LNG Emergency Release Systems (eBook). Recommendations, Guidelines and Best Practices

Published Date

January 2017

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LNG Emergency Release Systems (eBook). Recommendations, Guidelines and Best Practices

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This guide sets out best practice for the operation and maintenance of LNG emergency release systems (ERS), with the aim of safeguarding personnel, the environment and property during LNG operations.

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Developed with the input of manufacturers, terminal operators and LNG shippers, this publication applies a risk-based approach covering the structure and operation of ERS. It sets out guidelines and best practices for ERS usage and also examines ERS hazards and risk management. The annexes provide competencies and training guides and suggested further reading.

1. Introduction and Scope
1.1 Introduction
1.2 Scope


2. Emergency Release Systems (ERS)
2.1 What is an ERS?
2.2 Evolution of MLA Safety Systems


3. Recommendations, Guidelines and Best Practices
3.1 General
3.2 ERS Lifecycle Considerations
3.3 Examples of Best Practice


4. Primary and Secondary Purposes
4.1 Primary Purpose
4.2 Secondary ERS Purposes


5. Risks
5.1 Incident Summary
5.2 Risks from Secondary Purposes
5.3 ERS Hazards and Risk Management


Annex A – Competencies and Training
Annex B – Suggested Further Reading

This document is provided to guide operators and maintainers of LNG Emergency Release Systems (ERS) to safeguard life, protection of the environment and property in that order.


ERS are common in modern LNG receiving and discharge terminals. Since the first simple quick connect/disconnect coupler (QC/DC) systems were installed in the 60s, the industry has progressed to today’s double ball valve and powered emergency release coupler (ERC) with position indication system and defined working envelopes. The ERS provides a positive means to protect the terminal from damage to the marine loading arms (MLAs) and to protect the LNG carrier (LNGC) from damage to its manifold and piping systems.


The guidance contained in this document has been developed with the input of manufacturers, terminal operators and LNG shippers. A risk based approach has been used in its the development and it is recommended that terminals and other users of ERS use it as a template to better understand their specific location issues.


The Society of International Gas Tanker and Terminal Operators (SIGTTO) is an international body established for the exchange of technical information and experience, between members of the industry, to enhance the safety and operational reliability of gas tankers and terminals. Learn more: https://www.sigtto.org/about-us/

Title: LNG Emergency Release Systems (eBook). Recommendations, Guidelines and Best Practices
Number of Volumes: 1
Number of Pages: 97
Product Code: WS1533EA
Published Date: January 2017
Author: SIGTTO

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