1. Introduction

2. Gas Supply in Hong Kong

3. System Components

4. Design Considerations

5. Gas Pipe Sizing

• Gas Street Lamps (Duddell Street, Central, HK) (4:46) http://www.youtube.com/watch?v=ZJO99leDtwM
• 地下秩序：地下氣息 (21:21) https://youtu.be/z3twoheZOUo
  

• EMSD, 2012. Code of Practice GU 21 Requirements for Town Gas Installations for Catering Purposes in Restaurants and Food Preparation Establishments, Gas Authority, Electrical and Mechanical Services Department, Hong Kong. https://www.emsd.gov.hk/en/gas_safety/publications/codes_of_practice/
• Gas Safety Portal (EMSD) https://www.emsd.gov.hk/gsp/en/
• Overview on Gas Safety https://www.emsd.gov.hk/gsp/en/b01.html
• Gas Installation Work and Registered Gas Contractors https://www.emsd.gov.hk/gsp/en/b04.html

• Gas Authority Hong Kong, 2018. Code of Practice: Avoidance of Damage to Gas Pipes, 2nd Edition, Gas Authority, the Government of the Hong Kong Special Administrative Region, Hong Kong. https://www.emsd.gov.hk/en/gas_safety/publications/codes_of_practice/
  
• Hall F. and Greeno R., 2017. Building Services Handbook, 9th ed., Chapter 10, Routledge, Oxford, UK. [HKALL]
• IGEM, 2013. Defining the End of the Network, a Meter Installation and Installation Pipework, IGEM/G/1 Edition 2, Communication 1765, Institution of Gas Engineers and Managers (IGEM), Derbyshire, UK. https://www.igem.org.uk/_resources/assets/attachment/full/0/15081.pdf
  
• IGEM, 2012. Definitions for the Gas Industry, IGEM/G/4 Edition 2, Communication 1763, Institution of Gas Engineers and Managers (IGEM), Derbyshire, UK. https://www.igem.org.uk/technical-services/technical-gas-standards/general/igem-g-4-edition-2-definitions-for-the-gas-industry/

• The History of Gas (National Gas Museum) http://www.nationalgasmuseum.org.uk/the-history-of-gas/
• The Gas Explosion in Hong Kong (11 Apr 2006, at Ngau Tau Kok) http://zonaeuropa.com/20060412_1.htm
  
• Hong Kong, Ngau Tau Kok underground towngas explosion (CableTV news) (YouTube) (7:45) http://www.youtube.com/watch?v=ba5M3Lw9SMU
• 2014 Kaohsiung gas explosion http://en.wikipedia.org/wiki/2014_Kaohsiung_gas_explosions
• Registered Gas Supply Companies List https://www.emsd.gov.hk/en/gas_safety/registers/registered_gas_supply_companies_list/
  
• Gas Safety (EMSD) https://www.emsd.gov.hk/en/gas_safety/
  
• Codes of Practice by Gas Standards Office https://www.emsd.gov.hk/en/gas_safety/publications/codes_of_practice/
  
• Gas Safety Ordinance (Cap. 51)
  
• Gas Safety Tips to Users http://www.emsd.gov.hk/en/gas_safety/gas_safety_tips_to_users/
  
• General https://www.emsd.gov.hk/en/gas_safety/publications/general/
  
• Guidance Notes https://www.emsd.gov.hk/en/gas_safety/publications/guidance_notes/ 
  
• Inspections and Maintenance of Service Risers and Installation Pipes http://www.emsd.gov.hk/en/gas_safety/gas_safety_tips_to_users/inspections_and_maintenance_of_service_risers/
  
• Registers http://www.emsd.gov.hk/en/gas_safety/registers/
  
• Types of Domestic Fuel Gases and Their Properties http://www.emsd.gov.hk/en/gas_safety/gas_safety_tips_to_users/types_of_domestic_fuel_gases_and_their_properties/
  
• Hong Kong and China Gas Company Limited http://www.hkcg.com/
  
• Towngas 1862-2012: Lighting the Past. Brightening the Future 煤氣150周年紀念特刊 https://www.towngas.com/getmedia/0768521f-bd6d-4c9e-8822-c31b14ac5e00/%E7%85%A4%E6%B0%A3150%E5%91%A8%E5%B9%B4%E7%B4%80%E5%BF%B5%E7%89%B9%E5%88%8A.pdf.aspx?ext=.pdf
  
• The Hongkong and China Gas Company Ltd / Towngas – 150th Anniversary 2012 – superb photographs http://industrialhistoryhk.org/hongkong-china-gas-company-towngas-150th-anniversary-2012-superb-photographs/
  
• The Hongkong and China Gas Company Ltd – early history from 1860s http://industrialhistoryhk.org/hongkong-china-gas-company-early-history-1860s/
  
• The Hongkong and China Gas Company Ltd – explosion 14th May 1934, 42 killed http://industrialhistoryhk.org/the-hongkong-and-china-gas-company-ltd-explosion-14th-may-1934-42-killed/
  
• Institution of Gas Engineers & Managers (IGEM), UK http://www.igem.org.uk/
• LPG - Wikipedia http://en.wikipedia.org/wiki/Liquefied_petroleum_gas