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Difference Between Automotive LPG and Domestic LPG: Composition and Usage

cammora 62102 25
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Czym różni się gaz samochodowy od gazu używanego w domowej instalacji?

Jeśli przez gaz domowy masz na myśli gaz z sieci, to nie jest on tym samym co LPG do aut: gaz ziemny (GZ-50, metan) jest dostarczany gazociągiem, ma postać gazową i wartość opałową ok. 9,97 kWh/m3, a LPG to propan-butan, zwykle produkt przerobu ropy, przechowywany jako ciecz i mający ok. 7,03 kWh/dm3 [#1096975][#1097013] Do jazdy na gaz ziemny stosuje się instalacje CNG, a nie zwykłe LPG, bo potrzebne są inne dysze/reduktor i duże zbiorniki pod wysokim ciśnieniem [#14892827][#14892812] Takie auta są możliwe, ale mają mały zasięg i mało stacji tankowania [#14892827] Jeśli natomiast chodzi o gaz z butli domowej, to bywa on po prostu tym samym LPG, które zasila także auta i wózki widłowe [#1096939][#1096947]
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  • #1 1096849
    cammora
    Level 11  
    Posts: 65
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    Hello
    I have a question (maybe not too much for this forum, but ...) what is the difference between gas for cars and the one in the home installation?
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  • #2 1096862
    mkos1
    Level 30  
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    Unless I am mistaken, it is the calorific value and, of course, the pressure at which it is delivered.
  • #3 1096881
    cammora
    Level 11  
    Posts: 65
    Rate: 32
    So car gas is suitable for home and vice versa? And has anyone tried to ride a wogula?
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  • #4 1096939
    lewy_lowicz
    Level 13  
    Posts: 31
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    The theory is the theory, but in practice in the cylinder at home and in the cylinder in the car is the same LPG. In our company, forklifts run on ordinary domestic cylinders.
    Once, I saw gentlemen driving beetles on these cylinders, who would bring gas home.
  • #5 1096947
    mkos1
    Level 30  
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    cammora wrote:
    So, car gas is suitable for home and vice versa? Has anyone tried to ride a wogula?


    Wait a minute - do you mean "domestic" natural gas or gas from a cylinder?

    Because if it is from a cylinder, it is often the same.
  • #6 1096952
    cammora
    Level 11  
    Posts: 65
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    I mean natural gas
  • #7 1096975
    DAREK M
    Level 13  
    Posts: 109
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    Natural gas is extracted, as the name says, from the ground, and LPG, i.e. propane-butane, is a by-product of crude oil refining, besides, natural gas is gaseous and LPG is liquid. Certainly, experts will give you many other differences, but to power cars, you use mainly LPG, and the natural gas is used sporadically for city buses and sometimes for forklifts.
  • #8 1097007
    cammora
    Level 11  
    Posts: 65
    Rate: 32
    that is, while driving rather nothing, I was just wondering why you can't hear that people do not refuel at home, after all, a Pole can do it.
  • #9 1097013
    Anonymous
    Anonymous  
  • #10 1097053
    cammora
    Level 11  
    Posts: 65
    Rate: 32
    It was precisely this difference that I meant to explain. I wondered if it was possible to drive on natural gas. Thanks to everyone for the explanation
  • #11 1097074
    DAREK M
    Level 13  
    Posts: 109
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    It is possible to drive as I wrote, but there are other installations for natural gas. When it comes to refueling at home, I know a guy who made an extra charge and refueled his car with gas from a kitchen cylinder - he costs about PLN 1.3 per liter instead of PLN 1.9
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  • #12 1097087
    cammora
    Level 11  
    Posts: 65
    Rate: 32
    that is, savings can be made.
    But when it is poured from a cylinder, you need a pump for that?
  • #13 1097108
    DAREK M
    Level 13  
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    How exactly he did it, he did not reveal to me, but I will also ask.
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  • #14 1097214
    mkos1
    Level 30  
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    cammora wrote:
    that is, savings can be made.
    But when it is poured from a cylinder, you need a pump for that?

    It is difficult to transfer the gas without using the pump because it will overflow only until the pressure in both is equalized.
    Some people transfer gas from a cylinder to a cylinder using ... an electric stove :!: They heat the cylinder from which it is to be poured, and due to the greater pressure difference, more can be poured over.
    I haven't seen it in person, but ... I wouldn't really like to be there - I'd like to live a bit more ;)
  • #15 1097239
    cammora
    Level 11  
    Posts: 65
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    Well, this is where the steps begin: pump, hose, cylinder and risk
  • #16 1097484
    panklex
    Level 12  
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    Hello, this is my first statement on this forum, but to the point I saw cars with CNG installation for compressed natural gas and they differ from LPG with a cylinder with pipes and a reducer, the biggest problem is with refueling to pressurize as much gas as possible into the cylinder, in some regions of Poland in gas pipelines there is so much pressure that you can go directly from them in Małopolska, unfortunately not. when refueling home gas installations, fuel costs are greatly reduced.The downside is a large complication, small range and no stations.
  • #17 1097499
    cammora
    Level 11  
    Posts: 65
    Rate: 32
    And what is the difference, e.g. a bottle, is different? Such an ordinary home? Refueling would not be a problem if the price was much lower (and what is the price of 1m of natural gas), you can find a compressor unit. Interesting how combustion?
  • #18 1097525
    DAREK M
    Level 13  
    Posts: 109
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    As far as I know, in city buses, natural gas cylinders take up almost the entire luggage space, when I read about the car, it was probably a Citroen Berlingo, the gas cylinder took up the entire trunk - the car probably belonged to the gas company in Warsaw.
  • #19 1097543
    cammora
    Level 11  
    Posts: 65
    Rate: 32
    So in passenger cars it would pass the exam at short distances, e.g. when driving around a city where the car burns the most anyway, what the trip is refueling. On the other hand, I wonder how much he would smoke per 100km?
  • #20 1097709
    Anonymous
    Anonymous  
  • #21 1097727
    DAREK M
    Level 13  
    Posts: 109
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    this is the only way we deal with compressed natural gas, which requires quite large tanks
  • #22 1099006
    pio1975
    Level 12  
    Posts: 43
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    Hello

    The FIAT company launched the Fiat Multipla on the domestic market with (natural) methane gas, and the car with this engine had lower fuel consumption and more power than an ethyl-fired Fiat.
    Every car with an LPG installation would probably like to run on natural gas
    there is only one problem with compressing this gas into a liquid form.
    Filling the tank with natural gas in the form in which it is in
    home installation for a long ride would not be enough for us
  • #23 1100241
    blackpower
    Level 17  
    Posts: 221
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    A friend who works at MPK told me about test buses for natural gas. In fact, the gas must be liquefied, the bus has huge tanks along the entire length of the roof, the refueling of which takes 4 hours. And the funny thing is that such a vehicle will not run all day on this fuel. He has to refuel again during the day! As a result, fuel consumption is not the lowest, but it probably pays off anyway.
  • #24 14892782
    krisparuszewski
    Level 1  
    Posts: 1
    Personally, I downloaded 3 VV Polo for natural gas from Belgium. They were previously used by the municipal police. Rear seats removed and in their place quite large tanks (100 liters for sure). Of course, these vehicles were converted into gasoline in Poland. Compressors for shifting from the gas network are very expensive and it is not worth doing it alone ... but I know that people with garages in housing estates buy together. The cost of 100 km is said to be around PLN 10. Not counting the investment in the compressor, of course.

    Moderated By tzok:

    I remind - Forum Regulations :
    3.1.19. Do not send messages on archival topics if this is another question, in particular other than the questioning person. Out of respect for the questioner, create your own topic. You can only add a solution to the problem.

  • #25 14892812
    witold04
    Level 18  
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    Natural gas (methane) in an automotive installation is CNG, it is worth reading for such an installation.
    PropaneButane in the LPG installation and the one used at home differs in that the LPG one has a compound similar to oil added to it, I know this because I have refueled a cylinder from a stove at an LPG station more than once and I noticed such an oily substance on the valve.
  • #26 14892827
    tzok
    VIP Meritorious for electroda.pl  
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    Since the topic has been unearthed, I explain:
    - there are gas installations for cars running on CNG gas and there are stops where you can refuel such a car, but there are few of them (https://www.google.pl/search?q=+CNG+ stations in+Polsce " target="_blank" rel="nofollow noopener ugc" class="postlink inline" title="" > https://www.google.pl/search?q=+CNG+ stations in+Polsce ),
    - such installations can be used in passenger cars, but the cylinders are large and take up the entire trunk,
    - combustion is similar (slightly lower) to gasoline, the cost of CNG is similar to LPG, only the price of the installation is higher (about 2x as much as the LPG installation) and you have to travel far to refuel (unless you live near a CNG station),
    - just like in gas cookers or stoves, the nozzles need to be replaced depending on whether they are powered by CNG or LPG, and the LPG car installation is not suitable for use with CNG gas,
    - in the company where I had an internship, they poured LPG from forklifts into the cylinder (they stole) - one lost both hands, and the other had to be scraped off the walls ...

    I think that closes the topic.
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Topic summary

✨ The discussion centers on the differences between LPG (liquefied petroleum gas) used in vehicles and natural gas (methane) used in home installations. Key distinctions include the calorific value, pressure delivery, and physical state—LPG is a liquid while natural gas is gaseous. LPG is primarily a by-product of crude oil refining, whereas natural gas is extracted from the ground. The conversation also touches on the feasibility of using natural gas in vehicles, the challenges of refueling, and the potential for cost savings. It is noted that while LPG can be used in both home and automotive applications, specific installations and modifications are required for natural gas vehicles. Additionally, safety concerns and the complexity of transferring gas from cylinders are highlighted.
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FAQ

TL;DR: Natural GZ-50 gas delivers 9.97 kWh m³, while LPG gives 7.03 kWh dm³; “in practice… the same LPG” powers cars and cookers [Elektroda, #1097013; #1096939]. Why it matters: choosing the right fuel saves money, space and prevents accidents.

Quick Facts

• Calorific value: GZ-50 ≈ 9.97 kWh m³; LPG ≈ 7.03 kWh dm³ [Elektroda, 1097013] • Typical CNG storage pressure: 200–250 bar [CNG-Europe] • Home gas compressor (3–5 Nm³ h) costs €3 000–€5 000 [Gasworld] • Average CNG running cost: ~PLN 10 per 100 km for VW Polo [Elektroda, post #14892782] • Refuelling a CNG bus can take 4 h and still won’t last a full day [Elektroda, 1100241]

What is the chemical difference between automotive LPG and household natural gas?

Automotive LPG is a liquid mix of propane and butane; household natural gas is mainly methane. LPG stays liquid at modest pressure, while methane needs high compression or ‑162 °C liquefaction to stay liquid [Elektroda, DAREK M, post #1096975]

How much energy does each fuel contain?

Natural GZ-50 gas supplies 9.97 kWh per cubic meter, whereas propane-butane LPG provides 7.03 kWh per deciliter of liquid volume [Elektroda, Anonymous, post #1097013]

Can I run my LPG-equipped car on the gas from my kitchen pipe?

No. LPG reducers, injectors and tank pressures are designed for propane-butane. Methane needs CNG hardware rated at ~200 bar and different nozzle sizes [Elektroda, tzok, post #14892827]

What exactly is CNG and how does it compare to LPG?

CNG (Compressed Natural Gas) is methane stored at 200–250 bar. It occupies large, heavy cylinders and gives slightly lower consumption than petrol. LPG stores at 6–10 bar, uses compact tanks, and costs less to install [CNG-Europe; Elektroda, tzok, #14892827].

Why don’t drivers simply refill cars from household LPG cylinders?

Pressure equalises after a few litres. Without a pump, you must heat one cylinder and cool the other—a risky hack that has caused serious injuries [Elektroda, mkos1, post #1097214]

How dangerous is DIY LPG transfer?

One workplace attempt ended with a worker losing both hands and another fatality, after stolen LPG was poured between cylinders [Elektroda, tzok, post #14892827]

What equipment do I need to compress natural gas at home?

A certified 2-stage compressor (≥200 bar), gas dryer, priority panel and explosion-proof enclosure. Units rated 3–5 Nm³ h cost €3 000–€5 000 and need annual servicing [Gasworld].

How big are CNG tanks in cars and buses?

A Citroën Berlingo lost its entire boot to a single cylinder; city buses mount roof-length banks that take most luggage space [Elektroda, DAREK M, #1097525; #1100241].

Is automotive LPG cleaner than the LPG sold for stoves?

Station LPG often contains lubricating oil traces to protect fuel-pump seals. Cylinder LPG lacks this additive, so stove valves stay dry [Elektroda, witold04, post #14892812]

How do I safely decant LPG between two cylinders?

  1. Weigh both cylinders; never exceed 80 % liquid fill.
  2. Connect an approved LPG transfer pump with anti-return valves.
  3. Ground and vent the area, then run the pump until target weight reached; close valves and leak-check with soap solution. Never use heat for pressure.

What happens if I use LPG nozzles with CNG?

The smaller LPG orifice restricts methane flow, causing lean mixtures, misfires and possible valve damage. Pressure mismatch may also rupture lines [Elektroda, tzok, post #14892827]

Can I buy factory-built natural-gas cars?

Yes. Fiat Multipla and VW Caddy EcoFuel come factory-equipped. Fiat’s methane version even showed higher power and lower consumption than its petrol sibling [Elektroda, pio1975, post #1099006]

What storage pressures are typical for CNG cylinders?

Passenger-car CNG cylinders are rated to 200 bar working pressure and tested to 300 bar burst pressure [CNG-Europe].

Edge case: what failures underline strict safety?

A forklift depot illegally siphoned LPG; the improvised setup exploded, killing one worker and maiming another. "I had to be scraped off the walls," an eyewitness noted [Elektroda, tzok, post #14892827]
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