SECTION 15360

CARBON DIOXIDE EXTINGUISHING SYSTEMS

1. CO₂ Agent:

1. A clean, dry, non-corrosive, non-damaging, non-deteriorating chemical meeting the requirements outlined in Section 1-9.2 of NFPA Standard No. 12.

2. Cylinder:

1. Constructed, tested and marked in accordance with all applicable Department of Transportation (DOT) specifications for 3AA seamless steel cylinders.

3. Cylinder Assembly:

1. Seamless steel construction with a red enamel or epoxy finish available in 50 lb., 75 lb. and 100 lb. sizes and equipped with pressure differential type Fike discharge valve.
2. Valve constructed of brass and anodized aluminum capable of withstanding a maximum pressure of 6,000 psi.
3. Valve to accommodate a "straight-through" discharge without any directional changes for maximum discharge efficiency.
4. Valve to contain a safety pressure relief device that provides relief at 2,650 to 3,000 psi (18,269 to 20,682 kPa).
5. Cylinder charging pressure to be a minimum of 850 psi at 70° F (5,861 kPa at 21° C) with a filling density of not more than 68% of its water capacity.
6. Cylinder shipped with maintenance record card and shipping cap attached.
7. Cylinder serial number, full and empty weight capacities and part number recorded on a cylinder identification label attached to the cylinder.

4. Solenoid Actuator:

1. Electrical actuation of agent cylinder to be accomplished by an electric solenoid actuator interfaced

through a compatible control panel by the system manufacturer.

2. The actuator must be capable of being used in [hazardous] [non-hazardous] environments where ambient temperature range is between 32° F and 130° F (0° C and 54° C).
3. The actuator shall not require a special rearming tool to reset the actuator after operation.

5. Manual Actuator:

1. Manual actuation of the system shall be accomplished by pulling the hand lever on the actuator. A manual actuator must be provided when the solenoid actuator does not include a manual operator.

6. Cylinder Straps and Racking:

1. Cylinder straps shall be supplied for all single cylinder systems as a minimum. Straps may be used on any number of cylinders.
2. Cylinder racking shall be supplied for multiple cylinder systems. Racking shall be available in single row, double row and back-to-back arrangements.
3. Provisions for weighing the cylinders in place shall be made available as an option for all racking configurations.

7. Check Valves:

1. Check valves shall be provided on all systems utilizing a connected reserve supply. This prevents the reserve bank of cylinders from being activated when the main bank discharges.
2. The check valve shall be constructed of [brass] [stainless steel] and capable of withstanding pressures of up to 5,000 psi.
3. The check valve shall be of an "inline flow" design for minimal flow restriction during discharge.

8. Stop/Maintenance Valve:

1. A Stop/Maintenance Valve shall be included on each system to provide a manual shut-off means for the system during maintenance operations. The Stop/Maintenance Valve will prevent the discharge of CO₂ from the nozzles, thus providing fail-safe protection for the service technician.
2. Stop Valves shall be constructed of stainless steel and be capable of withstanding pressures of up to 5,000 psi.
3. Valve shall have a U.L. listed limit switch as part of the assembly to annunciate a trouble signal to the control panels whenever the valve is closed.
4. Valve handle shall be lockable in either the open or closed positions for security purposes.

9. Nozzles:

1. Designed to direct the discharge of carbon dioxide in a liquid or gaseous state.
2. Orifice size to be determined by a computerized hydraulic calculation based on flow rate and the system design requirements.
3. Nozzles to be constructed of natural brass or zinc plated aluminum for maximum corrosion resistance.
4. Nozzles to be equipped with flange mounting kits and sealing discs where necessary.

10. Distribution Piping:

1. Piping to meet the requirements of ASTM [A53] [A106] specifications.
2. Distribution lines up to ¾ in. diameter shall be Schedule 40 seamless steel [black] [galvanized] pipe.
3. Distribution lines larger than ¾ in. diameter shall be Schedule 80 seamless steel [black] [galvanized] pipe.
4. For pipe sizes up to 2 in. diameter, Class 300 [malleable] [ductile] iron fittings shall be used. For pipe larger than 2 in. diameter, IPS and forged steel fittings shall be used.