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LARGE FILLING STATIONS
COMPRESSORS H10/H15
The modules equipped with H10 and H15 machines are adapted to meet the
output requirements of large CNG filling stations. The principles governing their
design are aimed at satisfying users:
‐ Sober and simple looks for easy maintenance and long lasting appearance,
‐ Efficient technology for a long operational lifespan,
‐ Perfect modularity for maximum reduction in costs and installations times.
The innovative solutions help the operator remain calm and composed:
‐ For access to checks and maintenance: a completely unobstructed and rapidity
exchangeable electric compressor unit,
‐ For heat exchange: a gas cooling zone placed at a height in a perfectly natural
convection flow,
‐ For acoustic processing of noise nuisance: large baffles for the passage of
ventilation air and thick absorbing complexes on the sides.
FUNCTIONAL DESCRIPTION : GAS AND LUBRICANT FLOW DIAGRAM
The sketch of this page shows the gas circuit in the unit with all components used for a safe operation:
‐ Gas temperature: the gas temperature is maintained close to ambient level by heat exchangers located after each
compression stage.
‐ Gas quality: gas conditioning is achieved by separators and filters located after each step of pressurization. A drain
mechanism automatically monitored is devoted to vent condensates.
Mechanical blocks are reciprocating design. Pistons operating on one side are single effect.
Heat exchange is fully achieved by ventilated air.
‐ Safeguard of parts in friction: the lubrication circuit delivers oil in any point under hard constraint (pistons,
cylinders, crankshaft and rods) with a regulated under pressure flow.
‐ Control and safety: safety valves and pressure switches are located in accurate positions to check any abnormal
running and to stop immediately the unit.
1 ‐Safety valve
2 ‐Condensates drain mechanism
3 ‐ Pressure gauge
4 ‐ Cooler
5 ‐ Separator
6 ‐ Intake filter
7 ‐ Lube oil level
9 ‐ Back pressure regulator
10 ‐ Bleeder
11 ‐ Oil pressure switch
12 ‐ Pressure switch
13 ‐ Oil pump
14 ‐ Vent line to intake
15 ‐ Oil filter. 16 ‐Heating
MECHANICAL BLOCK
Crankcase: Made in high resistance cast iron under vacuum impregnated to obtain the best tightness. Crankcase
connected on intake pipe. Oil filling system allowing lubricant supply without pollution. Lubricant level sight glass.
Cylinders: First stage straight. Second and third stages stepped for piston guide and
Compression piston. The cylinders are distributed according to a half star configuration around the crankcase so as
to ensure the proper ventilation of all the parts. The cast part is fitted with a sufficient number of fins.
Cylinder head: They hold the dual functions valves (suction/discharge) using a «sandwich» type assembly. Fitted
with a sufficient number of fins so as to provide radiating cooling.
Automatic valves: 1st, 2nd and 3rd stage concentric design with high grade polymer disc (PEEK) and return
spring. 4th stage: concentric design, disc type with return spring.
MECHANICAL CONSTRUCTION
Crankcase: With two bearings and a crank pin. With balance weight.
Connecting rods: Three bush‐mounted straight connecting rods set on the crank pin.
Pistons: 1st stage straight. 2nd, 3rd and 4th stages stepped.
Shaft end oil and gas tightness: Drive side: lip seal in high grade plastic compound sliding on ceramic coated
layer. Opposite side: cover with O ring.
Heat exchange: The heat exchangers for gas cooling between stages and on final discharge are installed far from
the compressor unit. Two heat exchange assembly are available :
‐ Low pressure exchanger group: 1st to 2nd stage / 2nd to 3rd stage.
‐ High pressure exchanger group: 3rd to 4th stage / 4th stage to use.
Each one is mounted in a frame whose walls are ventilation guides. Those assemblies are in horizontal position. A
fan energizes the exchange in pulling the gas through the tubes fitted with fins.
CONDENSATES SEPARATION
A condensates separator is mounted downstream on each compression stages. It is located after the exchanger in a
place where the gas is cooled down. An oil mist separator located on the vent circuit downstream the drain
mechanisms send the separated oil back to the crankcase. Installed on the frame of the compressor unit, those
separators are frequently drained by the associated mechanisms.
ANTI POLLUTION DEVICE LINKED TO THE PROCESS
A complete tightness in the compression cycle helps in preserving the environment. The tank incorporated in the
frame in design for a tight closed loop.
Buffer tank on intake: The capacity is supplied with the gas delivered by the network and ensures a regular supply
to the first compression stage. A solenoid valve set immediately upstream stops the gas delivery while the system is
shutdown. A pressure switch controls the presence of the gas at a pressure suitable for the process (minimum
pressure release). The gas is always send back to the compressor and delivered to the user. Any vent to
atmospheric is not allowed.
Recovery tank: This capacity receives the gas delivered by the compression circuit:
‐ When the high pressure circuit inter-stages and final is depressurized,
‐ When the inter-stages and final separation are drained.
UNIT DESCRIPTION
The unit has the shape of a container. The
frame is made with welded metal sections.
The canopy is build over this frame. This
structure is made rigid to allow lifting by
crane. Walls are closed by panels on 180°
revolving hinges, for a large access to any
point of the unit. Baffles boxes located on
the roof and on the front wall are easily
dismantled to upgrade the technical access
(exchange of the unit or heavy duty
maintenance...). The electrical cabinet is
associated to the base frame with two
sliding struts. It takes place naturally out of
the dangerous area when the unit is
installed. The necessary room to install the
unit is the smallest possible: the maximum
required width to open the doors is 3.6 m
which is the standardized width of a lorry parking place.
H10: A: Length= 15 ft. B: Max. Height= 6.1 ft. C: Unit Height= 9.9 ft. D: Width= 6.2 ft.
H15: A: Length= 11.3 ft. B: Max. Height= 6.1 ft. C: Unit Height= 9.9 ft. D: Width= 6.2 ft.
NOISE ATTENUATION
Acoustic processing of noises generated by the unit is carefully achieved:
‐ Walls made of steel are coated with a damping compound and a phonic absorbent mattress. The inner face of the
panel has numerous holes where the noise is catched like in a trap.
‐ Baffles on ventilated air transit points are calculated to stop the sound waves in long inter panel channels. The
standard acoustic spectrum is shown hereafter. If it is necessary to improve the results AFSC will offer additional
external panels to reduce the surrounding noise.
OPERATION DATA
Ambient Running Temperature: ‐4° F / 104° F
Nominal Flow:
‐ System Intake Pressure1.5 psi: Delivers 35 GGE
‐ System Intake Pressure 4.4 psi: Delivers 40 GGE
Noise level: Basic sound level: 47 dBA
COMPRESSORS H10/H15
The modules equipped with H10 and H15 machines are adapted to meet the
output requirements of large CNG filling stations. The principles governing their
design are aimed at satisfying users:
‐ Sober and simple looks for easy maintenance and long lasting appearance,
‐ Efficient technology for a long operational lifespan,
‐ Perfect modularity for maximum reduction in costs and installations times.
The innovative solutions help the operator remain calm and composed:
‐ For access to checks and maintenance: a completely unobstructed and rapidity
exchangeable electric compressor unit,
‐ For heat exchange: a gas cooling zone placed at a height in a perfectly natural
convection flow,
‐ For acoustic processing of noise nuisance: large baffles for the passage of
ventilation air and thick absorbing complexes on the sides.
FUNCTIONAL DESCRIPTION : GAS AND LUBRICANT FLOW DIAGRAM
The sketch of this page shows the gas circuit in the unit with all components used for a safe operation:
‐ Gas temperature: the gas temperature is maintained close to ambient level by heat exchangers located after each
compression stage.
‐ Gas quality: gas conditioning is achieved by separators and filters located after each step of pressurization. A drain
mechanism automatically monitored is devoted to vent condensates.
Mechanical blocks are reciprocating design. Pistons operating on one side are single effect.
Heat exchange is fully achieved by ventilated air.
‐ Safeguard of parts in friction: the lubrication circuit delivers oil in any point under hard constraint (pistons,
cylinders, crankshaft and rods) with a regulated under pressure flow.
‐ Control and safety: safety valves and pressure switches are located in accurate positions to check any abnormal
running and to stop immediately the unit.
1 ‐Safety valve
2 ‐Condensates drain mechanism
3 ‐ Pressure gauge
4 ‐ Cooler
5 ‐ Separator
6 ‐ Intake filter
7 ‐ Lube oil level
9 ‐ Back pressure regulator
10 ‐ Bleeder
11 ‐ Oil pressure switch
12 ‐ Pressure switch
13 ‐ Oil pump
14 ‐ Vent line to intake
15 ‐ Oil filter. 16 ‐Heating
MECHANICAL BLOCK
Crankcase: Made in high resistance cast iron under vacuum impregnated to obtain the best tightness. Crankcase
connected on intake pipe. Oil filling system allowing lubricant supply without pollution. Lubricant level sight glass.
Cylinders: First stage straight. Second and third stages stepped for piston guide and
Compression piston. The cylinders are distributed according to a half star configuration around the crankcase so as
to ensure the proper ventilation of all the parts. The cast part is fitted with a sufficient number of fins.
Cylinder head: They hold the dual functions valves (suction/discharge) using a «sandwich» type assembly. Fitted
with a sufficient number of fins so as to provide radiating cooling.
Automatic valves: 1st, 2nd and 3rd stage concentric design with high grade polymer disc (PEEK) and return
spring. 4th stage: concentric design, disc type with return spring.
MECHANICAL CONSTRUCTION
Crankcase: With two bearings and a crank pin. With balance weight.
Connecting rods: Three bush‐mounted straight connecting rods set on the crank pin.
Pistons: 1st stage straight. 2nd, 3rd and 4th stages stepped.
Shaft end oil and gas tightness: Drive side: lip seal in high grade plastic compound sliding on ceramic coated
layer. Opposite side: cover with O ring.
Heat exchange: The heat exchangers for gas cooling between stages and on final discharge are installed far from
the compressor unit. Two heat exchange assembly are available :
‐ Low pressure exchanger group: 1st to 2nd stage / 2nd to 3rd stage.
‐ High pressure exchanger group: 3rd to 4th stage / 4th stage to use.
Each one is mounted in a frame whose walls are ventilation guides. Those assemblies are in horizontal position. A
fan energizes the exchange in pulling the gas through the tubes fitted with fins.
CONDENSATES SEPARATION
A condensates separator is mounted downstream on each compression stages. It is located after the exchanger in a
place where the gas is cooled down. An oil mist separator located on the vent circuit downstream the drain
mechanisms send the separated oil back to the crankcase. Installed on the frame of the compressor unit, those
separators are frequently drained by the associated mechanisms.
ANTI POLLUTION DEVICE LINKED TO THE PROCESS
A complete tightness in the compression cycle helps in preserving the environment. The tank incorporated in the
frame in design for a tight closed loop.
Buffer tank on intake: The capacity is supplied with the gas delivered by the network and ensures a regular supply
to the first compression stage. A solenoid valve set immediately upstream stops the gas delivery while the system is
shutdown. A pressure switch controls the presence of the gas at a pressure suitable for the process (minimum
pressure release). The gas is always send back to the compressor and delivered to the user. Any vent to
atmospheric is not allowed.
Recovery tank: This capacity receives the gas delivered by the compression circuit:
‐ When the high pressure circuit inter-stages and final is depressurized,
‐ When the inter-stages and final separation are drained.
UNIT DESCRIPTION
The unit has the shape of a container. The
frame is made with welded metal sections.
The canopy is build over this frame. This
structure is made rigid to allow lifting by
crane. Walls are closed by panels on 180°
revolving hinges, for a large access to any
point of the unit. Baffles boxes located on
the roof and on the front wall are easily
dismantled to upgrade the technical access
(exchange of the unit or heavy duty
maintenance...). The electrical cabinet is
associated to the base frame with two
sliding struts. It takes place naturally out of
the dangerous area when the unit is
installed. The necessary room to install the
unit is the smallest possible: the maximum
required width to open the doors is 3.6 m
which is the standardized width of a lorry parking place.
H10: A: Length= 15 ft. B: Max. Height= 6.1 ft. C: Unit Height= 9.9 ft. D: Width= 6.2 ft.
H15: A: Length= 11.3 ft. B: Max. Height= 6.1 ft. C: Unit Height= 9.9 ft. D: Width= 6.2 ft.
NOISE ATTENUATION
Acoustic processing of noises generated by the unit is carefully achieved:
‐ Walls made of steel are coated with a damping compound and a phonic absorbent mattress. The inner face of the
panel has numerous holes where the noise is catched like in a trap.
‐ Baffles on ventilated air transit points are calculated to stop the sound waves in long inter panel channels. The
standard acoustic spectrum is shown hereafter. If it is necessary to improve the results AFSC will offer additional
external panels to reduce the surrounding noise.
OPERATION DATA
Ambient Running Temperature: ‐4° F / 104° F
Nominal Flow:
‐ System Intake Pressure1.5 psi: Delivers 35 GGE
‐ System Intake Pressure 4.4 psi: Delivers 40 GGE
Noise level: Basic sound level: 47 dBA
