Gas Fuel Technology
Find out how we can help you Save over 30% on your fueling fleet in the next 3 years, Read more
Book an Assessment


Cars, Vans, HGVs, Buses, Forklift Trucks – in fact any internal combustion engine vehicle? Our experts can assess and analyse your operation and advise on the best package solution to move you on to an alternative fuel such as Compressed Natural Gas (CNG).

To gain a better understanding of our Services please click here.
A member of NGVA Europe

We have a wealth of knowledge and expertise in the Natural Gas industry.
The answers seen below are brief summaries. If you wish us to elaborate or have other questions Please feel free to contact us.

What is Natural Gas?

Natural Gas is a naturally occurring hydrocarbon formed over millions of years through the decomposition of organic matter.
It is found underground in reservoirs.

Methane is the main component of natural gas and usually makes up about 90% of “pipeline quality” natural gas.
To meet specified requirements the gas is separated and then processed to remove contaminants. Natural gas is odourless so odourants are added to give it the familiar gas smell for safety purposes.  

What are NGVs (Natural Gas Vehicles)?

Natural gas vehicles are either OEM (Original Equipment Manufacturer) models designed to run on natural gas or standard vehicles that have been converted to run on natural gas.There are three types of NGV:

What is CNG?

CNG stands for Compressed Natural Gas and is the term used for methane or natural gas that has been pressurised. normally to 250 or 300 bar.

Natural Gas remains in it’s gaseous state at all times during this pressurisation process.

What are CNG Refuelling Stations?

CNG Refuelling stations are complete installations that allows a vehicle to refuel using compressed natural gas. The station is primarily made up of a gas supply, gas compressor, storage cylinders, priority panel and dispensers.
    The refuelling of buses through a slow fill system
  • Time or Slow fill Stations

    Time fill stations allow a vehicle to refuel overnight.
    These stations would suit the purpose of certain vehicle fleets eg buses.
  • Fast Fill

    CNG Roadsign adopted by the United Nations in September 2005These stations are more common as they offer convenient and fast refuelling. Suitable for mainstream use by the public, taxis, HGVs and buses for example. Any kind of vehicle can be refuelled at these stations.

Are there any CNG Stations in the UK?

There are currently 9000 CNG stations worldwide with approximate growth seeing 1,700 new stations being built on average every year.
We have placed a map on the homepage but there is also a list of filling stations below. If you would like more information you can see maps and directions at NGVA Website.

How long have NGVs been in use?

NGVs have been around for nearly 100 years and to date there are now nearly five million NGV vehicles on the roads.

Why do businesses, countries and governments decide to convert to NGVs?

The reasons for switching to alternative fuels such as CNG, are easy to understand. In brief they usually relate to a combination of the following.

How Safe are NGVs?

Natural Gas and Natural gas vehicles are very safe. Long Term Supply of Natural Gas

Car drop test

Cars dropped from 10, 17, 23 and 30 meters with CNG tanks intact and not leaking.

This is a very visual representation of vehicle safety, however, tests and demonstrations like these simply support the very rigorous testing that CNG has undergone to ensure that it meets international levels of safety. To read more about the standards please go to the next FAQ.

Are there any standards and regulations in use to provide controls within the NGV industry?

International and Regional Standards

There are many countries that have varying degrees of experience in the CNG market and as such have developed a number of separate and different sets of Standards and Codes of Practice relating to the design and installation of CNG refuelling stations. For example, a CNG equipment designed and manufactured in the UK to UK standards may not be suitable for use in Germany and vice
Harmonisation of standards across continents is now progressing, as is a proposed world standard on CNG installations.
The main areas that standards cover are as follows:
a) Vehicles (Fuel system components, connectors, safety, cylinders, installation & testing).
b) Stations (design, installation, testing, commissioning, operation, training).
c) Gas quality.
d) Small refuelling appliances (home-fill type).
Each country may have different standards for each of these sections and therefore you need to understand the content of the standard for the country that you are bidding for. In particular watch out for pressure vessel coding, electrical requirements, power & voltage considerations, gas quality variances, vehicle connector sizes, noise level requirements, foot-print size, storage coding,
dispenser requirements and safety issues.
A typical European (UK) specification would have the following content:
a) CompAir UK Ltd are accredited to ISO 9001 approval for quality control systems
b) Stations are designed to IGE/UP/5 Pt 1 and the latest European harmonised standards
EN1012 draft
c) Equipment supplied will meet machinery directive requirements and carry CE marking
d) Motor spec – Class 1, Division 1, Group D
e) High pressure cylinders – New cylinders to BSEN 1964. Second hand cylinders to ISO9809
f) Dispensers – Suitable for Zone 1, hazardous areas
g) Equipment designed to additional codes including; 98/37/EEC (Machinery Directive), BS EN292 (Safety of machinery), BS EN1012-1 (Compressor safety requirements), 97/23/EC (Pressure Equipment Directive PED), and 94/9/EC (ATEX 100a Directive – classification
group II, Cat 2, Atmosphere G, T2).

Do we have a stable, secure and long lasting supply of natural gas available?

Yes. Ensuring a stable, long term supply was a vital precursor to the large and ongoing investments made by countries and governments worldwide in order to deliver CNG.
Long Term Supply of Natural Gas North America North America South & Central America S. & Cent AmericaEurope EuropeFormer Soviet Union Former Soviet UnionAfrica AfricaMiddle East Middle EastAsia Pasific Asia Pacific

What true environmental benefits exist in using natural gas as a resource as opposed to using gasoline?

Transportation accounts for about 60% of man-made global pollution and, in industrialized countries, about 60% of petroleum consumption. About 99% of the fuels consumed in traditional vehicles are petroleum based, so the linkages between vehicles, petroleum and pollution are clear.

Many people do not know that natural gas as a vehicle fuel can reduce greenhouse gases by 20-25% or more from today’s best-available petrol car technology. Also, particulates can be reduced by as much as 99%; nitrous oxides (NOx) by as much as 85%; and carbon monoxide (CO) by more than 90%.

What is the future outlook and vision for alternative fuels?

It is unlikely that alternative fuels will completely replace petrol and diesel in a world that today has 647 million vehicles with internal combustion engines.

However, for NGVs it is likely that the industry will capture 5% to 10% of the vehicle market by 2010 and a 20% to 25% market share by 2025 is possible.

What about hydrogen fuel for vehicles?

In the second quarter of the 21st century hydrogen fuel cells will become smaller and more economic for vehicle applications.

The question is: where will the hydrogen fuel for zero emission fuel cell vehicles come from?

Natural gas (CH 4) is a economic carrier of hydrogen which can be reformed either on-board the vehicle or at a fuelling station.

With a pipeline infrastructure in place and an expanding CNG fuelling infrastructure being developed for today’s internal combustion NGVs, natural gas presents an excellent opportunity to pave the way towards the ultimate clean fuel vehicles of the 21st century.


UK Gas Distribution
Gas is delivered to the seven reception points by gas producers operating rigs, in about 100 fields beneath the sea around the British Isles.
read more..
Check out the GFT Total Package Solutions.
CNG, Compressed Natural Gas, is the world's fastest growing alternative fuel.
The number of Natural Gas Vehicles is growing at the rate of over 70,000 vehicles per month.

back to top
© 2006 GFT, All Rights Reserved | Contact Us | Terms of Use | Cookies | Site Map | Accessibility | designed by Digital Feet