Sun. Jun 20th, 2021

City gas distribution

Transporting future fuel

#31 Some FAQ on CGD

2 min read

A) Pressure level at different locations:

  1. Transmission Pipeline: maximum pressure 90-98 bar
  2. Sub-transmission pipeline: maximum pressure 90-98 bar
  3. Steel mains line: 19 to 49 bar
  4. Downstream of DRS: 4 to 7 bar
  5. Downstream of service regulator: 121 mbar
  6. Downstream of meter regulator: 21 mbar

B) 1 BTU = heat required to raise 1 lb of water by 1 deg.F = heat required to raise 453 gm of water by 5/9 deg.C = 453*(5/9) Cal.heat = 251.66 Cal = 0.252 KCal

1 BTU = 0.252 Kcal

1 MMBTU = 0.252 million Kcal

If natural gas has a CV of 10000 Kcal/scm then gas volume = 0.252*1000000/10000 = 25.2 scm

If natural gas has a CV of 9000 Kcal/scm then gas volume = 0.252*1000000/9000= 28 scm

C) Some Abbreviations

  1. ANSI American National Standard Institute
  2. ASME American Society of Mechanical Engineers
  3. API American Petroleum Institute
  4. APM Administered Pricing Mechanism
  5. BIS Bureau of Indian Standard
  6. CBM Coal Bed Methane
  7. CCOE Chief Controller of Explosives
  8. CFO Chief Financial Officer
  9. CGD City Gas Distribution
  10. CGS City Gas Station
  11. CNG Compressed Natural Gas
  12. DMP Disaster Management Plan
  13. CP Cathodic Protection
  14. DRS District Regulating Station
  15. EPCA Environmental Pollution Control Authority
  16. ERDMP Emergency Response and Disaster Management Plan
  17. GA Geographical Area
  18. GCV Gross Calorific Valve
  19. GTA Gas Transportation Agreement
  20. HSE Health Safety & Environment
  21. IMS Integrity Management System
  22. LCV Light Commercial Vehicle
  23. LNG Liquified Natural gas
  24. LPG Liquified Petroleum gas
  25. MDPE Medium Density Poly Ethylene
  26. NACE National Association of Corrosion Engineers
  27. NGV Natural Gas Vehicle
  28. OEM Original Equipment Manufacturers
  29. PESO Petroleum Explosive and Storage Organization
  30. PNGRB Petroleum and Natural Gas Regulatory Board
  31. PVC Poly Vinyl Chloride
  32. RLNG Regasified Liquified Natural Gas
  33. SCMD Standard cubic meter per day
  34. SCMH Standard cubic meter per hour
  35. SMC Standard Meter cubic
  36. STPL Sub Transmission Pipeline
  37. T4S Technical Standards Specifications including Safety Standards
  38. TCP Temporary Cathodic Protection

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