Appendix 5: Representative Tables of Contents for Oil, Chemical, or Liquefied Gas Risk Analysis - TERMPOL Review Process 2001 | TP 743

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APPENDIX 5

Representative Tables of Contents of Oil, Chemical, or Liquefied Gas Risk Analysis

Table 1: Representative Table of Contents for an Oil Risk Analysis

Section 1:	Introduction
Section 2:	Project and Site Description
	2.1 Project Overview
	2.2 Population or Community Distribution Along Oil Carrier Route
	2.3 Relevant Climatic / Environmental Considerations
Section 3:	Oil Design Ship Safety Features
	3.1 Hull and Cargo Tank Components
	3.2 Navigational Equipment (early warning of potential collision or grounding situations)
	3.3 Fire Prevention and Fire Fighting
	3.4 Oil Carrier’s Vulnerability to Shipboard Accidents
Section 4:	Oil Trajectory Dispersion Model
	4.1 Oil Trajectory Dimensions for Worst Case Credible Scenario
Section 5:	Marine Shipping Network Analysis
	5.1 Composite Oil Carrier Interface with Existing Shipping Patterns and Densities (Annual Basis)
	5.2 Oil Carrier Coastal Route Analysis
	5.3 Accident Statistics and Probability of Future Accidents
	5.4 Accident Potential Along Oil Carrier Route
	5.5 Accident Scenarios
	5.6 Affect on Public Safety (Consequences of a Major Accident)
Section 6:	Terminal Facilities Safety Analysis
	6.1 Analytical Approach
	6.2 Consequences of Minor Cargo Transfer Accidents at the Oil Carrier Terminal
Section 7:	Mitigation and Amelioration
	7.1 Shipping Risk Mitigation
	7.2 Terminal Risk Mitigation
	7.3 Fire Prevention, Protection and Control

Table 2: Representative Table of Contents for a Chemical Risk Analysis

Section 1:	Introduction
Section 2:	Project and Site Description
	2.1 Project Overview
	2.2 Population or Community Distribution Along Chemical Carrier Route
	2.3 Relevant Climatic / Environmental Considerations
Section 3:	Chemical Carrier Design Ship Safety Features
	3.1 Hull and Cargo Tank Components
	3.2 Navigational Equipment (early warning of potential collision or grounding situations)
	3.3 Fire Prevention and Fire Fighting
	3.4 Chemical Carrier’s Vulnerability to Shipboard Accidents 3.5 Cargo Tank Leak Sensors and Alarm Systems
Section 4:	Chemical Release Dispersion Model
	4.1 Chemical Release Dimensions for Worst Case Credible Scenario
Section 5:	Marine Shipping Network Analysis
	5.1 Composite Chemical Carrier Interface with Existing Shipping Patterns and Densities (Annual Basis)
	5.2 Chemical Carrier Coastal Route Analysis
	5.3 Accident Statistics and Probability of Future Accidents
	5.4 Accident Potential Along Chemical Carrier Route
	5.6 Accident Scenarios
	5.7 Affect on Public Safety (Consequences of a Major Accident)
Section 6:	Terminal Facilities Safety Analysis
	6.1 Analytical Approach
	6.2 Consequences of Minor Cargo Transfer Accidents at the Chemical Carrier Terminal
Section 7:	Mitigation and Amelioration
	7.1 Shipping Risk Mitigation
	7.2 Terminal Risk Mitigation
	7.3 Fire Prevention, Protection and Control

Table 3: Representative Table of Contents for a Liquefied Gas Risk Analysis

Section 1:	Introduction
Section 2:	Project and Site Description
	2.1 Project Overview
	2.2 Population or Community Distribution Along Liquefied Gas Carrier Route
	2.3 Relevant Climatic / Environmental Considerations
Section 3:	Liquefied Gas Design Ship Safety Features
	3.1 Hull and Cargo Tank Components
	3.2 Navigational Equipment (early warning of potential collision or grounding situations)
	3.3 Fire Prevention and Fire Fighting
	3.4 Liquefied Gas Carrier’s Vulnerability to Shipboard Accidents 3.5 Cargo Tank Leak Sensors and Alarm Systems
Section 4:	Gas Plume Dispersion Model
	4.1 Gas Plume Dimensions for Worst Case Credible Scenario (See Appendix 6: 4 for further details concerning LNG/LPG in particular)
Section 5:	Marine Shipping Network Analysis
	5.1 Composite Liquefied Gas Carrier Interface with Existing Shipping Patterns and Densities (Annual Basis)
	5.2 Liquefied Gas Carrier Coastal Route Analysis
	5.3 Accident Statistics and Probability of Future Accidents
	5.4 Accident Potential Along Liquefied Gas Carrier Route
	5.5 Accident Scenarios
	5.6 Affect on Public Safety (Consequences of a Major Accident)
Section 6:	Terminal Facilities Safety Analysis
	6.1 Analytical Approach
	6.2 Consequences of Minor Cargo Transfer Accidents at the Liquefied Gas Carrier Terminal
Section 7:	Mitigation and Amelioration
	7.1 Shipping Risk Mitigation
	7.2 Terminal Risk Mitigation
	7.3 Fire Prevention, Protection and Control

1 ADDITIONAL INFORMATION CONCERNING LNG/LPG RISK ANALYSIS

1.1 An incident involving LNG or LPG is normally followed by the natural production of a visible vapour cloud provided ignition does not occur immediately. The downwind travel of the vapour cloud and its crosswind dimensions may cover an area measured in hectares or square nautical miles. Atmospheric structures, prevailing wind velocity, quantity, rate and duration of the LNG or LPG release, water surface area surrounding the source of released LNG or LPG, are effective factors in predicting the dimensions (length, width, height) of LNG or LPG vapour clouds.

1.2 As an example, during LNG vaporisation, LNG (methane) initially expands its volume by a factor of about 250 and, as it warms to ambient temperature, it continues to expand to volumes about 600 times larger than its liquid volume. Initially, the cold methane vapour is denser than air and the vapour cloud hugs the earth’s surface until warming makes it lighter than air and it rises. LPG (propane or butane) remains denser than the ambient air and the vapour cloud hugs the earth’s surface even when warmed to ambient temperatures.

1.3 The major threat to a LNG or LPG generated vapour cloud is ignition when the gas-air ratios are within the respective upper and lower flammable limits (5% to 15% volume in air for methane, 2.4% to 9.5% volume in air for propane, and about 1.8% to 8.4% volume in air for butane). Other gases should be evaluated based on their own particular characteristics.

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