Recommendations for Liquefied Gas Carrier Manifolds

Published: March 2018

Author: SIGTTO

The aim of this publication is to improve standardisation of LPG and LNG carrier manifolds to assist in the safe connection of cargo transfer equipment at every facility.

Guidance is also provided on cargo spill containment, including deck protection, coaming, drip trays, gratings, drainage and water curtains.

The book categorises carriers by cargo capacity and the recommendations are scaled so they can be applied to carriers of all sizes. Some new gas carrier designs may not be able to conform to all of the recommendations. However, this document is intended to serve as a starting point with a view to minimising differences as much as possible.

Contents Listing:

1. Introduction

1.1 Scope

1.2 Size Categories

2. Manifold Position

2.1 Manifold – LPG

2.2 Manifold – LNG

3. Protection from Cargo Spill

3.1 Deck Protection

3.2 Coaming Requirements

3.3 Drip Trays

3.4 Gratings

3.5 Drainage – LPG

3.6 Drainage – LNG

3.7 Water Curtains for LNG Carriers

4. Manifold Design

4.1 Carbon Steel Manifold

4.2 Stainless Steel Manifold

4.3 Assumptions used for Load Calculations

5. Manifold Specification and Fittings

5.1 Manifold Flanges

5.2 Presentation Flanges

5.3 Marking of Manifolds

5.4 Distance Pieces

5.5 Reducers and Spool Pieces

6. Additional Requirements

6.1 Water and other Connections

6.2 Manifold Area Illumination

6.3 Lifting Equipment and Cargo Hose Support

6.4 LPG Vessels Involved in Floating Hose Transfers

6.5 Access and Exits from the Manifold Area

6.6 Access during Cargo Transfer

7. Bunker Manifolds

7.1 Number and Arrangement

7.2 Size and Location of Bunker Manifold

7.3 Reducers and Spool Pieces for Bunkering

7.4 Strength

7.5 Oil Spill Containment

7.6 LNG Spill Containment and Protection

7.7 Oil Bunker Hose Saddle

7.8 Other Connections

Annexes

Annex 1 – Manifold Strainers

Annex 2 – Glossary of Terms and Abbreviations

Annex 3 – References