General extinguishing systems.
a. This Fire Suppression Systems will be U.L. listed or approved by a recognized laboratory using CO2.
b. Reference section 5.0 for buildings to be protected by CO2.
Fire Suppression Systems | CO2 Extinguishing Systems
Scope of Supply
The Seller shall provide everything necessary to design, supply, install and test a complete CO2 fire suppression system and supervised automatic fire detection and alarm system in accordance with all applicable NFPA requirements. All equipment, valves and other devices shall be U.L. listed and/or FM approved for use in CO2 systems. The control panel, detection system and the agent releasing system shall be U.L. listed for use with each other. All work performed shall be in accordance with NFPA Standards 12, 70, 72, and the attached specifications.
Fire Suppression Systems Description
a. The CO2 fire suppression system shall be engineered and designed for total flooding for the areas outlined on the fire protection drawings.
b. Sizing of the piping network shall be calculated per NFPA-12 and manufacturer’s guidelines. The CO2 system shall provide sufficient amount of extinguishing agent to saturate the immediate area with a minimum concentration (30 percent by volume) within 2 minutes of actuating the system, and also to achieve the design concentration (50 percent by volume) within 7 minutes. The concentration is to be maintained in the area for 10 minutes.
c. Consideration must be given to such factors as: un-enclosable openings, if any; run-down time of fans, time required for dampers, doors or windows to close, and cracks around doors, windows and walls.
d. The system shall be activated by a choice of any two (2) smoke detectors in alarm.
e. Activation of the first smoke detector shall:
(i) Energize pre-discharge horn(s) in the protected area.
(ii) Illuminate the “Alarm” LED on the control panel.
(iii) Illuminate an LED on the activated detector.
(iv) Annunciate an alarm condition to the FGCP.
f. Activation of a second smoke detector or UV/IR flame detector shall:
(i) Continue to operate alarm devices
(ii) Sound evacuation horn(s).
(iii) Shut down all air conditioning and ventilation systems and close all dampers to affected area (via HVAC control panel).
(iv) Shut down non-emergency electrical power to affected areas such as the Switchgear/MCC buildings, (via Plant Safety PLC).
(v) Activate an adjustable time delay that will delay the release of agent as required for up to thirty (30) seconds. The agent shall be released at the end of this time period unless a manual release station is pulled. If a manual release station is pulled the agent shall be released immediately by-passing any remaining time delay.
Fire Suppression System Components
The fire suppression system shall be manufactured by a well recognized professional firm specialized in this field and shall include a Main / Reserve system.
Agent
The fire suppression agent shall be CO2. Sufficient agent shall be supplied for two separate extinguishing efforts, i.e., two full charges. A minimum of two cylinders of extinguishing agent shall be required to fulfill this requirement. The agent supply shall be located inside as indicated on the fire protection drawings.
Agent Storage
a. The CO2 shall be stored in U.L. listed steel alloy containers.
b. Each container shall be equipped with suitable lifting attachments, discharge valve, safety relief device, and an anti-recoil device for shipping and handling.
c. A 24VDC, electric operated control head with local manual lever operation shall be required for automatic operation of the system.
d. Cylinders that utilize mechanically and/or solenoid operated valves are not acceptable.
e. Systems requiring three or more cylinders shall be complete with mounting frame assembly including weigh bar, cylinder straps and manifold pipe clamps.
f. Each container shall be secured in place mounted against the wall.
g. Cylinders shall have a service rating of 500 pounds per square inch gauge (psig) and a minimum burst pressure of 2000 psig.
h. Each cylinder shall have the name of the extinguishing agent CO2 clearly painted in white on the front and rear in letters at least 1 inch high.
i. Cylinders shall be painted manufactured red.
j. A weigh scale assembly shall be required for weighing cylinders semi-annually.
Fire Suppression System Discharge Heads
a. Discharge heads shall be mounted on top of the extinguishing agent cylinders and connected to an extinguishing agent manifold.
b. Discharge heads shall be capable of local, manual release of each charge. The manual release mechanism shall be an easily accessible lever assembly and clearly labeled. Labeling shall be written in letters a minimum of 1 inch high.
c. The discharge heads shall be capable of automatically releasing each charge by area fire detection.
d. Once activated, the entire charge shall be released.
Cylinder Manifold
a. The cylinder manifold shall interconnect all the extinguishing agent cylinders. Flexible piping shall be used between storage cylinders and the manifold. The flexible hose shall be the manufacturer’s standard, rubber coated with steel reinforcement.
b. The cylinder manifold shall provide for isolating the two extinguishing agent charges so that only one charge may be released at a time either automatically or manually.
c. The cylinder manifold shall provide a single flanged or threaded fitting for connection to piping between the cylinder manifold and the nozzles.
d. The cylinder manifold shall be hot-dipped galvanized Schedule 80 pipe.
e. The manifold shall be in accordance with manufacturer’s guidelines and the latest requirements in NFPA-12.
Discharge Piping
a. All distribution piping and fittings shall be in accordance with the manufacturer’s guidelines and the latest requirements listed in NFPA 12.
b. All piping and fittings shall be galvanized.
c. All reductions in pipe size must be made using concentric reducing fittings. Reducing bushings are not acceptable.
d. The piping system shall be securely supported in accordance with NFPA 12.
Nozzles
a. The extinguishing nozzle(s) shall be suitable for mounting in the area being protected by the CO2 fire protection system.
b. Nozzle(s) shall be of the low velocity, high volume type.
c. Nozzle(s) shall be designed to spray in a single plane with an angular coverage sufficient to cover the entire area protected.
d. Nozzle(s) shall be constructed of steel with a brass orifice.
e. The nozzle shall have an ½-inch National Pipe Thread (NPT) threaded port.
f. Dirt trap consisting of a tee with capped nipple to be installed at the end of each branch line.
Fire Suppression System Control Panel
a. The control panel power supply shall utilize plant power of 230 VAC at 50 hz. The power supply shall include a step-down transformer to provide the control unit 24 VDC power for normal operation. The CO2 panel shall operate on a central UPS provided by the OWNER, which shall supply the
extinguishing system under full supervision for 24 hours. Following the 24 hour period, the UPS system shall supply 100% of all alarm output functions for a minimum of 5 minutes.
b. The microprocessor based control panel shall be U.L. listed as a releasing panel suitable for use systems.
c. The control panel shall utilize Style B (Class “B”) wiring for the detection and release circuits.
d. The control panel shall utilize a transfer switch for main/reserve operation.
e. The control panel shall be equipped with a fully supervised container disable switch. Operation of this switch shall cause a trouble signal and shall prevent the discharge of CO2.
f. The control panel shall have cross zone, pre-discharge, manual release, time delay, abort, and shutdown logic as standard features. The panel shall have general alarm/trouble contacts, and main/reserve indication (for example pressure switches) to interface with the FGCP (via addressable input modules located adjacent to this panel).
Miscellaneous Requirements
a. The fire alarm and detection equipment shall be U.L. listed and manufactured by a well recognized professional firm specialized in this field.
b. The audio/visual devices shall consist of 24VDC pre-discharge/evacuation horn/strobes labeled “FIRE”.
c. The placement of all devices shall be as shown on the fire detection drawing(s).
d. Manual discharge stations shall be supplied as shown on the drawing(s).
e. Instructional signs shall be provided at all points of egress, manual discharge stations, and audio/visual devices.
f. All wires shall be identified at every termination point in accordance with NFPA 70, Article 760.
g. All low voltage control wiring shall be 18 gauge solid copper as a minimum for detection circuits and 14 gauge for audio and solenoid valves.
h. All fire alarm circuits from electrical devices shall be run in conduit back to the panel where the return wiring must be landed on separate terminals as required. Wiring runs shall be continuous, point to point, with no splicing between terminals.
i. The SELLER shall provide detailed panel wiring diagrams showing all internal wiring in full. All component terminals and all terminal blocks for external wiring connections shall be shown and identified.
j. All major equipment and devices shall be tagged and labeled in accordance with the Project procedure.
k. The fire protection installer shall include fees for engineering, installation, materials, functional electrical testing, all required permits, and an educational seminar for the Buyer.
Final Acceptance Test
a. The test shall demonstrate that the entire control system functions as intended. All circuits shall be tested. In addition, the supervision of each circuit shall be tested.
b. A full discharge test shall be performed on all systems. Full discharge of entire design quantity of CO2 through system piping to ensure that CO2 is discharged into the hazard and that the concentration is achieved and maintained in the period of time required by this Specification and all pressure operated devices function as intended.