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What “IMPACT” will the changes to NFPA-12 have on the design and installation of a CO 2 system?. NFPA-12 Edition 2005. NFPA-12 Edition 2005. Reasons for changes Continuing effort to improve/enhance product features and system designs for “life safety” on both: Existing Installations

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NFPA-12 Edition 2005


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nfpa 12 edition 2005
NFPA-12 Edition 2005
  • Reasons for changes

Continuing effort to improve/enhance product features and system designs for “life safety”

on both:

    • Existing Installations
    • New Systems
nfpa 12 edition 20051
NFPA-12 Edition 2005
  • Who does this affect?
    • Manufacturers
    • Designers
    • Installers
    • Service
    • End-users/Owners
nfpa 12 edition 20052
NFPA-12 Edition 2005
  • Application /systems affected:
    • Total Flood CO2 systems applied to

Normally Occupied Spaces

    • Total Flood CO2 systems applied to

Occupiable Spaces

    • Local Application Systems
definitions per nfpa 12 edition 2005
Definitions per NFPA-12 Edition 2005
  • 3.2.4 Normally Occupied Area.

An area or space where, under normal circumstances, persons are present.

  • 3.2.5 Normally Unoccupied Area (occupiable).

An area or space not normally occupied by people but could be entered occasionally be brief periods.

  • 3.2.8 Unoccupiable Area.

An area or space which cannot be occupied due to dimensional or other physical constraints.

existing systems
Existing Systems

1.3.1 Retroactivity.

All (NO, Occupiable., Local if exposing personnel) existing systems shall be upgraded to meet the requirements for . . .

  • Safety signs in paragraph 4.2.2
  • Lockout valves in paragraph 4.2.3.6 & 4.2.3.6.1
  • Pneumatic time delays & pre-discharge alarms in paragraph 4.4.5.7

1.3.2 These upgrades shall be completed by June, 2006

safety signs
Safety Signs

4.2.2.1 Warning signs should be affixed in a conspicuous location . . .

  • In every protected space
  • At every entrance to protected spaces
  • In spaces near the protected spaces

where it is determined carbon dioxide could migrate creating a hazard to personnel . . .

safety signs1
Safety Signs

The safety sign

  • Format
  • Color
  • letter style of signal words
  • message panel letting
  • lettering size
  • safety symbols

shall be in accordance with ANSI Z535.

slide9

WARNING

Carbon dioxide gas discharge

into nearby space can collect

here. When alarm operates

vacate immediately.

Carbon dioxide gas

may cause injury or death.

personnel safety nfpa 12 continued
Personnel Safety – NFPA 12 continued…

WARNING

CARBON DIOXIDE GAS

MAY CAUSE INJURY OR DEATH

WHEN ALARM OPERATES VACATEIMMEDIATELY

Typical Warning signs shall be affixed in conspicuous locations:

typical warning signs
Typical Warning signs…

WARNING

CARBON DIOXIDE GAS

MAY CAUSE INJURY OR DEATH

WHEN ALARM OPERATES DO NOT ENTER UNTIL VENTILATED

typical warning signs1
Typical Warning signs…

WARNING

CARBON DIOXIDE GAS

MAY CAUSE INJURY OR DEATH

WHEN ALARM OPERATES OR WINTERGREEN SCENT IS DETECTED, DO NOT ENTER UNTIL VENTILATED

typical warning signs2
Typical Warning signs…

CAUTION

CARBON DIOXIDE GAS DISCHARGE INTO NEARBY SPACE CAN COLLECT HERE. WHEN ALARM OPERATES VACATE IMMEDIATELY.

CARBON DIOXIDE GAS

MAY CAUSE INJURY OR DEATH

typical warning signs3
Typical Warning signs…

CAUTION

CARBON DIOXIDE GAS

MAY CAUSE INJURY OR DEATH

VENTILATE THIS AREA BEFORE ENTERING. A HIGH CARBON DIOXIDE GAS CONCENTRATION CAN OCCUR IN THIS AREA AND CAUSE SUFFOCATION

typical warning signs4
Typical Warning signs…

WARNING

ACTUATION OF THIS DEVICE WILL CAUSE CARBON DIOXIDE TO DISCHARGE. BEFORE ACTUATING, BE SURE PERSONNEL ARE CLEAR OF AREA

safety signs2
Safety Signs

Exception:

Existing installations where facilities have written caution / warning sign procedures in place to provide:

  • information and directions to personnel
  • have a training programs established to educate personnel about signage

then said sign procedures can be used in place of ANSI Z535.

slide17

Stop/Maintenance (“lock-out”) Valve

NFPA 12 Paragraph 1-6.1.7

To prevent accidental or deliberate discharge, a “lockout” shall be provided when persons not familiar with the systems and their operation are present in a protected space.

NFPA 12 Paragraph 1-8.4

Supervision of automatic systems and manual lock-out valves shall be provided unless specifically waived by the A.H.J.

Items Required to Comply with

NFPA 12 Edition 2000

No Lockout

With Lockout

slide18

Changes Required to Comply with

NFPA 12 Edition 2005

Typ. Arrangement

w/ Mech Time Delay & Siren

new systems
New Systems

4.1.3 Carbon dioxide total flood extinguishing systems shall not be used in normally occupied enclosures if other fire extinguishing agents can be used to provide an equivalent level of fire protection to carbon dioxide.

When CO2 is determined to be the most suitable agent of choice the designer / installershall provide documentation . . . to verify that CO2 is the most suitable fire suppression agent available.

examples where co 2 should not be used
Examples where CO2 should not be used
  • Control Rooms
  • Computer Rooms
  • Data Centers
  • IT Equipment Rooms / Centers
  • Telecommunication Rooms
  • Laboratory Rooms
  • Libraries
  • Museums
nfpa 12 marine systems
NFPA 12: Marine Systems
  • 2 separate valves shall be provided for releasing CO2 into any protected space. 1 valve shall control discharge from the CO2 storage. The 2nd valve shall control CO2 discharge into the protected space(s).
  • A separate manually operated control shall be provided to operate each valve… A set of controls shall be located outside at least one of the main means of egress from each protected space.
  • Audible predischarge alarms and a minimum 20 second time delay shall be provided that depend on no source of power other than CO2.