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This Presentation Developed By Drew R. Smith. This presentation may be modified or reproduced by individual fire departments or training organizations provided it is not used to generate revenue or in any commercial manner. The New Class. Class K. Background.

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This presentation developed by drew r smith

This Presentation Developed ByDrew R. Smith

This presentation may be modified or reproduced by individual fire departments or training organizations provided it is not used to generate revenue or in any commercial manner.



Background
Background

In the past ten years or so there has been a major change in commercial cooking involving deep-fat fryers and cooking medias

Class K Fires & Portable Extinguishers


Fryers
Fryers

  • Older deep-fat fryers were either uninsulated or lightly insulated

  • Newer deep-fat fryers are well insulated

    Thus, older fryers cool faster than newer fryers

Class K Fires & Portable Extinguishers


Cooking media
Cooking media

  • Older fryers used animal fat

  • Newer fryers use vegetable oil

    Vegetable oils cook at higher temperatures than animal fat

Class K Fires & Portable Extinguishers


This presentation developed by drew r smith

Class K Fires & Portable Extinguishers


This presentation developed by drew r smith

New AI Temp

AI Temp

ROOM TEMP

HEATED

Class K Fires & Portable Extinguishers


This presentation developed by drew r smith

Class K Fires & Portable Extinguishers


A new class of fire is born
A new class of fire is born auto-ignition temperature the fire will reflash and burn

NFPA 10 defines Class K as

Fires in cooking appliances that involves combustible cooking media (vegetable or animal oils or fats)

Class K Fires & Portable Extinguishers


This presentation developed by drew r smith

Dry Chemical Agents sodium bicarbonate or potassium bicarbonate, when applied to burning cooking oils create a chemical reaction known as saponification

Class K Fires & Portable Extinguishers


This presentation developed by drew r smith

  • All cooking oils, greases and fats contain free fatty acids (saturated fat)

  • When added to a free fatty acid, alkaline extinguishing agents (such as sodium bicarb or potassium bicarb) form a soap foam on the oil’s surface

  • This soap foam performs just like regular firefighting foam to secure vapors and extinguish the fire

Class K Fires & Portable Extinguishers


This presentation developed by drew r smith
When dry chemical is used to create this (saturated fat)saponification it will not cool all of the oil in the fryer

Class K Fires & Portable Extinguishers


Wet chemicals liquids that contain an alkaline agent are more effective
Wet chemicals (liquids) that contain an alkaline agent are more effective

  • Agents may contain potassium acetate, potassium citrate and/or potassium carbonate

  • Applied in a fine mist the agents cool and form the saponification

  • These to action cool the oil to below its auto-ignition temperature

Class K Fires & Portable Extinguishers


Ul tests verify this
UL tests verify this more effective

  • UL conducted dozens of tests comparing Class B-rated dry chemical portable fire extinguishers with these new Class K wet agent portable fire extinguishers

  • Tests showed that an 80B (20#) extinguisher that put out a 200-square foot pan fire could not put out a deep-fat fryer with only a 2& sq-foot surface

Class K Fires & Portable Extinguishers


This presentation developed by drew r smith

Class K Fires & Portable Extinguishers


As a side note
As a side note... only to reignite

  • Wet agents can be found in both permanent systems and portable fire extinguishers

  • They are applied using fine mist nozzles to reduce splashing

  • Most permanent kitchen extinguishing systems display a permanent making stating the equipment is UL300-compliant

Class K Fires & Portable Extinguishers


This presentation developed by drew r smith

Class K Fires & Portable Extinguishers


Class k fire extinguishers
Class K Fire Extinguishers only be used AFTER the installed system is activated

  • Also carry a class A & B rating

  • Class K rating does not carry a number value such as class A & B ratings

Class K Fires & Portable Extinguishers


This presentation developed by drew r smith

Wet Agent units are available in both 1&1/2 only be used AFTER the installed system is activatedand 2&1/2 gallon units

Both the 1&1/2 and 2&1/2 gallon units carry 2-A:1B ratings

While dry-agent Class K extinguishers are available, this program focuses on wet-agent extinguishers

Class K Fires & Portable Extinguishers


Fire department operations
Fire Department Operations only be used AFTER the installed system is activated

  • Recognize the situation and the need for the Class K fire extinguisher

  • Activate the installed system first

  • Wearing full protective gear, apply the wet agent from the portable fire extinguisher

  • Apply all the agent in the extinguisher EVEN if the fire appears to be out

Class K Fires & Portable Extinguishers


Remember
REMEMBER only be used AFTER the installed system is activated

Wet agents works by cooling AND saponification

Class K Fires & Portable Extinguishers


References
References only be used AFTER the installed system is activated

  • “The New Class”, J. Craig Voelkert, NFPA Journal, July/August 1999

  • NFPA 10 - Standard for Portable Fire Extinguishers, 1998 Edition

Class K Fires & Portable Extinguishers


The end
The End only be used AFTER the installed system is activated

Class K Fires & Portable Extinguishers