Recommendations for Liquefied Gas Carrier Manifolds (2nd, 2018)

Recommendations for Liquefied Gas Carrier Manifolds 2nd Ed, 2018

These recommendations are for liquefied petroleum gas (LPG) carriers and liquefied natural gas (LNG) carriers. For the purposes of this document, the term LPG carrier refers to liquefied gas cargoes carried between the temperature range of 0°C to -104°C. These recommendations do not apply to existing ships, and there is no suggestion that existing ships should be altered.

It is recognized that some new gas carrier designs may not be able to conform to all of the recommendations in this document, however, this document is intended to serve as a starting point with a view to minimizing differences as much as possible.

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