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Confusion Over K Class of Fire Extinguishers

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How many different classes of fires are referenced in the 2002 Edition of NFPA 10? ... Class K Fires in cooking appliances that involve combustible cooking media ... – PowerPoint PPT presentation

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Title: Confusion Over K Class of Fire Extinguishers


1
  • Confusion Over K Class of Fire Extinguishers
  • Agenda Item 4.2
  • Kerry Bell
  • PDE Suppression

2
Class K Extinguishers
Reported Concern
  • Potential confusion by plant personnel regarding
    Class K extinguishers and extinguishers
    identified as Purple K extinguishers

3
Fire Class Quiz
How many different classes of fires are
referenced in the 2002 Edition of NFPA 10?
  • 2
  • 3
  • 4
  • 5
  • 6

4
Fire Classes
  • Class A Fires in ordinary combustible materials
    such as wood, cloth, paper, rubber and many
    plastics.
  • Class B Fires in flammable liquids, combustible
    liquids, petroleum greases and oils, alcohols,
    flammable gases, etc.
  • Class C Fires that involve energized electrical
    equipment.
  • Class D Fires involving combustible metals,
    such as magnesium, titanium, zirconium, sodium,
    lithium and potassium.
  • Class K Fires in cooking appliances that
    involve combustible cooking media (vegetable or
    animal oils and fats).

5
Class K Extinguishers
Background
  • Purple K (potassium bicarbonate) dry chemical
    extinguishers have been available since the early
    1960s.
  • Extinguishers containing the Purple K dry
    chemical have a BC rating.
  • The Class K rating was first introduced into 1998
    edition of NPFA 10.

6
Label Examples
7
Label Examples
8
Label Examples
9
Label Examples
10
Class K Fire Extinguishers
Summary
  • Jim Roberts requested that UL approach the
    extinguisher manufacturers and ask their
    voluntary cooperation to reduce the potential for
    confusion on this issue.
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