Dibo JMB-MG Mode D'emploi page 120

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I N T R O C N G I N S TA L L AT I O N
Intro CNG installation
GENERAL
The machine is suitable to work with CNG gas. The gas tanks are protected and
mounted on a support. The gas is non toxic and lighter than air BUT does not
contain free oxygen. The combustion of 1 m
of air.
Please watch out for possible risk of suffocation!
Additionally, the ignition temperature is higher than gasoline and diesel. The
tank is equipped by means of a safety valve which will open when needed
and release the abnormally high-pressure gas. This valve ensures that the
tank cannot explode. CNG as a fuel is more environmentally friendly than
conventional fuels. The lower limit of natural gas is 5%, the upper limit is 15%.
L-GAS AND H-GAS
There are two qualities of CNG gasses, just as there are two qualities of natural
gas, namely high-calorific gas (called H-gas - mostly used in Europe) and low-
calorific gas (called L-gas). The CNG- machines can operate on both H-gas and
L-gas. The natural gas consists primarily of methane (CH4), typically 85 % to
97 %. Other elements, present in varying amounts, such as nitrogen, carbon
dioxide, water vapor and hydrogen sulfide, affect the quality and calorific value
of the gas. There is a substantial difference in the quality of the two types of gas:
the calorific value of the gas is clearly lower (lower energy value - less methane)
for L-gas than for H-gas (higher energy value -more methane).
We, DiBO BV, set the burner of the machine at the factory to the
fixed setting: +- 8.5 mBar. If there's another setting/adjustment
required to ensure optimal operation according to the type of gas
used, than this must be done by a certified, qualified installer.
Note: The pressure of natural gas increases as the temperature rises!
EXPLOSION PREVENTION
Explosion hazards may occur in any business where flammable substances are
used. Safety is therefore of prime importance in explosion protection,
as explosions can jeopardise the lives and health of employees due to their
uncontrolled consequences. Therefore, organisational measures must be taken
at the work site to prevent explosions.
Always check the relevant locally applicable regulations
DiBO 14
3 of natural gas requires about 10 m
safety and health) for explosion prevention !
3