Sun. Jun 20th, 2021

City gas distribution

Transporting future fuel

#39 Fire prevention system in CGD

3 min read

The following equipment is being used to prevent fire in CGD;

A) Major Inbuilt Safety System at CNG Station

Compressors

  1. Safety valves
  2. Flame and Gas detectors
  3. Door interlocks,
  4. Over and under pressure protection
  5. CO2 flooding system
  6. Acoustic enclosure
  7. Independent double earthing
  8. Emergency shutdown switch outside the compressor package and also at a remote location.
  9. Machine guarding
  10. Hooters for compressor alarms

Cascades

  1. Safety discs
  2. Design safety
  3. Earthing
  4. Cut-off valves
  5. Common vent
  6. Sturdy steel structure frame for cylinders
  7. The canopy over the cascades.

Pressure Piping

  1. Designed at 1.4 times the Maximum Allowable Operating Pressure (MAOP)
  2. Cut off valves
  3. Station piping & tubing as per the international standards

LCV Filling

  1. Earthing
  2. Emergency cut-off
  3. Break-away coupling
  4. Stopper blocks for preventing the rolling of vehicles
  5. Pressure gauges.

Dispensers

  1. Earthing
  2. Pressure cut-off
  3. Vent terminating at 3-meter height for safe venting
  4. Break-away coupling
  5. Braided flexible hose for CNG filling
  6. Independent Draining system.

Other Facilities in the CNG station

  1. Flameproof electrical fittings within the boundary limit
  2. Insulating rubber mats in electrical panel room
  3. Separate earth pits for electrical and electronic equipment network
  4. Lightning arrestor with the independent earthing system.

B) Major Inbuilt Safety System in PNG Installations

Steel/MDPE Pipeline: The steel and PE Pipelines are laid as per PNGRB (T4S) Regulation with inbuilt and operational safety features. The Safety features are as given below.


Steel Pipeline

  1. The entire pipeline is cathodically protected through a well-engineered Cathodic Protection System.
  2. The pipeline is externally coated and coating materials for buried pipeline sections are of high integrity and proven material.
  3. Pipeline marking is an extremely important safety aspect and is essential to prevent unauthorized access to the pipeline and its hazards by members of the general public.
  4. Marking out the entire pipeline route will include:
    − Concrete markers
    − Boundary markers
    − Warning mats
  5. Coating over the pipeline against external corrosion.
  6. The pipeline is laid 1 meter below Ground level.
  7. The warning tape is laid above 250mm of Pipeline.
  8. Emergency contact nos. are displayed on the warning tape
  9. Above ground Pipelines Markers with contact nos. installed.
  10. Isolation valves in well accessible pits at every 3 Kms or at the branch.

MDPE Pipeline

  1. Lay at least 1 meter below ground level.
  2. Warning tape with emergency contact nos. above 250mm of Pipeline.
  3. Above ground Pipelines markers with emergency contact nos.
  4. Isolation valves in well accessible pits at every 1 km or at the branch.
  5. Transition fittings at exits for the riser to avoid the laying of PE pipeline above ground.

DRS/ MRS

  1. Design safety
  2. Active, monitor combination with 50 % redundancy with stream discrimination arrangement with slam shut off valve for over & under pressure protection.
  3. PSVs provided for each stream with safe vent
  4. Enclosure with lock for security
  5. Filters & differential pressure gauges provided
  6. Earthing provided and to be maintained

Meters at consumer installations

  1. Filters provided for large commercial consumers
  2. Pressure regulation as per consumer requirements
  3. Earthing provided and maintained

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