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Published Date

October 1997


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Ship/Shore Interface Safe Working Practice for LPG and Liquefied Chemical Gas Cargoes (IP no.16)

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This title aims to improve safety at the ship/shore interface. Composed of three parts, it considers cargo transfer operations and the processes involved within the ship/shore interface to ensure cargo transfer is carried out safely and reliably.

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Part I of this paper pays attention to purging loading arm procedures, e.g. purging before disconnection. Material was obtained by using port information/regulation documents and asking ship operators what practices are acceptable. It emphasises that certain products require special treatment and indicates the quantitative and qualitative measurements required to ensure safe cargo transfer. This part of the paper explains that LPG operations are “procedures orientated”. The assumption is made that the correct application of identified methods cannot cause unsafe conditions.

 

Part II looks at equipment and considers the desirable features at the ship/shore interface. The advantages of installing Emergency Shut Down (ESD) equipment are listed, and it is recommended that fixed gas sensors are used as alarm monitors.

 

Part III proposes that the application of risk assessment is used as a way of improving understanding at the ship/shore interface, providing safe operations.

In this paper the dilemma that faces operators of older terminals with regard to safe distances is discussed. It is stressed that the attitudes to safe distances are continually changing. Work that began twenty years ago has increased the understanding of cloud dispersion, improving the precision of predictions that reduce conservative margins. More importantly, risk analysis has developed as a science. This allows personnel to work safely in hazardous areas as the occurrence of accidents continues to fall. This paper suggests several simple measures to protect operatives.

 

This paper considers not only cargo transfer operations but also the processes centred on the ship/shore interface to ensure that cargo transfer is safely and reliably carried out.

PART I – SAFE WORKING PRACTICE AT THE SHIP/SHORE INTERFACE WITH PARTICULAR REFERENCE TO PURGING OF LOADING ARMS

1. PREAMBLE

2. BACKGROUND

3. LOADING ARMS – GENERAL REQUIREMENTS

4. LOADING ARMS FOR LPG AND LIQUEFIED CHEMICAL GASES

4.1 SHIP/SHORE INFORMATION EXCHANGE

4.2 INSTRUMENT CHECKS DURING LOADING AND DISCHARGING

4.3 OTHER INSTRUMENT CHECKS MADE AT AND ADJACENT

TO LPG/LIQUEFIED CHEMICAL GAS SHORE MANIFOLDS

5. COMMENTARY ON COMPARISON OF PURGING SYSTEMS

PART II – DESIRABLE FEATURES

1. ESD ARRANGEMENTS

2. GAS SENSORS

PART III – RISK ASSESSMENT IN SUPPORT OF SAFE WORKING PRACTICE

1. ASSESSING THE HAZARDS

1.1 CONCENTRATIONS OF RELEASED MATERIAL IN DENSE GAS CLOUDS

1.2 SPILL AND CLOUD EFFECTS

2. THE OUTCOME OF HAZARD ANALYSIS

2.1 EFFECT DISTANCES FROM THE ROTTERDAM STUDY

3. SIGTTO’S GUIDELINES FOR HAZARD ANALYSIS AS AN AID TO

MANAGEMENT OF SAFE OPERATIONS

4. MANAGEMENT ROLE

RECOMMENDED READING

APPENDIX 1 ARM CROSSOVER CONNECTION

SHIP INFORMATION QUESTIONNAIRE

MANIFOLD CONFIGURATION

APPENDIX 2 SAFETY REQUIREMENTS’ LETTER AND SHIP/SHORE SAFETY CHECK LIST

APPENDIX 3 DESCRIPTION OF THE HGSYSTEM FOR GAS CLOUD DISPERSION ASSESSMENT

APPENDIX 4 THE FAR FIELD EFFECTS OF NEUTRAL AND BUOYANT GASES

The scope of this information paper extents to consider not only the actual cargo transfer operations but the processes which centre upon the ship/shore interface and which ensure that cargo transfer is safely and reliably performed.

The purpose of SIGTTO is to promote shipping and terminal operations for liquefied gases which are safe, environmentally responsible and reliable. To fulfil this mission it will:

  • Proactively develop best operating practices and guideline

  • Sustain a learning environment by sharing lessons learned

  • Promote training and development of all within the industry

  • Foster mutually beneficial relationships with regulatory authorities and other stakeholders

  • Conduct its business with professionalism and integrity

Title: Ship/Shore Interface Safe Working Practice for LPG and Liquefied Chemical Gas Cargoes (IP no.16)
Number of Pages: 44
Product Code: 4400W058
ISBN: ISBN 13: 978-1-85609-143-5 (9781856091435), ISBN 10: 1-85609-143-0 (1856091430)
Published Date: October 1997
Binding Format: Paperback
Book Height: 210 mm
Book Width: 300 mm
Book Spine: 5 mm
Weight: 0.30 kg
Author: SIGTTO

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