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CNG
Refuelling station
M.T.M. S.r.l. – BRC Gas Equipment
A company located in Cherasco (Italy), is among the world leaders
in the field of designing and manufacturing of components and
equipment for CNG and LPG automotive engine conversion.
After a first growth phase mainly connected to the manufacturing of
LPG multivalves, M.T.M. – BRC Gas Equipment has started in the
80s the production of a complete range of LPG and CNG
components; in 1991 was made the first system for carburetion
close loop control and, in 1996 the very first Italian LPG/CNG MPI
injection system. The staff increased progressively up to the present
500 employees working in 4 different factories, under a 40.000 m2
covered area.
In the 2005, M.T.M. – BRC Gas Equipment has finalized a two years
merging process with the American Impco, world leader for the
industrial applications of the gaseous fuels, thus creating the world
biggest manufacturing concentration in the field of the alternative
fuels.
CNG Refuelling station
The standard layout consists of a three stages
reciprocating W compressor and an hydraulic high
pressure unit of compression (BOOSTER)
CNG refuelling station
The compression system is inside a 20” container that is divided in to
3 separate rooms:

1° room in which there aren’t pipes containing gas, and that contains
the electrical panel (with plc), hydraulic power station (for box
handling), and pneumatic panel with air compressor.
CNG refuelling station
 2° room containing compressor, booster, lubrication and cooling
equipment
 3° room containing storage tanks
CNG refuelling station
The compression station consists of the following main parts:

Connection to the feeding net with filter and safety valves (outside
the compressor room)

Three stages reciprocating compressor with crankshaft,
connecting rods, single effect

Medium pressure vessels for damping and storage

Booster compressor (driven by hydraulic cylinder)

High pressure vessels for damping and storage

Control panel to reduce the pressure from the high pressure
storage to the dispenser

Safety valves with pneumatic actuator and filter/condensate
drainage system between storage cylinders and dispenser

Dispenser

Cooling system.
CNG Refuelling station
System management
All control parameters can be set
through PLC. Using the pressure
transducers and a specific software,
it is possible to guarantee an efficient
scheduled maintenance. It’s also
available an optional modem for the
remote control of the station.
BRC Compressors
BRC Compressors are specifically developed for
CNG applications to obtain the maximum safety,
efficiency, reliability and easy maintenance. The
BRC compression systems completely designed
and
industrialized
within
our
Technical
departments, by the use of the most advanced
instruments for safe dimensioning and design.
W Compressors
The shape of BRC compressor allows a good
inertial balancing, keeping small external
dimensions, an easy disassembling of the
components and an excellent reliability of the
whole system.
W Compressors
Innovative technical solutions
A particular care has been used for the filtering of
vapor and other impurities which can be present in
the pipeline network gas. Further the oil leakage in
the compressed gas has been reduced to a
minimum, using specific oil wiping rings and
multiple “dry” sealing systems. To enable the
compressor work without lubrication, sealing and
driving elements made by P.T.F.E. have been used,
reinforced by other synthetic materials according to
the most updated technology.
W Compressors
Cooling and lubrication systems
The compressors are completely cooled by a
specific forced fluid flowing inside a closed circuit
while the compressed gas is cooled at each stage
outlet to enhance the efficiency of the machine and
increase the durability of the sealing elements.
The pressurized lubrication system is automatically
managed by a PLC and it is independently driven
by a separated electrical engine so that a proper
lubrication is ensured in any working conditions.
W Compressors
Lower vibration and noise levels
The preferred choice to connect the electrical
engine and the compressor module through a
flexible joint is guaranteeing better efficiency, lower
noise level, lower maintenance requirements and
smaller dimensions.
W Compressors
W is a reciprocating compressor with crankshaftconnecting
rod-crosshead-piston
rod-piston
kinematic motion; it consists of three single effect
cylinders, one for each compression stage. Gas
suction and discharge are obtained by a concentric
valve with rings and plastic seals.
A
CARTER
FLANGEBRINGBEARING
FLYWHEEL-JOINT
CRANKSHAFT
SPLINER
SEZIONEA-A
A
W Compressors
BRC Compressor Performances
4000
3500
Capacity [Sm 3/h]
3000
2500
2000
1500
1000
500
0
0
5
10
15
20
25
30
35
40
45
50
55
Intake pressure [barg]
55 kW
75 kW
90 kW
110 kW
132 kW
160 kW
200 kW
60
65
70
BRC Compressors
The above characteristics are just an indication.
The capacity and power characteristics could
change according CNG composition, ambient
conditions and P&I configuration.
The BRC compression stations can be
personalized to make them suitable for the different
customers’ needs. The basic three stages, single
effect configuration can be modified according to
the requested flows and inlet and outlet pressures.
BOOSTER Compressors
BOOSTER is a reciprocating compressor
driven by a hydraulic double effect, cylinder.
It’s, in fact, a fourth compression stage that
allows to fill the high pressure storage tanks.
Typical P&I diagram
compression station
VENT
control safety
panel
P
20x3
250 bar
28x3
20x3
200 bar
P
20x3
28x3
20x3
20x3
12x2
12x2
20x3
28x3
20x3
20x3
20x3
booster
20x3
200 bar
12x2
2" x 3.6
20x3
28x3
28x3
suction
pressure
6 bar
220 bar
28x3
20x3
20x3
12x2
220 bar
R.P.
12x2
10x1.5
220 bar
6 bar
MP
AP
200 bar
250 bar
200 bar
acqua + glicole
see P.&I. diagram
compressor
20x3
20x3
20x3
20x3
P
250 bar
20x3
20x3
system inside the compressor
container
CHECK VALVE
SAFETY VALVE
PRESSURE GAUGE
BALL VALVE WITH PNEUMATIC ACTUATOR
PRESSURE SWITCH
BALL VALVE NORMALLY CLOSED
FILTER
P
PRESSURE SENSOR
BALL VALVE NORMALLY OPEN
HEAT EXCHANGER
CONDENSATE SEPARATOR
Typical P&I diagram
compressor
VENT
28x3
14
13
18
16
T
19
200 bar
200 bar
20x3
storage tanks M.P.
water + glicole
p max = 3 bar
12x2
15
20x3
28x3
200 bar
18
10
9
12
T
28x3
28x3
62 bar
28x3
62 bar
water + glicole
p max = 3 bar
12x2
flanged connection DN 50
11
6 bar
19 bar
62 bar
28x3
5
28x3
4
T
2°
3
1°
2
3°
8
1
P
6x1
35x3
19 bar
2"x3.6
vent
6
18
12x2
19 bar
35x3
7
water + glicole
p max = 3 bar
NOTE : inlet /outlet water liner
(cylinders cooling ) 1" GAS