LNG Operational Practice.  2nd Edition (eBook)

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Published Date

January 2020

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LNG Operational Practice. 2nd Edition (eBook)

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This second edition has been updated to reflect the substantial changes and new designs in the technical and operational aspects of LNG shipping and the transportation of LNG by sea since this book was first published in 2006. It is prepared as a practical handbook for the operation of LNG carriers, setting out guidance on onboard processes in a logical sequence, with an insight to the underlying chemistry.

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This book is written for LNG Officers who require a better understanding of the mechanics and processes involved in operating a modern LNG carrier. The book is laid out with clear diagrams, checklists, guidance and instructions for each of the operations undertaken at each stage of a typical trading cycle for an LNG carrier including: post dry dock, drying of cargo tanks, inerting of cargo tanks, gassing-up the cargo tanks, initial cooldown of cargo tanks, cargo loading, laden voyage, cargo discharge, ballast voyage, ship to ship transfer and preparations for dry dock including warming-up of cargo tanks, inerting of cargo tanks and aeration of cargo tanks.



Section 1: General Information

1     Physical Properties, Composition and Characteristics of LNG

       1.1    Overview

       1.2    Flammability of LNG

       1.3    Saturated Vapour Pressure (SVP)

       1.4    Vapour Density

       1.5    Safety Precautions in LNG Handling

2     Normal Trading Cycle of an LNGC

3     Cargo Containment Systems

       3.1    Overview

       3.2    Moss Rosenberg (Moss)

       3.3    Mark III (GTT

       3.4    NO96 (GTT)

4     Cargo Handling Equipment

       4.1    Cargo Pump

       4.2    Spray/Stripping Pump

       4.3    High Duty Compressor

       4.4    Low Duty Compressor

       4.5    Gas Heater

       4.6    Vaporiser

       4.7    Reliquefaction Plant

       4.8    Gas Combustion Unit (GCU)

5     Auxiliary Equipment

       5.1    The Cargo Valves Remote Control System

       5.2    Ship/Shore Link and ESD System

       5.3    N2 Generator

       5.4    IG Plant

       5.5    Custody Transfer and Measurement System (CTMS)

       5.6    Cargo Tank Gauging System

       5.7    Gas Detection Equipment

       5.8    Cofferdam Heating System

       5.9    Vacuum Pumps

       5.10  Tank Overflow Protection

Section 2: Post Dry-dock Operations

6     Operations Related to Auxiliary Systems

       6.1    Moss Type LNG Carriers

       6.2    Membrane Type LNG Carriers (Mark III and NO96)

7     Cargo Tank Operations

       7.1    Drying of Cargo Tanks

       7.2    Inerting of Cargo Tanks

       7.3    Gassing-up the Cargo Tanks

       7.4    Initial Cooldown of Cargo Tanks

Section 3: In-service Operations

8     Loading Operations

       8.1    Overview

       8.2    Preparation for Loading

       8.3    Pre-loading Operations

       8.4    Cooldown for Loading

       8.5    Ramp-up to Bulk Rate

       8.6    Bulk Rate Loading

       8.7    Ramp-down

       8.8    Post-loading Operations

       8.9    Departure from Load Port

9     Laden Voyage

       9.1    Overview

       9.2    Laden Voyage of LNG Carriers with Gas Burning Propulsion System

       9.3    Laden Voyage of LNG Carriers with Reliquefication Plant

       9.4    Further Considerations on Laden Voyage

10   Discharge Operations

       10.1  Overview

       10.2  Preparation for Discharge

       10.3  Pre-discharge Operations

       10.4  Ramp-up to Bulk Rate

       10.5  Operational Description – Bulk Rate Discharge

       10.6  Ramp-down

       10.7  Post-discharge Operations

       10.8  Departure from Discharge Port

       10.9  Further Considerations During Discharge

11   Ballast Voyage

       11.1  Overview

       11.2  Heel Management

       11.3  Further Considerations on Ballast Voyage

12   Ship to Ship Transfer Operations

       12.1  Pre-arrival Stage

       12.2  Approach and Mooring Stage

       12.3  Cargo Transfer Stage

       12.4  Post-transfer Procedure

Section 4: Pre Dry-dock Preparations

13   Cargo Tank Operations

       13.1  Warming up Cargo Tanks

       13.2  Inerting of Cargo Tanks

       13.3  Aeration of Cargo Tanks


Peter Hyde is a former LNG Training Superintendent with Shell Trading and has over 25 years’ experience in the LNG industry.

Title: LNG Operational Practice. 2nd Edition (eBook)
Number of Pages: 140
Product Code: WS1677EA
ISBN: ISBN 13: 978-1-85609-872-4 (9781856098724), ISBN 10: 1-85609-872-9 (1856098729)
Published Date: January 2020
Binding Format: Paperback
Book Height: 300 mm
Book Width: 210 mm
Book Spine: 5 mm
Author: Peter Hyde

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