GASEOUS
FDEL
Gaseous fuels can be used as a fuel for ensnes equipped with special gas-gasoline
carbu-
retion
kits
which are installed at the Factory.
These gaseous fuels may
be
natural or
manufactured gas, or a mixture
of the two, supplied to the customer through regular
gas
mains or liquified petroluem gas
(LP
or LPG) such as butane or propane - these
are
also
referred to as bottle gas since they are delivered in steel tanks under considerable
pressure.
Gaseous fuels are often preferred for permanent installations because of
convenience, safety, cost and cleaner operation.
Engines adapted for burning gaseous fuels are equipped with Model F Ensign Gas Fuel Regulators,
This regulator
is
designed to regulate the proper flow of gas over the entire
load range, from no load to full load on the Generator, and to stop the flow of gas when
the engine
is
stopped,
This
regulator
is
often referred to as the Secondary regulator
because the pressure of the gas from a storage tank or from the high pressure
gas
mains
has already been reduced by a primary regulator.
Gas reaching the secondary regulator
is
usually
at a pressure of four to
six
ounces
per
square inch, (seven to ten inches of water), When the engine
is
not running, that
is
when the pressure at the inlet to the regulator
is
highest, the pressure should not
ex-
ceed six ounces, (with greater pressure the regulator may be unable to stop the flow of
gas
)
,
When the enane Generator
is
running at
full load,
that
is
when the pressure
is
lowest,
it
should not fall below four ounces
-
less pressure may cause the engine to
be
starved for fuel. The engine
will
then lack power and be damaged internally.
Bottled gas, such as propane
is
usually stored in a liquid state in steel
tanks
under
a
pressure in excess of
70
pounds per square inch, Normally, from one-tenth to fifteen-
hundreths gallons of propane fuel
is
required per hour of operation for each horsepower
rating of the engine,
A
primary regulator must be used to reduce the pressure to about
six ounces per square inch,
Natural gas, manufactured gas or a mixture of the two
is
usually delivered at a pressure not exceeding six ounces per square inch, so that no
primary regulator
is
required.
When burning
LP
gas or natural gas having a BTU
content of
1100
or over, the Engine
Generator Plant
will
deliver
its
full rated output,
When burning mixed
gas
(natural
and manufactured) with the rating of
825
BTU,
it
will
deliver up to
80%
of
its
rated
capacity.
When burning manufactured gas of approximately
550
BTU,
it
will
produce up
to of
its
rated capacity.
Natural gas, manufactured gas and bottle gas do not usually ignite
as
readily as gaso-
line. However, since the Generators on remote starting Electric Start Generators crank
the engines at
a
high
rate of speed, no difficulty in starting
is
usually experienced
at normal temperatures.
The use of
LP
bottle gas, however
is
not recommended in freezing
temperatures,
OPERATING
ENGINES
ON
GAS
FUEL
Engines equipped with combination gas-gasoline carburetors
are properly adjusted before
they leave the Factory,
A
tag attached to the
unit
specifies whether the adjustments
were made for gasoline, propane gas
(LPG)
or natural gas.
On
this
tag also will be the
correct pressures for proper operation of
this
unit
with the new type gaseous fuels.
To operate on gasoline:
If the engine
is
equipped with a gasoline tank
it
can be used
in the regular manner,
If the engine does not have a gasolilre
tank
but
is
equipped with