توضیحات :
NFPA 18 – Standard on Wetting Agents
۲۰۲۱ Edition
Chapter I Administration
۱-۱ * Scope. This standard addresses qualification tests, methods of evaluation, and general rules for application of wetting agents and wetting agent solutions as related to fire control and extinguishment.
۱-۲ Purpose. This standard provides the requirements for the performance and use of wetting agents as related to fire control and extinguishment and is prepared for the guidance of the fire services, authorities having jurisdiction, and others concerned with judging the acceptability and use of any wetting agent offered for such a purpose.
۱-۳ Application. This standard applies to wetting agents and wetting agent solutions for use on Class A and Class B 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.
۱-۵ Equivalency. Nothing in this standard is intended to prevent the use of systems, methods, or devices of equivalent or superior quality, strength, fire resistance, effectiveness, durability, and safety over those prescribed by this standard.
۱-۶ Units and Formulas. When a primary value for measurement in metric units as given in this standard is followed by a parenthetical equivalent value in U.S. units, the primary metric value stated is to be regarded as the requirement.
۱-۶-۱ Metric units of measurement in this standard are in accordance with the modernized metric system known as the International System of Units (SI) .
۱-۶-۲ The conversion procedure used for the U.S. units is to multiply the primary SI quantity by the conversion factor and then round the result (if necessary) to the appropriate number of significant digits.
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