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Marioff HI-FOG GPU Systemsfor the protection of
Industrial Applications
Marioff HI-FOG Training
5 August 2008
Amit Lior
What is GPU?
Marioff HI-FOG GPU is the only water-mist system propelled by a Gas-driven Pump Unit.
Like accumulator units, the GPU is using compressed gas as propellant and as atomizing agent, yet the GPU utilizes non-compressed water source.
GPU system is actuated either manually or automatically.
Provided with gas cylinders and a water tank, the GPU is a self contained unit, requiring no supply of electric power or water for operation
Marioff HI-FOG GPU was tested for both fire-righting ability and for component qualities to the satisfaction of FM (USA), VdS (Germany), and VNIIPO (Russia).
Applicable Standards
NFPA 750 Standard on Water Mist Fire Protection Systems
FM Approval Standard Class 5560
VdS Standard
IMO
Applications
Machinery Space:
oil pumps
oil tanks
fuel filters
transformer vaults
gear boxes
drive shafts
lubrication skids
diesel engine driven generators
other similar machinery using fuel and/or lubrication fluids with volatilities less than or equal to light diesel
Applications
Special Hazard Machinery Space:
internal combustion engines, other equipment using fuel and/or lubrication fluids with volatilities less than or equal to Heptane.
incidental use, or storage of limited quantities of flammable liquids of not more than two 55 gal (208 L) drums.
Applications
Turbine Enclosures
Protected Enclosures
VdS Approved:
Maximum enclosure height 5 m
Maximum enclosure volume 500 m3
FM Approved:
Maximum enclosure height 7,5 m
Maximum enclosure volume 750 m3
IMO Approved:
Maximum enclosure height 7,5 m
Maximum enclosure volume 1500 m3
Also:
All ventilation openings and\or forced ventilation arrangement shall be capable of automatic closure or shut-down prior to system discharge.
Structure & Components
Each GPU consists of:
Gas-Driven Pump Unit module
Bank of compressed gas cylinders, including actuator valves.
Section Valve
Monitoring devices (pressure gauge etc’.)
Structure & Components
Actuator Valves
Hydraulic Valve
Solenoid Valve
dP (delta P) Valve
Slave Valve
Structure & Components
Gas cylinders
Preferably provided by local supplier.
Dimensions:
Diameter: ca. 240 mm
Maximum cylinder height: 1390 mm - 1525 mm
Thread type: 24,32 1,814 SFS2292
(adaptor applicable for several options)
Amount of gas cylinders depends on:
Number of spray-heads
Duration of discharge
Structure & Components
Monitoring Devices Pressure Gauge- Water Input line
Pressure Gauge- Output line
Pressure Gauge- Gas Cylinder (included in actuation valves)
Pressure Switch- Gas Cylinder (included in actuation valves)
Structure & Components
Additional Devices
Shutoff Valve
Protection caps
Protective cabinet
Operation
Standby
All section valves closed.
Pressure of ca. 25 bar in maintained by the standby pump.
All actuator salves are closed.
There is no flow in the system.
H DPSSSSSSSSS
SSSSSSSSS
H DPSSSSSSSSS
SSSSSSSSS
Operation
Start Signal
One Section Valves opened.
Some flow generated by the standby pump, but the pressure drops. H DP
SSSSSSSSS
SSSSSSSSS
H DPSSSSSSSSS
SSSSSSSSS
Operation
First Cylinder, Bank I
Hydraulic Valve opens.
Pressure increases in the manifold of cylinder bank I.
H DPSSSSSSSSS
SSSSSSSSS
H DPSSSSSSSSS
SSSSSSSSS
Operation
Bank I
Slave Valves of bank I open.
H DPSSSSSSSSS
SSSSSSSSS
H DPSSSSSSSSS
SSSSSSSSS
Operation
Discharge with Bank I
Pressure of bank I drops.
H DPSSSSSSSSS
SSSSSSSSS
H DPSSSSSSSSS
SSSSSSSSS
Operation
First Cylinder, Bank II
dP valves releases the first cylinder of bank II.
Pressure increases in the manifold of cylinder bank II. H DP
SSSSSSSSS
SSSSSSSSS
H DPSSSSSSSSS
SSSSSSSSS
Operation
Bank I
Slave Valves of bank II open.
H DPSSSSSSSSS
SSSSSSSSS
H DPSSSSSSSSS
SSSSSSSSS
Spray-Heads
4S 1MC 8MC 1000
Installed at ceiling level or above a 2m wide door
discharging downward.
4S 1MC 8MB 1000
Installed above a 2m wide door
discharging downward.
Spray-Heads
Ceiling height
Enclosure’s volume
Compressed gas
door spray-heads
5 m 500 m3 Air required for Special Hazard Machinery Spaces 5 m 500 m3 Nitrogen not required 5 m 750 m3 Air required 5 m 750 m3 Nitrogen not required
7,5 m - Air required 7,5 m - Nitrogen not required
Door spray-heads are not required for IMO approved systems.Door spray-heads are not required for IMO approved systems.
Spray-Heads
Ceiling height up to 5 m and total volume of no more than 500 m3:
Max. spacing between spray-heads 5 m.
Max. distance from walls 2,5 m.
Ceiling height up to 7,5 m and\or total volume of no more than 750 m3:
Max. area between four adjacent spray-heads 12,5 m2.
Max. distance from walls 2,5 m.
Distribution Network
Pressure Calculation:
Darcy-Weisbach calculation method is applied, assuming complete mixing of the water and gas mixture.
The spray head-specific nominal water flow rate of 12,5 litre/minute is multiplied by 1.8 and hydraulic calculations are run normally.
The calculated pressure drop must be within 5 – 15 bar.
Distribution Network
System Design
1) Application & Requirements
2) Enclosure
3) Spray-Heads location
4) Gas cylinders & Piping Network
System Design
Sample RFQ No. 1
Application: fuel storage
Dimensions: 10 m (L) 8 m (W) 6 m (H)
Fire hazard: five fuel tanks, 350 litre of Diesel fuel each
Approval authority: FM
Protection time: 30 minutes
System Design
Sample RFQ No. 2
Application: generators room
Dimensions: 14 m (L) 9 m (W) 10 m (H)
Fire hazard: two diesel generators
Approval authority: N.A.
Protection time: 60 minutes
System Design
Sample RFQ No. 3
Application: steam turbine
Dimensions: 14 m (L) 9 m (W) 7,5 m (H)
Fire hazard: steam turbine
Approval authority: FM
Protection time: 15 minutes
945 m3 945 m3
reminder: Spray-Heads
Ceiling height up to 5 m and total volume of no more than 500 m3:
Max. spacing between spray-heads 5 m.
Max. distance from walls 2,5 m.
Ceiling height up to 7,5 m and\or total volume of no more than 750 m3:
Max. area between four adjacent spray-heads 12,5 m2.
Max. distance from walls 2,5 m.
System DesignSample Spray-Heads location No. 1
Application: compressors room
Dimensions: 10 m (L) 8 m (W) 6 m (H)
Fire hazard: electric motors, compressors, oil skid (150 litre)
Compressed gas: nitrogen, 200 bar
Approval authority: FM
Protection time: 30 minutes
volume = 480 m3volume = 480 m3
door spray-heads: not required door spray-heads: not required
grid: 2 \ 1 \ 2grid: 2 \ 1 \ 2
5 m
3,2 m
2,5 m2,5 m
2 m
4 m 10,25 m2
System DesignSample Spray-Heads location No. 2
Application: generator room
Dimensions: 14 m (L) 10 m (W) 7 m (H)
Fire hazard: generator, electric cabinet
Compressed gas: air, 200 bar
Approval authority: IMO
Protection time: 60 minutes
volume = 980 m3volume = 980 m3
door spray-heads: not required door spray-heads: not required
grid: 3 \ 2 \ 3grid: 3 \ 2 \ 3
4,6 m
2,5
m5
m
2,4 m
11,5 m2
System DesignSample Spray-Heads location No. 3
Application: engine test cell
Dimensions: 12 m (L) 8 m (W) 4 m (H)
Fire hazard: motor
Compressed gas: air, 200 bar
Approval authority: FM
Protection time: 60 minutes
volume = 384 m3volume = 384 m3
door spray-heads: required door spray-heads: required
grid: 2 x 3grid: 2 x 3
4 m 2 m
2,5 m
5 m
4 m 2 m
2,5 m
5 m
reminder: Distribution Network
Pressure Calculation:
Darcy-Weisbach calculation method is applied, assuming complete mixing of the water and gas mixture.
The spray head-specific nominal water flow rate of 12,5 litre/minute is multiplied by 1.8 and hydraulic calculations are run normally.
The calculated pressure drop must be within 5 – 15 bar.
System Design
Sample Piping Network No. 1
5 m
2 m
4 m
5 m
2 m
4 m
5 m
2 m
4 m
5 m
2 m
4 m
reminder: Gas Cylinders
Amount of gas cylinders depends on:
Number of spray-heads
Duration of discharge
System Design
Gas Cylinders and Actuation Valves for Sample No. 1
5 spray-heads
30 minutes discharge
5 m
3,2 m
2,5 m2,5 m
2 m
4 m 10,25 m2
15 cylinders = two banks of 8 cylinders = two banks of 4 + two banks of 415 cylinders = two banks of 8 cylinders = two banks of 4 + two banks of 4
First release valve: HydraulicFirst release valve: Hydraulic
Second bank release: dPSecond bank release: dP
Restrictions
Site Specific:
Hazardous Areas
Temperature Range
Construction Materials
Water supply
Enclosure:
Shut-down time
Forced ventilation and openings
GPU:
Max. amount amount of spray-heads
Don’t Forget
Other system:
Detection System
Alarm
Gas supply
Additional:
Enclosure
Warenty and service
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