Carbon Dioxide (CO2) Systems

The original "clean" agent, carbon dioxide suppresses fire without leaving behind an agent to damage sensitive equipment. And because there is no agent to clean up, you’re back in business faster. To provide the most economical system arrangement without sacrificing performance, we offer both Total Flooding and Local Application, high pressure systems (excluding distribution pipework and fittings)

 

DESCRIPTION

Carbon dioxide is a plentiful, non-corrosive gas that does not support combustion nor react with most substances. It has a low toxicity classification by Underwriters Laboratories (Group 5a). It is commonly compressed to the liquid state for storage and transportation in DOT cylinders. Upon release, it discharges under its own pressure giving the appearance of steam as its low temperature crystalizes water in the air. For fire suppression purposes the discharge is designed to raise the carbon dioxide concentration in the hazard. This removes the free oxygen which supports combustion*, and results in fire extinguishment. The resultant lack of free oxygen dictates that total flooding hazards be evacuated immediately, and carbon dioxide from local application be avoided by personnel.

 

PERFORMANCE

Carbon dioxide is an effective fire extinguishing agent that can be used on many types of fires. It is effective for surface fires, such as flammable liquids and most solid combustible materials. It expands at a ratio of 450 to 1 by volume. Other desirable attributes are its high degree of effectiveness, its excellent thermal stability, and freedom from deterioration. In addition, carbon dioxide has so many additional commercial uses that refills are available in practically every large city or seaport throughout the world. Criteria for quantity and concentration of carbon dioxide are developed in SANS 306:4 for both local and total flooding applications.

 

ORDERING INFORMATION

Carbon dioxide cylinders for use in engineered systems may be ordered in 45kg cylinder sizes.

 

APPROVALS

The 45kg CO2 cylinders all have TUV approval certificates.

The manifolds are pressure tested to 190Bar in accordance with SANS 306:4 by a SANAS approved test station

All ancillary DAB valves, actuators and other ancillary equipment

CO2 PRODUCTS:

 

 

Ancillary Actuation Equipment


1/2" CO2 Cylinder Valve - D10963

Developed specifically for the Fire Protection Industry, this valve is servo assisted to provide light operating loads throughout the complete range of CO2 cylinder pressures.

This valve is suitable for both marine and onshore use.

 

Features include:

  • Servo assisted operation for smooth opening.
  • High flow characteristics.
  • Quick release head enabling a variety of actuators to be used.
  • Safety burst disc to protect valve and cylinder in the event of over-pressure.
  • NPT or DIN 477 cylinder threads.
  • Standard ½” CO2 threaded outlet.
  • Robust and compact body design.
  • Proven reliability through many years of service.
  • DNV type certification.

Basic Specifications

DIN 477 Valve

NPT Valve

Cylinder Thread

DIN 477

1" NPT

Outlet Thread

1/2" CO2 (0.860" x 14TPI)

1/2" CO2 (0.860" x 14TPI)

Syphon Tube Thread

16 x 1 mm

3/4" x 20TPI Whit Form

Burst Disc Pressure

190 BAR

Flow Rate

80% CO2 in 23 Seconds for NPT Valve

Pressure Drop

Equivalent length 9 feet of ½” schedule 80 pipe

Type Approvals

Det Norske Veritas. (DNV)

 

1/2" Solenoid Operated CO2 Cylinder Valve - D11095

Developed specifically for the Fire Protection industry, the valve is designed to be operated electrically. It is typically used as the master valve and used to actuate other cylinder valves in the system. This valve is suitable for both marine and onshore use.

 

Features include:

  • · Servo assisted operation for smooth opening.
  • · High flow characteristics.
  • · Internal cylinder pressure used to actuate the solenoid valve.
  • · Actuator can be safely disconnected from the valve for testing purposes.
  • · Solenoid can be safely removed for testing purposes
  • · Bleed valve fitted in event of leakage.
  • · Manual over-ride lever fitted as standard.
  • · Safety burst disc to protect valve and cylinder in the event of over-pressure.
  • · NPT or DIN 477 cylinder threads.
  • · Standard ½” CO2 threaded outlet.
  • · Robust and compact body design.
  • · Proven reliability through many years of service.
  • · 240VAC or 24VDC variants available.

Basic Specifications

DIN 477 Valve

NPT Valve

Cylinder Thread

DIN 477

1" NPT

Outlet Thread

1/2" CO2 (0.860" x 14TPI)

1/2" CO2 (0.860" x 14TPI)

Syphon Tube Thread

16 x 1 mm

3/4" x 20TPI Whit Form

Burst Disc Pressure

190 BAR

Flow Rate

80% CO2 in 23 Seconds for NPT Valve

Pressure Drop

Equivalent length 9 feet of ½” schedule 80 pipe

Minimum

Maximum

Operating Temperature

-20 degrees C

+50 degrees C

Pressure Range

7 BAR - 100 PSI

140 BAR - 2030 PSI

Solenoid Details

Volts

Watts

#22X0284OEM

24VDC

10

#22X0321OEM

240VAC 60 Hz (220VAC 50 Hz)

10

 

CO2 Valve Actuators.

 

Our wide range of actuators are designed to be fitted directly on top of our CO2 cylinder valves. Our range includes, Pressure & manual, Pressure only, Metron protractor and Manual Handwheel.

Part No

Actuator

Description of Operation

D10964

Manual & Pressure Actuator

This actuator is designed to be operated both manually and pneumatically. When operated manually, a safety clip has to be removed before the lever can be operated. When operated pneumatically, a pressure of at least 450 PSI (31 Bar) must be available to ensure correct actuation of the CO2 valve. Actuation ports are machined in both sides of the body to enable several actuators to be ‘daisy chained’. Once operated, a detent device ensures that the actuator remains in the fully open position. To reset the actuator, simply reset the lever to the closed position replace the safety clip and gently pull out the reset knob on the detent.

D10978

Single Slave
Actuator

This actuator is designed to be fired pneumatically only. When operated a pressure of at least 450 PSI (31 Bar) must be available to ensure correct actuation of the CO2 valve.

D10980

Metron Actuator

This actuator is designed to be fired electrically using a Metron Protractor device. When current is applied, the stem is protracted down thereby triggering the actuator. Once operated, a detent device ensures that the actuator remains in the fully open position. To reset the actuator, simply replace the Metron Protractor with a new unit and gently pull out the reset knob on the detent.

D10980/20

Metron Actuator
with Conduit Thread

This actuator is designed to be fired electrically using a Metron Protractor device. In addition to the D10980 a 20mm thread is machined onto the top of the body to enable connection to any standard electrical conduit. When current is applied, the stem is protracted down thereby triggering the actuator. Once operated, a detent device ensures that the actuator remains in the fully open position. To reset the actuator, simply replace the Metron Protractor with a new unit and gently pull out the reset knob on the detent.

D11003

Double Slave
Actuator

This actuator is designed to be fired pneumatically only.When operated a pressure of at least 450 PSI (31 Bar) must be available to ensure correct actuation of the CO2 valve. Actuation ports are machined in both sides of the body to enable several actuators to be ‘daisy chained’. Once operated, a detent device ensures that the actuator remains in the fully open position. To reset the actuator, gently pull out the reset knob on the detent.

D11023

Double Slave
Metron Actuator

This actuator is designed to be fired pneumatically or electrically using a Metron Protractor. When pressure operated a pressure of at least 450 PSI (31 Bar) must be available to ensure correct actuation of the CO2 valve. Actuation ports are machined in both sides of the body to enable several actuators to be ‘daisy chained’. When fired electrically the stem is protracted down thereby triggering the actuator. Once operated either pneumatically or electrically , a detent device ensures that the actuator remains in the fully open position. To reset the actuator, gently pull out the reset knob on the detent. If fired electrically a new Metron Protractor will be required before the actuator can be reused.

D11039

Manual Handwheel Actuator

This actuator is designed for manual actuation of a single CO2 Valve. It can be used for testing & inspection purposes. To operate this actuator, simply turn the hand-wheel clockwise a few turns until the valve opens.

Basic Specifications

Actuator Ports

Actuator ports can be supplied with either 1/8” BSPT or 1/8” NPT threads. (NPT Ports are marked ‘N’, BSPT Ports are unmarked)

Metron Protractors

Metron protractors are not supplied with any of our Metron actuators.

DAB recommend only the following Metron protractors:

Leafield Engineering Co. Ltd. - Part No. C89-151-10A

Nobel Explosive Co. Ltd. - Part No. ICI-2014

Please refer to instructions supplied with the Metron for specifications.

NOTE: Metron Protractors are ‘one shot’ actuation devices and should be replaced immediately after use.

Pneumatic Actuators

A pressure of at least 450 PSI (31 Bar) should be available for actuation of pneumatic actuators, If actuators are ‘daisy chained’ a minimum pressure of 450 PSI (31 Bar) must be available at the last actuator in the chain.

 

Minimum

Maximum

Operating Temperature

-20 degrees C

+50 degrees C

Pressure Range for Pneumatic Actuators

31 BAR - 450 PSI

140 BAR - 2030 PSI

CO2 Accessories

General Information

These accessories are designed to be incorporated into any CO2 total flooding system.

Part No

Accessory

Description of Operation

D11096

Manifold Burst Disc Assembly

The Manifold Burst Disc Assembly is designed to be fitted in to the manifold to protect the system from any accidental overpressure. ie: Pressure build up in the manifold due to high temperature. When the burst pressure is achieved the Recoil Nozzle vents the built up gas safely to atmosphere. The manifold burst disc can be supplied with either a 3/8” BSPT or a ½” BSPT Male Thread. The burst disc is designed to burst at a pressure of 190 Bar.

D11056

Bleed Valve

The bleed valve is designed to prevent accidental initiation of the main system in the event of a slow build up of pressure into the pilot line caused by leakage from any actuation device. The valve, shown in the open position, allows pilot gas to pass to atmosphere thus preventing any rise in pressure in the pilot line. However, when the system is operated, the pilot pressure rises rapidly above the closing pressure and the valve closes thereby allowing actuation to take place immediately. After operation, when the system is bled, the valve will reset automatically. However, if there is no provision for bleeding, this can be achieved by simply pushing in the reset knob. The bleed valve is supplied with a ¼” NPT Female thread The valve is designed to shut fully at a pressure of 2 Bar - 30 PSI

D10992


1/2" Ball Check Valve

This valve is designed to fit between the manifold and the CO2 valve to stop any possible back pressure from occurring when the system is discharged. The ½” Ball Check can be supplied with either a ¾” BSPT or a ¾” NPT male thread. The NPT Thread is identified by a series of notches machined in the hexagon portion of the valve body. On the other end of the ball check a CO2 thread is machined to take any standard CO2 connector.

D11101

½” Ball Check Valve with Pilot Line Tapping

This valve is designed to fit between the manifold and the CO2 valve to stop any possible back pressure from occurring when the system is discharged. In addition this valve has a threaded port to enable cylinder pressure to be used to operate any other CO2 Equipment. The ½” Ball Check can be supplied with either a ¾” BSPT or a ¾” NPT male thread. The NPT Thread is identified by a series of notches machined in the hexagon portion of the valve body. On the other end of the ball check a CO2 thread is machined to take any standard CO2 connector. The pilot line thread is machined in the side of the body to accept any standard 3/16” Enots pipefitting.

Basic Specifications

Minimum

Maximum

Operating Temperature

-20 degrees C

+50 degrees C

Pressure Range - Manifold Burst Disc

0 BAR - 0 PSI

190 BAR - 2755 PSI

Pressure Range - Bleed Valve

Open below 1 ½ Bar-22 PSI
Closed above 2 Bar –30 PSI

140 Bar - 2030 PSI

Pressure Range - Ball Check & Ball Check with Pilot line Tapping

A minimum of 31 Bar - 450 PSI must be available at the ball check pilot line in order for it to be used for the actuation of other devices.

140 Bar - 2030 PSI
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Carbon Dioxide (CO2) System Applications

Carbon dioxide extinguishing agent used in engineered systems is particularly useful for hazards where an electrical, nonconductive medium is essential or desirable; where clean-up of other agents presents a problem; or where the hazard obstructions require the use of a gaseous agent.

The following are typical hazards protected by carbon dioxide systems:
  • Printing presses
  • Vaults
  • Open pits
  • Dip tanks
  • Spray booths
  • Ovens
  • Engine rooms
  • Coating machines
  • Process equipment
  • Hoods and ducts
  • Flammable gas or liquid storage areas

Properties of Carbon Dioxide

The following are the properties of the agent:

  • Chemical formula CO2
  • Molecular weight 44.011
  • Normal sublimation temperature at atmospheric pressure, (°F) –109.21
  • Triple point temperature (at 75.35 psia) (°F) –69.88
  • Critical temperature, (°F) 87.87
  • Critical pressure, (psia) 1069.96
  • Critical density, (lb. per cu. ft.) 29.21
  • Density of liquid at 86 °F, (lb. per cu. ft.) 37.3
  • Specific volume of saturated vapour at 5 °F (cu. ft. per lb.) 0.266
  • Specific heat of liquid at 86°F, (btu per lb. °F) 2.5
  • Specific heat ratio (cp/cv) of vapour at 86 °F and one atmosphere pressure 1.3
  • Thermal conductivity, (btu ft. per sq. ft. hr. °F):
  • Saturated liquid, at 5 °F 0.067
  • Saturated liquid, at 86 °F 0.041
  • Vapour, at saturation pressure at 5 °F 0.0139
  • Vapour, at one atmosphere pressure at 86 °F 0.0169
  • Viscosity

(Centipoises):

  • Saturated liquid at 5 °F 0.13
  • Saturated liquid at 86 °F 0.065
  • Vapour at saturation pressure at 5 °F 0.013
  • Vapour at one atmosphere pressure at 86 °F 0.015
  • Relative dielectric strength of vapour at ambient temperature and one atmosphere pressure (Nitrogen = 1) 0.88
  • Colour Clear and water white
  • Flammability Non-flammable
  • Toxicity, Underwriters
  • Laboratories classification Group 5a

Quality criteria for initial and recharge are as follows:

  • The vapour phase shall not be less than 99.5% carbon dioxide with no detectable odour.
  • The water content of the liquid phase shall not be more than 0.01% by weight (–30 °F dew point).
  • Oil content shall not be more than ten parts per million by weight.
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