Höegh LNG FSRU Inquiry and Advisory Committee Crib Point ...

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Höegh LNG FSRU

Inquiry and Advisory CommitteeCrib Point Gas Import Jetty and Pipeline Project

12 October 2020

Introduction

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Presentation: Hoegh LNG FSRU

Narrator: Brian Kitney, Head of LNG Origination, AGL

Overview

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1. Introduction to Höegh LNG and FSRUs

2. Crib Point FSRU design

3. LNG regasification

4. FSRU mooring and gas export

5. LNG loading operation

Höegh LNG

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AGL has chartered an FSRU from Höegh LNG for continuous mooring at Crib Point Jetty: Höegh LNG is a leading provider of FSRUs, with inhouse fleet management

Höegh LNG owns the FSRU and will operate this under a long-term charter with AGL

Höegh LNG has a global fleet of 10 FSRUs and 2 LNG vessels in operation, and has LNG operating experience since 1973

10 FSRUs in operation 2 LNGCs on long-term contracts

FSRU – a Floating LNG Import Terminal

A standard LNG carrier with additional features:

Regas module

Metering and gas export facilities

Prepared for Ship to Ship (StS) – LNG transfer from LNGC to FSRU

All technology proven, tested and in safe operation across the world

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Video on FSRU

Höegh LNG

Overview

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Crib Point FSRU Dimensions

Length: ~294m

Breadth: 46m

Loadeddraft: 11.6m

Ballast draft: 9.3mEngine Room

Regas Module

Accommodation & Control Room

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Accommodation is dimensioned for a complement of 45 officers and crew to live and work onboard

Typical FSRU manning ~30 persons on board

The regas operations are controlled from the Cargo Control Room (CCR)

Bridge

Cabin decks

CCR and offices

Onboard Utilities

The FSRU generates its own power through four Dual Fuel engines, equipped with silencers and economizers

The DF engines run on boil-off gas, with liquid fuel as back-up

Two regas boilers provide steam for closed / combined loop operation

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The FSRU engine room - Dual Fuel engines

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LNG Cargo Tanks

4 x LNG Cargo Tanks = total 170,000 m3

LNG Cargo Tanks

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LNG Cargo tanks: Reinforced membrane containment system

The LNG cargo is stored in a cooled condition at around -160°C (not pressurized storage)

Boil-Off Rate: ≤ 0.15%when fully loaded

The FSRU is equipped to manage the Boil-Off Gas onboard

Inside the LNG cargo tank

Ballast tanks in double hull

Crib Point FSRU Construction Video

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Overview

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Regasification

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3 regasification trains, each with capacity of 250 MMscfd

Nominal capacity 500 MMscfd

Minimum capacity 50 MMscfd

Peak capacity 750 MMscfd(open loop) / 500 MMscfd(closed loop)

Regas send-out is controlled from FSRU based on nominated send-out received from shore

The Regasification Module – As seen from the accommodation building

Regasification Process Flow

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1. LNG pumped from storage tanks to common suction drum

2. LNG pumped through heat exchangers for vaporization

3. Intermediate propane loop exchanges heat with LNG

4. The propane intermediate loop is heated by the sea water loop

5. Pressurized Natural Gas exported to shore grid

Gas Export

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Open Loop Operation

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All heat for regasification is taken from the local seawater

Water is discharged at an initial temperature differential of 7°C (max) lower than ambient sea water temperature

The volume of water drawn in and discharged will vary depending on the gas send-out rate

Regas module

Sea water intake

Water returned to mixing zone

1. Sea Water intake

2. SW heat exchange regas

3. Sea Water discharge via discharge ports

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Combined Loop Operation

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Regas module

Regas boilers

Steam heater skid

Heat for regasification is taken from seawater, and further warmed from steam generated by regas boilers located in the engine room

Sea water is discharged with a temperature differential <7°C

The volume of water drawn in will vary depending on the gas send-out rate

Sea water intake

Water returned to mixing zone

1. Sea Water intake

2. SW heated by steam (partly)


4. Sea Water discharge via discharge ports

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Closed Loop Operation

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Seawater loop fully closed. Water is circulated by means of the seawater lift pumps located in the engine room

All heat for regasification taken from steam generated by boilers

Regas moduleRegas boilers

Loop closed –water circulated

Steam heaterfor sea water

Utility water discharge (small other consumers)

1. Sea Water loop closed

2. SW heated by steam


4. Sea Water circulated

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2.3.

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Multiple Discharge Port Solution

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In open / combined loop the regas sea water discharge will be through multiple discharge ports

This is done to improve the mixing of discharged sea water with ambient sea water

Regas module

Multiple discharge ports

Sea Water Treatment

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A Marine Growth Prevention System (MGPS) is installed to control bio-fouling in sea water systems – ensuring required FSRU performance

The MGPS uses electrolysis to generate small amounts of hypochlorite, which naturally degenerates back to natural salts during passage through the system

At the time of discharge, the residual levels of hypochlorite in the sea water is below 0.1ppm – monitored in operation

Example of fouled exchanger Clean exchanger

Overview

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3. LNG Regasification


5. LNG transfer operation

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FSRU mooring and gas export at Crib Point

FSRU is moored to Crib Point Jetty by a 20 mooring line arrangement

LNG Carrier moored side-by-side with the FSRU for LNG transfer operations

HP manifolds for gas export

Gangway tower landing

Crib Point Jetty

Delivery of Gas to Shore

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Gas export through connection to jetty mounted, quick release marine loading arms (MLA)

The FSRU provides

o Gas export flow control

o Gas export metering

o Gas Chromatograph for gas composition measurement

Jetty mounted Marine Loading Arms connected to FSRU manifolds

Overview

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LNG Ship-to-Ship Transfer

The FSRU in Operation

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Höegh LNG FSRU Inquiry and Advisory Committee Crib Point ...

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