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The explosive limit of the mixture of steam and air is 16 to 25% (the most flammable concentration is 17%).
According to the National Standard "Occupational Exposure Limits for Harmful Factors in the Workplace" GBZ2-2002, the maximum allowable concentration of ammonia in the workshop is 30mg/M3, which is approximately 39.5ppm. In the actual test, usually refer to the following values:
Average Threshold (TLV-TWA): 25 (usually set as primary alarm point)
Instantaneous threshold (TLV-STEL): 35 (usually set to secondary alarm point)
Dangerous Concentration (IDLH): 100ppm-500ppm
The concentration of ammonia in the atmosphere The body's physiological response 5~10ppm nose can detect its odor.
20ppm senses the special smell of ammonia.
40ppm A small number of people experience mild irritation in the eyes.
Exposure of 100 ppm minutes causes considerable irritation of the eyes and nasal cavity.
400ppm causes severe irritation of the throat, nasal cavity and upper respiratory tract.
Exposure to 700 ppm for more than 30 minutes may cause permanent eye damage.
1700ppm of severe cough and wheezing can be fatal within thirty minutes.
5000ppm severe pulmonary edema, suffocation can be fatal for a moment.
two. Ammonia Safety Regulations 1 Ammonia Storage Area - No Phenoxy2 Non-Administration personnel are not allowed to change or adjust the safety valve and release valve on their own.
3 Wear safety equipment when operating the valve and drain valve (Drain Valve).
4 It must be determined that all valve line equipment and other conditions are normal and appropriate.
5 If any equipment failure or ammonia leak is found, take immediate emergency measures.
6 In the event of a typhoon, lightning, earthquake, air raid or emergency, stop loading and unloading and make safety measures.
7 Do not knock on the frozen ice outside the valve.
8Human protection safety equipment should be fixed place, easy access to the place.
(9) Sampling devices shall be installed, and other air release valves, drain valves, etc. shall not be sampled.
10 Storage tanks, pipelines, and ancillary equipment are subject to periodic inspections.
Fourth emergency response measures:
1.1 When ammonia leaks, try to stop leaking in case of safety 1.2 If ammonia leakage or discharge is harmful to people's health care, they should immediately report to the competent authorities such as the Environmental Protection Agency, Bureau, and Labor Inspection Office.
1.3 Warn the residents who may endanger the area and evacuate the residents in the downwind areas to the upwind area. The contaminated areas should be clearly indicated.
No entry.
1.4 When ammonia leaks, remove the fire source immediately to avoid explosion.
1.5 The application instrument detects the concentration of ammonia.
1.6 The repair of ammonia leaks should wear appropriate personal protective equipment.
1.7 A large amount of mist is absorbed when ammonia leaks.
1.8 Detoxification equipment should be available when ammonia is emitted.
Liquid ammonia leakage detector in safety production precautions
one. Ammonia Hazard Introduction Ammonia is a colorless gas, toxic, and hazard class 2.2. Irritating taste. Common refrigerants. Formula NH3. Molecular weight 17.03. The relative density is 0.7714 g/l. -77.7 ° C melting point. The boiling point -33.35 °C. Self-ignition point 651.11 °C. Vapor density 0.6. Vapor pressure 1013.08 kPa (25.7 °C).