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LNG Bunkering

SIEM courtesy

Copyright Port of Goteborg

Carolina REMIRO

Safety Surveyor at Bureau Veritas

Congreso GASNAM

El Gas Natural Garantiza la Calidad del Aire

Madrid, 8th March 2017

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BV is front runner in LNG bunkering

2 BV classed vessels

Courtesy Port of Goteborg

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BV is front runner in LNG bunkering

LNG Bunkering practices

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LNG bunkering usual pratices

Shore to Ship

Ship to Ship

ISO containers LNG

Change over

Truck to Ship

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Truck to Ship bunkering (1/2)

This method is recognised as most suitable where the amount of LNG to be transferred is less

than 200 cubic meters and when the commercial operation of the ship allows a sufficient

duration for bunkering.

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Ship to Ship bunkering (Viking Grace > 1000 bunkering ops)

LNG bunker vessels

SKANGAS

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LNG as fuel vessels are spreading

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LNG bunker vessels market

Courtesy of Suardiaz

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GTT Bunker vessel « 2 barg »

► GTT has developed the design for a LNG bunker ship 4k

With tank pressure set up at 700 mbarg

An AIP was obtained from BV in September 2014

It is defined as a reference case

To give more operational flexibility, an alternative design has been studied with the tank pressure set at 2 barg

Risks during bunkering

Copyright GTT

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Why a risk assessment for LNG bunkering?

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Effects of LNG spillage/leak

► Embrittlement of carbon steel structures

► Vapour cloud

LNG leakLNG spillage

Classification of LNG Bunkering Ship

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LNG Bunkering Ship – NR620

New service notation “LNG bunkering ship” in order to meet the

expectations of owners who plan to build ships to respond to the new

market of ship using LNG as a fuel.

BV NR 620 - LNG Bunkering Ship, published in October 2015

Risk Analysis is required

NR620 covers:

LNG bunkering station

LNG transfer systems

Transfer area

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LNG Transfer Systems- ERC & QC / DC

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Emergency Shut-down (ESD) system

• Required to effectively stops the transfer of LNG (and vapour) between the

receiving ship and the bunkering ship.

• The ESD can be activated automatically or manually.

• The bunkering line is to be designed to withstand the surge pressure that

may result from the activation of the ESD system.

• ESD system is to be activated automatically in case of:• Low pressure in the supply tank

• Sudden pressure drop at the transfer pump discharge

• High pressure in the receiving tank

• LNG or vapour leak detection

• Activation of the emergency release coupling

• Safe working envelope of the loading arm exceeded

Risk analysis

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HAZOP analysis for the LNG transfer system

► Hazard and Operability study

► Single Failure Concept

► Systems to be analysed

1. Bunkering piping systems

2. Gas detection systems

3. Control, monitoring and safety systems

► Unexpected events to be analysed

1. LNG leakage (hose, piping enclosure)

2. Overpressure/venting/motions of the receiving ship

3. Black-out during the bunkering operations

Operation Procedures and guidelines

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IACS Rec 142 & SGMF + IAPH Safety guidelines

+ BV NI 618 Guidelines on LNG Bunkering

+

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SGMF LNG Bunkering guidelines (SGMF + IACS + IAPH)

► A safety zone and a security zone should be established around the bunkering operation in accordance with ISO/TS 18683.

► These zones are in addition to the “IGF code” hazardous area that are required around areas with potential for explosive atmospheres such as the bunkering connections.

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Compatibility between receiving ship and bunker vessel

• Draught and freeboard difference

• Compatibility of the bunkering arm operating amplitude with the ship bunkering station

• Possibility of visual contact between ship operators and truck operator during bunkering

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Thank you for you attention !

TERNTANK courtesy