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Published Date

August 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.


No. OF PAGES: 72

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Owing to the nature of their construction, certain types and sizes of liquefied gas carriers may be unable to comply with all the requirements of these recommendations. Where possible, the differences between ship design and these recommendations should be minimised.

Notwithstanding the progress that has been made since 1979 to improve conformity in manifold arrangements, it is recognised that many existing ships and terminals are unable to follow these recommendations. Owners and operators of such ships and terminals should appreciate that this may lead to operational restrictions and they should be prepared to discuss these differences before a ship is programmed to any berth for the first time. It is not suggested nor implied that ships constructed before publication of this document should be altered.

Although Ship to Ship (STS) transfer operations are carried out on a regular basis with LPG, LNG STS is a relatively recent development. Considerations are made within this document to take into account the industry movement towards LNG STS and also to review past experience with LPG STS.

Manifold arrangements and strainer guidelines for LPG and LNG carriers are brought together to promote safety and efficiency of operations within this valuable guide.


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

13.1 Electrical Equipment

13.2 Fire-fighting

13.3 Emergency Exits from the Manifold Area

13.4 Personnel Access during Cargo Transfer
13.5 Tripping Hazards

13.6 Removal of Manifold Blank Covers

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: August 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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