What is Fire Alarm System ?

GENERAL INSTRUCTIONS FOR COMPLIANCE:

✓ Work permit as should be secured and instructions provided in the permit should be complied. 

Where instructions are not clear, clarification should be requested from the concerned Supervisior.Work should only be commenced after ensuring that proper work environment is created (ex: Authorizations are secured, Isolations are confirmed, and required mobilization is done).

✓ Access to Emergency evacuation and other emergency services such as medical and Fire protection shall be readily available and contact details are readily available concerned supervisor as well as contactor.

✓ Access to drinking water, toilet and other essential infrastructure for both company and contract personnel should be eensured

WORK INSTRUCTION PROCEDURE:

DETAILS OF HAZARD INVOLVED

a. Electric Shock

b. Noise Pollution

c. Exposure to High Pressure Fluid

d. Poor illumination

e. Injury due to improper handling

f. Exposure to Dust

g. Electrical Fire

h. Exposure to Heat

SAFETY PRECAUTION REQUIRED:

a. Ensure use of proper PPE’s.

b. Keep the fire extinguishers (CO2 gas/ DCP) ready within reachable limit for any exigency at the vicinity.

c. Ensure proper earthing.

d. Ensure proper illumination.

e. Use hand gloves while working with the system.

f. Use safety belt if working in heights.

g. Use dust mask & safety goggles while cleaning the panels.

h. Permit Type: Permit to Work Order

i. Permit Approving Authority: Shift in-charge (Main Control Room)

T&P INCLUDING SPECIAL ONES:

a. Multi meter

b. Line tester

c. Insulated cutting pliers

d. Screw driver & spanner set

e. Panel key

f. Allen key

g. Air blower

h. Heat gun

i. Cable termination details & FAP map schedule

4.3.4 SPARES & CONSUMABLES

a. Marking cloth

b. PVC Tape

WORK INSTRUCTION:

Maintenance of Fire Alarm Panel

The Fire alarm panel is EST3 type with IO500 series. Each module supports up to 250 intelligent devices and can be expanded to two loops. Each loop supports up to 125 detectors and up to 125 modules. Field devices are of signature series. The communication between Signature Series devices and their circuit controller is 100% digital format and use a “broadcast polling” format to improve system response time.

A. Check for panel cleanliness, clean the panel if required.

B. Check for proper earthing.

C. Check for 230V AC Supply healthiness.

D. Check for proper cable glanding, cable termination and cable healthiness.

E. Check for cards and modules healthiness.

F. Check for all loop cable voltages (18 to 24 V dc) and should not get continuity within cables (field cable).

Maintenance of Photoelectric and Multisensor Detector Cleaning and Testing:

The Photoelectric and Multisensor Detectors detect smoke, ion & heat .This detector is the restorable types, which means when it is activated and then remove it will restore to normal operation.

A. Notify Station personnel that the alarm system will be interrupted in the area of testing until predetermined time.

B. Check for device cleanliness, clean the device if required.

C. Check for correct cable termination & proper tightness in TBs.

D. Once any detector or input modules are removed or doing test, an alarm will generate in FAP & also an audible alarm will activate in the hooters of the same loop (or in pre assign hooters of different loops).

E. Every device in FAP loop is addressable, so any device which is on test, open or fault, generate an alarm.

F. Physically identify the location of that device and verify this location in the FAP (annunciation display).

G. If we doesn’t want that audible alarm will generate during testing then either we have to remove the 24V dc supply of hooters from FAP or press “alarm silence” button in FAP or hooters each time.

H. To remove the detector from the base, firmly grip the base and rotate the detector head while slightly pushing a pin on detector. Then rotate the detector and will come loose when in position.

I. Take the detectors to the shop. Disconnect the shroud that covers the detector head. Use the compressed air to remove any dust or particles from the detector and its shroud. Beware not to use full air due to the sensitivity of the device.

J. Make sure that the detectors that have been cleaned are covered or protected from dust when cleaning the other detectors.

K. After cleaning of detectors replace each one by reversing the removal procedure.

L. Now, normalize the FAP cable connection & setting (if done any).

M. When we finished with the cleaning or any work being performed on the system, return to the FA panel. Check to make sure that no zones are indicating an "alarm' or trouble condition.

N. If the system does not reset, check the polarity of the terminals on the detector or the zone module terminals. The module will automatically go into alarm when you connect the wires to the terminals if the polarity is incorrect.

O. At end notify the Station personnel that the system is on line and the work is complete so that an announcement can be made to alert the fire response.

 Maintenance of Thermal Heat Detectors Cleaning and Testing:

The thermal heat detectors come in a rating of 135° F (57° C) temperature. This is rate of rise, which means they will alarm if the rate of the heat rises at more than 15 degrees per minute. This detector is the restorable types, which means when we activate them by using a heat gun and then remove the heat they will restore to normal operation.

A. To begin work follow steps 1 - 8 of Main Step 3 (Maintenance of Photoelectric Detector).

B. The locations for the thermal detectors are anywhere there will be a heart condition already presents. Locate the zone that you will be working on by using the maps of the station.

C. Cleaning can be done using a damp rag and wipe the detector clean of any dust or particle accumulation.

D. Using the heat gun, direct heat at the detector until the detector goes into alarm. Make sure not to put the heat gun too close to the detector. These detectors are the resetting types.

E. After the detector has been activated, return to the panel to determine the correct location and confirm alarm.

F. The detector will reset itself after it begins to cool down. Proceed to the next detector.

G. When we are finished with the testing and cleaning return to the panel and follow the procedures for bringing the system back online.

H. If the system does not reset, check the polarity of the terminals on the detector or the zone module terminals. The module will automatically go into alarm when you connect the wires to the terminals if the polarity is incorrect.

I. At end notify the Station personnel that the system is on line and the work is complete so that an announcement can be made to alert the fire response.

Maintenance of Infra-red Detectors Cleaning and Testing:

The thermal Infra-red Detectors work in principle of Black body radiation install for detecting moving fire in coal conveyer belt. These detectors are mounted in adjustable bracket permitting movement in both horizontal and vertical direction. Additional 220V ac supply Air purging unit is provided to automatically clean detectors from coal dust. Whenever a unit requires service, please contact the manufacturer or its authorized distributor for assistance.

A. Take PTW from Main CCR & CHP control room.

B. To begin work follow steps 1 - 7 of Main Step 3 (Maintenance of Photoelectric Detector).

C. Check for EOL Resistance connection at end of the loop if not then connect it.

D. Check for misalignment of the detector if any then correct it.

E. Insure that fire sensing zone is in the range of IR detector.

F. Check power supply (loop voltage 24 V dc) for correct voltage, polarity and wiring.

G. Check detector window and reflector for cleanness, if necessary clean the window.

H. Disconnect the power supply from the system and check the detectors internal wiring.

I. Re-connect powers supply and wait approximately one minute. Repeat the test. If any indication LED is still blinking, the unit is faulty and requires to be removed and to be submitted for repair.

J. Do same thing for air purging unit also & check for auto operation (on & off) of it.

K. At end notify the Station personnel that the system is on line and the work is complete so that an announcement can be made to alert the fire response.

Maintenance of Aragonite System Cleaning and Testing:

The Aragonite system is provided in Central Control Building of Units

Aragonite is a mixture of Argon and Nitrogen (both Inert gases) in a ratio of 50: 50 by volume which when released in an enclosure decreases the concentration of oxygen a level which is not enough for fire to continue and thus extinguishes fire in the enclosure where the aragonite is flooded. Whenever a unit requires service, please contact the manufacturer or its authorized distributor for assistance.

A. Notify Station personnel that the aragonite system will be interrupted in the area of testing until predetermined time.

B. Visually check that all cylinder pressure gauges are reading the correct pressure as stated on the cylinder label. If the cylinder gauge indicates a pressure less than 190 bar at 21.1°C, the cylinder must be recharged.

C. Check that the cylinder valve(s) are in the closed and sealed position.

D. Examine all hoses for signs of damage or wear, replace if suspect. Additionally, all hoses must be hydrostatically tested every 5 years.

E. All pipework and nozzles should be visually inspected for any signs of damage, deterioration or obstruction.

F. Nozzles should be checked for any signs of blockage and cleaned if appropriate. Any paint or lacquer shall be removed.

G. At least every twelve months, the protected room shall be thoroughly inspected to determine if changes to the volume, penetrations or leakages have occurred that could adversely affect the extinguishing performance of the system.

H. All cylinders must be pressure tested and recertified as required by the authorities having jurisdiction.

I. Detection, actuation and control system component should be checked.

J. Automatic and Manual release and inhibitor JB wiring and system healthiness should be check.

K. After completing all the jobs notify the Station personnel that the system is on line and the work is complete.

CHECKS BEFORE RELEASE OF PERMIT:

a. All T & P’s and manpower are removed.

b. Clean the maintenance area properly.

c. Normalize all isolation & Return PTW.

HANDLING OF CONCESSIONS OR DEVIATIONS:

a. In the Event of Any Changes or Deviation from Procedure are required due to Urgent business requirements or system/Equipment approval should be obtained from Head O&M.

b. The report for the concerned task should clearly Captured the details of deviations and reason for the same.