This standard outlines the essential criteria and testing procedures for carbon dioxide when utilized as a fire suppression agent in fire protection systems. It defines acceptable limits for purity, moisture, oil, and sulfur compounds to guarantee the efficacy and safety of CO2-based fire extinguishing solutions. The specification is vital for manufacturers, suppliers, and fire safety professionals involved in the design, installation, and upkeep of CO2 fire protection equipment.
Overview
This standard outlines the essential criteria and testing procedures for carbon dioxide when utilized as a fire suppression agent in fire protection systems. It defines acceptable limits for purity, moisture, oil, and sulfur compounds to guarantee the efficacy and safety of CO2-based fire extinguishing solutions. The specification is vital for manufacturers, suppliers, and fire safety professionals involved in the design, installation, and upkeep of CO2 fire protection equipment.
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Frequently Asked
Per the IS 15222:2002 requirements, carbon dioxide used for fire suppression must have a minimum purity of 99.5% by volume. Additionally, moisture must not exceed 10 ppm, acidity (expressed as sulfuric acid) should be below 0.0005%, non-condensable gases must be under 0.2%, and oil contamination should be absent or negligible. Adhering to these parameters ensures the CO2 is suitable and safe for effective fire extinguishing.
Water content in CO2 is quantified using a gravimetric method where the gas sample passes over phosphorus pentoxide (P2O5), which absorbs moisture. Sampling involves a vertical cylinder with a dip-tube valve connected to an evaporator and analyzer, with care taken to avoid condensation by maintaining connections above the dew point. The maximum permissible water content is 0.015% by mass. The purity including moisture is verified using gas-liquid chromatography or volumetric analyzers with precision of at least 0.1%.
The standard prescribes vaporizing a liquid CO2 sample and then passing the vapor through carbon tetrachloride to extract oil residues. The cylinder is also washed with carbon tetrachloride to collect any remaining oil. The combined extracts are analyzed using an infrared spectrometer at 3460 nm, corresponding to the C-H stretching frequency, to determine oil concentration. This technique ensures sensitive and accurate measurement of oil contaminants in carbon dioxide.
CO2 must be stored in cylinders compliant with standards such as IS 7285 or IS 4152. Each cylinder should be clearly and permanently marked with the manufacturer's name or trademark, month and year of manufacture, the label 'Carbon Dioxide', cylinder source, year of manufacture, test pressure, empty weight, and the filled weight. Optionally, the BIS Standard Mark may be applied. Proper sampling from the same production batch is required for testing. Equipment must also be designed to safely contain the internal pressures of CO2.
Handling equipment must be engineered to withstand or be shielded from the high pressures of CO2. Use carbon dioxide with purity not less than 99.5% and limit water content to 0.015% by mass to prevent corrosion and frost hazards. Oil contamination must not exceed 5 ppm by mass, and total sulphur compounds should be kept below 5 ppm to avoid corrosive damage. Regular inspection and maintenance are essential to prevent leaks or failures, and cylinders should be handled carefully to avoid sudden depressurization or mechanical harm.
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