![Page 1: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/1.jpg)
CXS490 CO2
Total Flooding Systems
1
![Page 2: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/2.jpg)
Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.).
Examples of application:• Drying ovens,• Switch-gear rooms,
• Fume exhaust systems,
• Storage rooms, etc.
2
Application
![Page 3: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/3.jpg)
• Calculated volume may be reduced for space occupied by fixed impermeable objects.• Type combustible (fuel) and possibility of potential deep-seated fire• Minimum design concentration. • Range 34% to 75% from table found in NFPA 12.• Volume factor (assumes 34% design concentration) & surface fire.• Minimum quantity require adjustments based on possibility deep seated fire could result, temperature & uncloseable openings.
3
Total Flooding Design
![Page 4: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/4.jpg)
Deduction allowance for fixed objects
In figuring the net cubic capacity to be protected, due allowance permitted to be made for permanent,non-removable, impermeable structures materiallyreducing volume.
4
Deduction
![Page 5: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/5.jpg)
Can use factors in two ways (multiply by smaller or divide by larger factor).
2000 ft3 ---> 20 ft3/lb or 0.05 lb/ft3
W = V x FV = 2000 x 0.050 or 2000 20
Volume factor used to determine the basic quantity of carbon dioxide to protect an enclosure containing a material requiring a design concentration of 34 percent in accordance with the following Tables:
5
Volume Factor
![Page 6: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/6.jpg)
6
Volume Factor - Metric
![Page 7: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/7.jpg)
7
Volume Factor - Imperial
![Page 8: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/8.jpg)
As average small space has proportionately more boundary area per enclosed volume than a larger space, greater proportionate leakages are anticipated and accounted for by graded volume factors in the tables.
8
Deduction
![Page 9: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/9.jpg)
Formula
9
W = V x FV x FC
where:V = Volume (m3 or ft3)FV = volume factor (kg/m3 or lb/ft3)FC = concentration factor
![Page 10: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/10.jpg)
For materials requiring a design concentration over 34 percent, basic quantity of carbon dioxide calculated from the volume factor given in the tables and increased by multiplying quantity by appropriate conversion factor given in the following figure:
10
Material Conversion Factor
![Page 11: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/11.jpg)
11
Minimum Design Concentration
![Page 12: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/12.jpg)
12
Material Conversion Factor
![Page 13: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/13.jpg)
In two or more interconnected volumes where “free flow” of carbon dioxide can take place, the carbon dioxide quantity shall be sum of the quantities calculated for each volume, using its respective volume factor from the tables.
If one volume requires greater than normal concentration, higher concentration shall be used in all interconnected volumes.
13
Interconnected Volumes
![Page 14: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/14.jpg)
14
CO2 Calculation
Space with dimensions of11.43 m long by 10.69 m wideby 2.72 m high is to beprotected by CO2.The operating temperature range is 10 to 40OC.The room contains a process that generatessignificant amounts of Methyl Ethyl Ketone (MEK)& Carbon Disulfide (CS2).Determine the required amount of agent and thenumber of Cylinders.
![Page 15: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/15.jpg)
15
CO2 CalculationReview the fuels & Determine which Minimum DesignConcentration (MDC)to use: MEK is 40 % & CS2 is 72 %.Use MDC of 72 % - meets more stringent requirements.
FV = 0.80 from Chart 2-3.3(b)FC = 3.0 from Figure 2-3.4Cylinder sizes 34, 45 (most common) & 54 kg - Use largest
cylinders
![Page 16: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/16.jpg)
Additional quantities of carbon dioxide shall be provided to compensate for any special condition that can adversely affect extinguishing efficiency.
16
Special Conditions
![Page 17: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/17.jpg)
Openings that cannot be closed at time of extinguishment shall be compensated for by addition of a quantity of carbon dioxide equal to anticipated loss at design concentration during a 1-minute period.
This amount of carbon dioxide shall be applied through the regular distribution system.
17
Openings
![Page 18: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/18.jpg)
Losses
18
Room 9 ft ceiling
7 ft Door open
Centre above 5.5’
To MDC Line
17 lb/min-ft2
21 ft2 x 17Loss = 357lb/min
![Page 19: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/19.jpg)
For ventilating systems that cannot be shut down, additional carbon dioxide shall be added to space through the regular distribution system in an amount computed by dividing/multiplying volume moved during the liquid discharge period by flooding factor.
This shall be multiplied by material conversion factor when design concentration is greater than 34 percent. 19
VentilationSystems
![Page 20: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/20.jpg)
For applications where the normal temperature of the enclosure is above 200°F (93.3 °C):• 1% increase in calculated total quantity of CO2 provided for
• each additional 5°F (2.77°C) above 200°F (93.3 °C)
20
High Temperature
![Page 21: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/21.jpg)
For applications where the normal temperature of the enclosure is below 0°F (-17.8 °C)• 1% increase in calculated total quantity of CO2 for
• each 1 °F (0.55 °C) below 0°F (-17.8°C).
21
Low Temperature
![Page 22: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/22.jpg)
Under normal conditions, surface fires are usually extinguished during the discharge period.
Except for unusual conditions, it will not be necessary to provide extra carbon dioxide to maintain the concentration.
22
Surface Firew
![Page 23: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/23.jpg)
If a hazard contains a liquid having an auto-ignition temperature below its boiling point, then CO2
concentration shall be maintained for a period sufficient for liquid temperature to cool below itsauto-ignition temperature.
23
Hazard Cooling
![Page 24: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/24.jpg)
A minimum flooding factor of 8 ft3/lb (0.22 m3/kg) is used in ducts and covered trenches.
If combustibles represent a deep-seated fire more CO2 will be required to meet deep seated fire requirements.
24
Ducts & Trenches
![Page 25: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/25.jpg)
CO2 RequirementsDeep-Seated Fires
25
![Page 26: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/26.jpg)
Quantity of carbon dioxide for deep-seated-type fires is based on fairly tight enclosures.
After the design concentration is reached, concentration shall be maintained for a substantial period of time, but not less than 20 minutes.
Any possible leakage shall be given special consideration because no allowance included in basic flooding factors.
26
Maintain Concentration
![Page 27: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/27.jpg)
For combustible materials capable of producingdeep-seated fires, required CO2 concentrations cannot be determined with the same accuracy possible with surface burning materials.
Extinguishing concentration varies with mass of material present because of thermal insulating effects.
Flooding factors determined on basis of practical test conditions.
27
Flooding Factors Outline only
![Page 28: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/28.jpg)
28
Flooding Factors Outline only
![Page 29: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/29.jpg)
Minimum design rate of application based on quantity of carbon dioxide & maximum time to achieve design concentration
For surface fires, design concentration shall be achieved within 1 minute from start of discharge.
29
Design Rate Outline only
![Page 30: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/30.jpg)
For very tight enclosures, necessary area of free venting calculated from following:
30
Venting Outline only
![Page 31: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/31.jpg)
Satisfactory results will usually be achieved by assuming expansion of CO2 at 9 ft3/lb (0.56 m3/kg).
31
Acceptable ResultsOutline
![Page 32: CXS490 CO 2 Total Flooding Systems 1. Creation of an inert atmosphere in rooms or other enclosure (oven, ducts, etc.). Examples of application: Drying](https://reader037.vdocuments.us/reader037/viewer/2022110321/56649cff5503460f949cfdcb/html5/thumbnails/32.jpg)
32
Strength & PressureOutline / Overview