LNG Bunkering Course: Section 3.12 Transfer 2015 Process Safe - - PDF document

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LNG Bunkering Course: Section 3.12 Transfer 2015 Process Safe - - PDF document

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LNG Bunkering Course: Section 3.12 Transfer 2015 Process LNG Bunkering Course Section 3.12 Transfer Process 1 2015 LNG Bunkering Course: Section 3.12 Transfer Process Overview of Section 3.12: Transfer Process Two Rules that

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1 LNG Bunkering Course: Section 3.12 – Transfer Process 2015

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

LNG Bunkering Course

Section 3.12 – Transfer Process

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

Overview of Section 3.12: Transfer Process

  • Two Rules that Need to be Always

Followed

  • Importance of Communication
  • Following the Process

Unless otherwise noted, all of the information in this section is based on the above publications, as well as the professional experiences of Capt. John Egan.

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • An Introduction to LNG

Bunkering, Nigel Draffin, Petrospot Limited, England, 2013

  • LNG Operations Manual,

Washington State Ferries, Report

No: PP061307-3, Rev. 3, Document No: 167NWYK-12, Dated: 2014-10-22

References

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2 LNG Bunkering Course: Section 3.12 – Transfer Process 2015

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • Gas as a Marine Fuel, Safety

Guidelines, The Society for Gas as a Marine Fuel (SGMF)

  • Recommended Practice –

Development and Operation of Liquefied Natural Gas Bunkering Facilities, DNV•GL-RP-

0006:2014-01

References

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • Regardless of transfer method, there

are common procedures that should be followed AND…

Two Rules to Follow Transfer Process

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • Connection

RULE 1

Never let fuel gas (NG) and air be present at the same time in the same space

RULE 2

If you fail to follow RULE 1 then make sure there is no uncontrolled source of ignition

Transfer Process

Source: An Introduction to LNG Bunkering, Nigel Draffin, Petrospot Ltd, England, 2013, Page 4

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3 LNG Bunkering Course: Section 3.12 – Transfer Process 2015

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • Uncontrolled Source of Ignition
  • Uncontrolled sources of ignition are those

not considered in the design of the facility and may not be under the direct controlled

  • f the operator.
  • Examples: Smoking, static build up on

clothing and subsequent discharge, dropped objects, and the use of non- approved portable electrical equipment.

Transfer Process

Source: An Introduction to LNG Bunkering, Nigel Draffin, Petrospot Ltd, England, 2013, Page 4 8

2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • Each operator must have:
  • UHF walkie talkie.
  • A direct phone line.
  • The ability to view level, temperature

and pressure of their tanks.

LNG Bunker Transfer Communications

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • LNG Bunker Transfer Communications
  • Each operator must have:
  • The ability to monitor temperature and

pressure of transfer process

  • The ability to monitor alarms
  • The ability to activate an ESD

LNG Bunker Transfer Communications

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4 LNG Bunkering Course: Section 3.12 – Transfer Process 2015

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • Standard transfer method via flexible

cryogenic hose or hard arm between supply source and receiving ship.

  • Supply sources:
  • Shore tank
  • Barge
  • Bunker ship
  • Road tanker
  • Cassette tank system

Transfer Process

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • Regardless of transfer modality,

procedures common to all:

  • Safe zone establishment
  • Connection
  • Purging
  • Cooldown
  • Test of ESD system

Transfer Process

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • Regardless of transfer modality,

procedures common to all:

  • LNG bunker transfer
  • Gas freeing
  • De-icing
  • Disconnection
  • Custody transfer

Transfer Process

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5 LNG Bunkering Course: Section 3.12 – Transfer Process 2015

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • Set up appropriate safe zone to keep all

personnel not directly involved in bunker operation away from:

  • From bunker manifold area.
  • From any potential exposure to vapor
  • r liquid escape.

Safe Zone Establishment

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • Connect hoses / arms / cryogenic hose

to bunker manifold.

  • Inspect flanges and clean flanges /

mating surfaces.

  • Gasket / O-ring installed (new each

transfer).

Connection

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • Insulated flanges per SIGTTO, ISGOTT,

and the ISO guideline.

  • Leak test hose/arm connections:
  • Liquid line connection tested at

approximately 5 bar.

  • Vapor line connection pressure

tested 1–2 bar.

Connection

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6 LNG Bunkering Course: Section 3.12 – Transfer Process 2015

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • Soap test all connections:
  • Soap will bubble if there is a leak.

Connection

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • Purging:
  • Displace O2 from hoses/arms with N2:
  • Supplied by ship/terminal by hose

connection.

  • Purging end points:
  • O2 = <1%
  • Dewpoint < 40ºC

Transfer Process

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • Cool-down:
  • Small quantity of LNG is admitted to the

transfer line, vaporizing to methane gas.

  • Cold methane gas cools down the line

until it is displaced by LNG.

Transfer Process

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7 LNG Bunkering Course: Section 3.12 – Transfer Process 2015

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • Test of ESD system:
  • Ship to shore:
  • System tripped from ship control.
  • All ESD valves close.
  • System reset.

Transfer Process

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • Test of ESD system:
  • Shore to ship:
  • System tripped from shore control.
  • All ESD valves close.
  • System reset.

Transfer Process

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • LNG bunker transfer:
  • Start pumps and ramp up to maximum

agreed upon transfer rate:

  • Monitor temps / pressure / tank level.
  • Ramping down (reduce transfer rate).

Transfer Process

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • LNG bunker transfer:
  • Topping off:
  • Further reduced transfer rate.
  • Complete transfer / stop pumps-close

valves.

Transfer Process

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • Gas Freeing:
  • LNG remaining in hoses/arms must be

displaced by:

  • Allowing LNG in the line to vaporize the

remaining LNG back into storage on the ship and/or suppliers storage tank, or

  • Pressurizing line with N2 displacing LNG

to ship and/or suppliers storage tanks.

Transfer Process

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • Gas Freeing:
  • Gas free end point <1% CH4

Transfer Process

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • De-icing lines/hoses:
  • Water spray on hoses/arms to de-ice.

Transfer Process

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • Disconnection:
  • Once gas free and de-iced hoses/arms

are disconnected and returned to stowed location/position.

Transfer Process

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • Custody transfer:
  • The quantity of LNG bunkers transferred

is determined by a mutually agreed upon method between the bunker supplier and receiver. Two most common methods are:

  • Volume determined by calculations

from vessel tank level system, or

  • Volume measured by flow meter

Transfer Process

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • Custody transfer
  • Regardless of method used, volume

transferred to be agreed upon by both parties

  • Independent Surveyor may be used to

certify volume transferred

  • Appropriate documentation signed by

both parties

  • After LNG Transfer Checklist

Transfer Process

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • At every step of the LNG bunker transfer

REMEMBER:

Transfer Process

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2015 LNG Bunkering Course: Section 3.12 – Transfer Process

  • The transfer process is based on two

very important rules:

  • Rule #1: Never let air and gas in the

same space and time.

  • Rule #2: Make sure that there is no

source of ignition.

  • All require very specific steps.
  • Above all: Safety, Safety, and Safety

Summary and Conclusions