh m 3 than natural gas methane 38 mj m 3 equivalent to 10 6 kwh m 3 which means that lpg cannot simply be substituted for natural gas in order to allow the use of the same burner controls and to provide for similar combustion characteristics lpg can be mixed with air to produce a synthetic natural gas sng that can be easily substituted lpg air mixing ratios average 60 40 though this is widely variable based on the gases making up the lpg the method for determining the mixing ratios is by calculating the wobbe index of the mix gases having the same wobbe index are held to be interchangeable 40 lpg based sng is used in emergency backup systems for many public industrial and military installations and many utilities use lpg peak shaving plants in times of high demand to make up shortages in natural gas supplied to their distributions systems lpg sng installations are also used during initial gas system introductions when the distribution infrastructure is in place before gas supplies can be connected developing markets in india and china among others use lpg sng systems to build up customer bases prior to expanding existing natural gas systems lpg based sng or natural gas with localized storage and piping distribution network to the households for catering to each cluster of 5000 domestic consumers can be planned under the initial phase of the city gas network system this would eliminate the last mile lpg cylinders road transport which is a cause of traffic and safety hurdles in indian cities these localized natural gas networks are successfully operating in japan with feasibility to get connected to wider networks in both villages and cities environmental effects edit commercially available lpg is currently derived mainly from fossil fuels burning lpg releases carbon dioxide a greenhouse gas the reaction also produces some carbon monoxide lpg does however release less co 2 per unit of energy than does coal or oil but more than natural gas it emits 81 of the co 2 per kwh produced by oil 70 of that of coal and less than 50 of that emitted by coal generated electricity distributed via the grid 41 being a mix of propane and butane lpg emits less carbon per joule than butane but more carbon per joule than propane lpg burns more cleanly than higher molecular weight hydrocarbons because it releases less particulate matter 42 as it is much less polluting than most traditional solid fuel stoves replacing cookstoves used in developing countries with lpg is one of the key strategies adopted to reduce household air pollution in the developing world 43 fire explosion risk and mitigation edit this section needs more citations please help improve this section by adding citations to reliable sources unsourced material may be challenged and removed september 2009 learn how and when to remove this message lpg horton sphere tanks at a repsol butano facility in gijón spain in a refinery or gas plant lpg must be stored in pressure vessels these containers are either cylindrical and horizontal sometimes referred to as bullet tanks or spherical of the horton sphere type typically these vessels are designed and manufactured according to some code in the united states this code is governed by the american society of mechanical engineers asme lpg containers have pressure relief valves such that when subjected to exterior heating sources they will vent lpgs to the atmosphere or a flare stack if a tank is subjected to a fire of sufficient duration and intensity it can undergo a boiling liquid expanding vapor explosion bleve this is typically a concern for large refineries and petrochemical plants that maintain very large containers in general tanks are designed so that the product will vent faster than pressure can build to dangerous levels one remedy that is utilized in industrial settings is to equip such containers with a measure to provide a fire resistance rating large spherical lpg containers may have up to a 15 cm steel wall thickness they are equipped with an approved pressure relief valve a large fire in the vicinity of the vessel will increase its temperature and pressure the relief valve on the top is designed to vent off excess pressure in order to prevent the rupture of the container itself given a fire of sufficient duration and intensity the pressure being generated by the boiling and expanding gas can exceed the ability of the valve to vent the excess alternatively if due to continued venting the liquid level drops below the area being heated the tank structure can be overheated and subsequently weakened in that area if either occurs the container may rupture violently launching pieces of the vessel at high velocity while the released products can ignite as well potentially causing catastrophic damage to anything nearby including other containers 44 people can be exposed to lpg in the workplace by breathing it in skin contact and eye contact the occupational safety and health administration osha has set the legal limit permissible exposure limit for lpg exposure in the workplace as 1000 ppm 1800 mg m 3 over an 8 hour workday the national institute for occupational safety and health niosh has set a recommended exposure limit rel of 1000 ppm 1800 mg m 3 over an 8 hour workday at levels of 2000 ppm 10 of the lower explosive limit lpg is considered immediately dangerous to life and health due solely to safety considerations 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