What is wet chemical system?
A wet chemical system is an early detection preventive solution that is especially designed for commercial kitchens. It can potentially save lives (and business operations) from the disastrous results of common cooking fires that get out of hand.
What is NFPA 17 a?
NFPA 17A is a must-have for anyone who purchases, designs, installs, tests, inspects, approves, lists, operates, or maintains pre-engineered wet chemical fire extinguishing equipment. Major revisions to the 2021 edition include: Addition of a chapter addressing wet chemical extinguishing systems for mobile equipment.
Where are wet chemical extinguishing systems used?
commercial cooking operations
Wet chemical fire extinguishing systems are most commonly used to provide fire protection in commercial cooking operations. These commercial cooking operations include restaurants, plenums, institutional hoods, ducts, filters, and other cooking appliances.
How frequently must wet chemical fire extinguishing systems must be tested and inspected?
The standards applicable to automatic dry- or wet-chemical fire-extinguishing systems protecting kitchen cooking equipment [see NFPA 17(98), Sec. 9-2.1/NFPA 17A(98), Sec. 5-2.1] require that such systems be inspected monthly to ensure that: The extinguishing system is in proper operation.
How do you use wet chemicals?
Squeeze the lever slowly to begin discharging the extinguisher. Apply the fine spray in slow circular movements, this allows the wet chemical agent to fall gently onto the surface of the fire and helps to prevent hot oils or fats splashing the user or spreading the fire.
Which chemical is used in wet chemical fire extinguisher?
Potassium
Potassium is the chemical element that is used in a wet chemical fire extinguisher. Potassium salts are created as a fine mist that is sprayed out and then causes a reaction so that a soapy layer is formed on the surface of the fire.
What is wet chemical fire extinguisher?
Wet chemical fire extinguishers are usually supplied with a long lance which helps to safely deploy the foam. The wet chemical forms a thick soapy foam-like blanket over the surface of the burning oil/fat which stops oxygen from reaching the fire and smothers the flames.
What is a Wet chemical extinguishing system?
The Wet Chemical Extinguishing agent is a potassium carbonate based solution which is discharged as fine droplets into a protected area. The main extinguishing action is by cooling caused by the heat of vapourisation.
What fires can wet chemical be used on?
Wet chemical fire extinguishers tackle fat and grease fires in kitchens (Class F), for example deep fat fryer fires. In addition, some wet chemical extinguishers can tackle Class A fires (wood, paper etc) and Class B fires (eg petrol).
How often should I test my sprinkler system?
Dry sprinkler systems should be tested and/or replaced after ten years. Fast-response sprinklers should be tested after 20 years and at 10-year intervals after that, and standard sprinklers should be tested after 50 years and then at subsequent 10-year intervals.
What type of fire wet chemical is used?
A wet chemical fire extinguisher can be used in the following scenarios: Class F fires; cooking fires that include the use of cooking oils, fats, lard, olive oil, and vegetable oil. Class A fires; fires that involve flammable solids like wood, textiles, and paper.
What is wet chemistry techniques?
Wet chemistry techniques can be used for qualitative chemical measurements, such as changes in color (colorimetry), but often involves more quantitative chemical measurements, using methods such as gravimetry and titrimetry. Some uses for wet chemistry include tests for: pH (acidity, alkalinity) Concentration.
What NFPA 12?
This standard contains requirements for carbon dioxide fire-extinguishing systems to help ensure that such equipment will function as intended throughout its life. It is intended for those who purchase, design, install, test, inspect, approve, list, operate, or maintain these systems.
What NFPA 24?
NFPA 24 helps ensure water supplies are available in a fire emergency, with detailed requirements for the installation of private fire service mains and their appurtenances supplying private hydrants and water-based fire protection systems.
What are wet chemical fire extinguishers not used for?
Wet chemical fire extinguishers only work with animal fats and vegetable oils, so they cannot be used on Class B fires involving flammable liquids such as petrol or diesel. They have usually been tested to a 13A Class A rating but should not be specified for anything other than a kitchen.
What is difference between wet and dry chemical?
A dry chemical fire extinguishing agent is a powdery substance that extinguishes a fire by smothering it and interrupting the chemical reaction by creating a barrier the fuel and oxygen. Wet chemical fire extinguishing agents include a blend of potassium acetate and potassium citrate and are used on Class K fires.
When should you use a wet chemical fire extinguisher?
Wet chemical extinguishers are used for cooking oil fires, or more specifically deep fat fryer fires. This type of fire is different from other categories because water, foam, powder and even CO2 extinguishers will actually aggravate an oil fire rather than extinguish it.
What should a wet chemical extinguisher not be used on?
Do fire sprinkler heads expire?
Even with regular maintenance, sprinkler heads do not last forever. Fire safety protocol recommends you get sprinkler heads replaced once every five years to prevent fire sprinkler leaks.
Does NFPA require wet chemical fire extinguishing systems?
Considering the escalating Kitchen related fire cases in the country, NFPA provides necessary instructions and recommendations regarding the Wet chemical extinguishing systems to control cooking-related fire accidents. Wet chemical fire extinguishing systems are most commonly used to provide fire protection in commercial cooking operations.
What is wet chemical fire suppression system?
Wet Chemical Fire Suppression. The wet chemical suppression system is what most people understand as the traditional fire suppression system, for instance in a commercial kitchen. This extinguishing method is specific to the cooking fires that may occur in residential and commercial settings. The suppressant is a liquid substance that,
What is wet chemical extinguishing system?
What is Wet Chemical Extinguishing System, its applications, and how it works?! 1 Cooling the grease surface. 2 React with the hot grease and forming a layer of soap like foam on the surface of the fat, this layer act as an… More
What are the requirements for wet chemical extinguishing systems installation?
Requirements for Wet Chemical Extinguishing Systems installation. According to NFPA 17A, wet chemical extinguishing systems shall be approved by an authorized person. Before the installation, the installing contractor shall ensure that appliances, pipes, hoods, and ducts are correctly positioned and protected according to the standard.