توضیحات :
NFPA 18A – Standard on Water Additives for Fire Control and Vapor Mitigation
۲۰۲۲ Edition
Chapter I Administration
۱-۱ Scope. This standard provides the minimum requirements for water additives used for the control and/ or suppression of Class A, Class B, Class C, Class D, Class K, and lithium ion battery fires and the mitigation of flammable vapors.
۱-۲ Purpose. This standard is intended for the use and guidance of those responsible for purchasing, testing, listing, and using water additives for use on Class A, Class B, Class D, Class K, and lithium ion battery fires and the mitigation of flammable vapors.
۱-۳* Application. This standard applies to water additives utilized to prevent flammable liquid vapor explosions, remove the flammability of flammable liquid spills, or extinguish Class A, Class B, Class C, Class D, Class K, and Lithium ion battery fires.
۱-۴ Retroactivity. The provisions of this standard reflect a consensus of what is necessary to provide an acceptable degree of protection from the hazards addressed in this standard at the time the standard was issued.
۱-۴-۱ Unless otherwise specified, the provisions of this standard shall not apply to facilities, equipment, structures, or installations that existed or were approved for construction or installation prior to the effective date of the standard. where specified, the provisions of t his standard shall be retroactive.
۱-۴-۲ In those cases where the authority having jurisdiction determines that the existing situation presents an unacceptable degree of risk, the authority having jurisdiction shall be permitted to apply retroactively any portions of this standard deemed appropriate.
۱-۴-۳ The retroactive requirements of this standard shall be permitted to be modified if their application clearly would be impractical in the judgment of the authority having jurisdiction and only where it is clearly evident that a reasonable degree of safety is provided.
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