GB/T 20487-2018 in English

1. Standard Overview

GB/T 20487-2018 Urban Fire Risk Meteorological Grade is a national standard of the People's Republic of China, which is used to guide the meteorological grade assessment of urban fire risks. This standard replaces the old version GB/T 20487-2006, and has made important updates in terms of term definitions, indicator system and application scope.

The main purpose of this standard is to provide a scientific basis for fire planning and emergency response by analyzing the impact of meteorological factors on urban fire risks.

2. Comparison of Standard Frameworks

3. Analysis of standard implementation background and technological evolution

The evolution of urban fire risk meteorological grade standards reflects China's technological progress in the field of fire risk assessment. From the 2006 version to the 2018 version, the main changes include:

• Added adaptability to high altitudes and extreme climate conditions
• Optimized the weight allocation method of meteorological factors
• Introduced a more sophisticated color coding system

4. Standard Core Indicator System

According to GB/T 20487—2018, the assessment of urban fire risk meteorological levels is based on the following key factors:

• Daily Maximum Temperature (UFWI_T): Different temperature thresholds are set for different latitudes
• Daily Minimum Relative Humidity (UFWI_H): Humidity level is negatively correlated with fire risk
• Daily Maximum Wind Force/Speed (UFWI_W): Increased wind speed significantly increases the speed of fire spread
• Number of consecutive days without precipitation (UFWI_NR): drought conditions increase fire risk
• Daily precipitation (UFWI_R): precipitation has a regulatory effect on reducing the fire risk level

5. Implementation Suggestions