As suppliers of both fuels we are often asked for
impartial advice on which fuel is the better, LNG or CNG. Our reply is a
measured one. We believe it important to understand the physical properties of
each fuel. When this is understood you can understand the pros and cons
of each fuel.
LNG has more than 2.4 times
the energy density of CNG at 200 bar, i.e. 435 kg/m3 compared to 175 Kg/m3.
This means that for a given capacity fuel tank, LNG powered vehicles can travel
up to 2.4 times the distance of its CNG counterpart. Or, that for a given
vehicle range, LNG powered vehicles need up to 2.4 times less fuel tank
capacity than its CNG counterpart. This means that LNG vehicle fuel tanks can
be packaged on 6x2 tractor units, whereas CNG cylinders cannot.
offers better value for your money ...
LNG powered vehicles weigh
less than CNG powered vehicles, and therefore can carry up ¾ of a tonne
more cargo/ payload.
LNG powered vehicles cost less to manufacture than
CNG powered vehicles.
A kg of LNG has more energy than a kg of CNG.
LNG refuelling stations need no electricity whereas CNG typically
requires 5p/kg of electricity cost to compress the gas.
cost of LNG refuelling stations, are a fraction of their CNG counterparts.
The maintenance cost of LNG refuelling stations, are a fraction of CNG
Benefits of LNG refuelling infrastructure
Fleet operators are at liberty with LNG stations, to dispense
both LNG and CNG for a fraction of the cost of an equivalent throughput CNG
station which are of course constrained to dispense only CNG.
operators are at liberty to procure 6x2 tractor units powered by LNG but are
constrained too only 4x2 tractors for those powered by CNG.
tractor units are liberated to roam almost anywhere in the UK due to the
growing network of retail outlets, whereas CNG vehicles are still constrained
to depot based operations.
LNG is well on the way to liberating the
whole heavy duty fleet market, including small fleet operators, whereas CNG
remains exclusive to only the biggest of fleets.
LNG is portable, so is
liberated from the pipes to build stations anywhere in the UK, whereas CNG
stations are constrained to areas supplied by pipelines.
Liquefied Compressed Natural Gas
CNG produced from LNG, offers
hauliers both flexibility and value for money:
Maintainance costs are
perhaps only 20% that of dedicated CNG stations
The electrical cost of
compression is perhaps 10% that of CNG stations
The fuel has a
consistent quality and higher calorific value
Fast fill is the norm for
More choice as LCNG station's have the ability to supply
both CNG & LNG LCNG being delivered as LNG bypasses expensive gas pipeline