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Published Date

July 2011

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Manifold Recommendations for Liquefied Gas Carriers

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These SIGTTO recommendations are intended to serve as a guide to owners and operators of liquefied gas ships, ship builders and planners. The guidance is for new vessels, it is not intended that existing vessels be altered.

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Due to their construction, certain types and sizes of liquefied gas carriers might not be able to comply with all the requirements of these recommendations. Where it is possible, the differences between the ship design and these recommendations should be minimised.


Despite the progress that has been made since 1979 to improve the conformity of manifold arrangements, it is accepted that there are still ships and terminals that cannot follow these recommendations. The owners and operators of these ships and terminals must appreciate that this may lead to operational restrictions and discuss these differences before a ship is programmed to any berth for the first time.


Although Ship to Ship (STS) transfer operations are carried out regularly with LPG, LNG STS is relatively new. This document takes into consideration the industry’s move towards LNG STS and also reviews past LPG STS experiences.


These recommendations bring together the manifold arrangements and strainer guidelines for LPG and LNG carriers, the aim being to promote improved safety and efficiency in operations and to assist in planning the position of loading and discharging facilities in new jetties.


These recommendations are intended to serve as a guide to owners and operators of liquefied gas ships, ship builders and planners. The guidance is for new vessels and it is not intended that existing vessels should be altered.


1. Purpose, Scope and Introduction

1.1. Purpose and Scope

1.2. Introduction

2. Categories of Gas Carriers

2.1 Categories of LPG Carriers

2.2 Categories of LNG Carriers

3. Cargo Manifold Position

3.1 Conventional Construction

3.2 Spherical Construction LNG and LPG Carriers

3.3 Manifold Arrangement

3.4 Presentation Flange Arrangement

3.5 Offshore Marine Loading Systems

4. General Manifold Requirements

4.1 Manifold Material

4.2 Presentation Flanges

4.3 Manifold Strength

4.4 Marking of Manifolds

4.5 Distance Pieces

4.6 Reducers and Spool Pieces

4.7 Manifold Support

5. Strainers on Gas Carriers

5.1 General

5.2 Strainer Type and Disposition

5.3 Flow Characteristics

5.4 Fittings

5.5 Wire Mesh Size

5.6 Strainer Inspection and Maintenance

6. Protection From Cargo Spills

6.1 Manifold Deck Protection
6.2 Coaming Requirements
6.3 Drainage
6.4 Water Curtains on LNG Vessels

6.5 Drip Trays

6.6 Fittings

7. Service Lines

7.1 Drinking Water Connection

8. Bunker Connections

8.1 Number and Arrangement

8.2 Size and Spacing of Presentation Flanges

8.3 Strength

8.4 Reducers and Spool Pieces

8.5 Bunker Fuel Spill Containment
8.6 Diesel/Gas Oil Fuel Manifolds

8.7 Blank Flanges

9. Manifold Area Lighting

10. Lifting Equipment and Cargo Hose Support

11. LPG Vessels Involved in Floating Hose Transfers

12. Safety Requirements

12.1 Electrical Equipment

12.2 Fire-fighting

12.3 Emergency Exits from the Manifold Area

12.4 Personnel Access during Cargo Transfer
12.5 Tripping Hazards

12.6 Removal of Manifold Blank Covers


13. Reference Documents and Bibliography


Title: Manifold Recommendations for Liquefied Gas Carriers
Number of Pages: 72
Product Code: WS1309K
ISBN: ISBN 13: 978-1-85609-494-8 (9781856094948), ISBN 10: 1-85609-494-4 (1856094944)
Published Date: July 2011
Binding Format: Hardback
Book Height: 297 mm
Book Width: 210 mm
Weight: 0.50 kg
Author: Oil Companies International Marine Forum

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