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

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 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. 2 2015 LNG Bunkering Course: Section 3.12 – Transfer Process References • An Introduction to LNG Bunkering, Nigel Draffin, Petrospot Limited, England, 2013 • LNG Operations Manual, Washington State Ferries, Report N o : PP061307-3, Rev. 3, Document N o : 167NWYK-12, Dated: 2014-10-22 3 2015 LNG Bunkering Course: Section 3.12 – Transfer Process 1

LNG Bunkering Course: Section 3.12 – Transfer 2015 Process References • 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 4 2015 LNG Bunkering Course: Section 3.12 – Transfer Process Transfer Process • Regardless of transfer method, there are common procedures that should be followed AND … Two Rules to Follow 5 2015 LNG Bunkering Course: Section 3.12 – Transfer Process 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 Source: An Introduction to LNG Bunkering , Nigel Draffin, Petrospot Ltd, England, 2013, Page 4 6 2015 LNG Bunkering Course: Section 3.12 – Transfer Process 2

LNG Bunkering Course: Section 3.12 – Transfer 2015 Process 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 of the operator. • Examples: Smoking, static build up on clothing and subsequent discharge, dropped objects, and the use of non- approved portable electrical equipment. Source: An Introduction to LNG Bunkering , Nigel Draffin, Petrospot Ltd, England, 2013, Page 4 7 2015 LNG Bunkering Course: Section 3.12 – Transfer Process LNG Bunker Transfer Communications  Each operator must have:  UHF walkie talkie.  A direct phone line.  The ability to view level, temperature and pressure of their tanks. 8 2015 LNG Bunkering Course: Section 3.12 – Transfer Process LNG Bunker Transfer Communications • 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 9 2015 LNG Bunkering Course: Section 3.12 – Transfer Process 3

LNG Bunkering Course: Section 3.12 – Transfer 2015 Process 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 10 2015 LNG Bunkering Course: Section 3.12 – Transfer Process Transfer Process • Regardless of transfer modality, procedures common to all:  Safe zone establishment  Connection  Purging  Cooldown  Test of ESD system 11 2015 LNG Bunkering Course: Section 3.12 – Transfer Process Transfer Process • Regardless of transfer modality, procedures common to all:  LNG bunker transfer  Gas freeing  De-icing  Disconnection  Custody transfer 12 2015 LNG Bunkering Course: Section 3.12 – Transfer Process 4

LNG Bunkering Course: Section 3.12 – Transfer 2015 Process Safe Zone Establishment  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 or liquid escape. 13 2015 LNG Bunkering Course: Section 3.12 – Transfer Process Connection  Connect hoses / arms / cryogenic hose to bunker manifold.  Inspect flanges and clean flanges / mating surfaces.  Gasket / O-ring installed (new each transfer). 14 2015 LNG Bunkering Course: Section 3.12 – Transfer Process Connection  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. 15 2015 LNG Bunkering Course: Section 3.12 – Transfer Process 5

LNG Bunkering Course: Section 3.12 – Transfer 2015 Process Connection  Soap test all connections:  Soap will bubble if there is a leak. 16 2015 LNG Bunkering Course: Section 3.12 – Transfer Process Transfer Process • Purging:  Displace O 2 from hoses/arms with N 2:  Supplied by ship/terminal by hose connection.  Purging end points:  O 2 = <1%  Dewpoint < 40ºC 17 2015 LNG Bunkering Course: Section 3.12 – Transfer Process 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. 18 2015 LNG Bunkering Course: Section 3.12 – Transfer Process 6

LNG Bunkering Course: Section 3.12 – Transfer 2015 Process Transfer Process • Test of ESD system:  Ship to shore:  System tripped from ship control.  All ESD valves close.  System reset. 19 2015 LNG Bunkering Course: Section 3.12 – Transfer Process Transfer Process • Test of ESD system:  Shore to ship:  System tripped from shore control.  All ESD valves close.  System reset. 20 2015 LNG Bunkering Course: Section 3.12 – Transfer Process 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). 21 2015 LNG Bunkering Course: Section 3.12 – Transfer Process 7

LNG Bunkering Course: Section 3.12 – Transfer 2015 Process Transfer Process • LNG bunker transfer:  Topping off:  Further reduced transfer rate.  Complete transfer / stop pumps-close valves. 22 2015 LNG Bunkering Course: Section 3.12 – Transfer Process 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 N 2 displacing LNG to ship and/or suppliers storage tanks. 23 2015 LNG Bunkering Course: Section 3.12 – Transfer Process Transfer Process • Gas Freeing:  Gas free end point <1% CH 4 24 2015 LNG Bunkering Course: Section 3.12 – Transfer Process 8

LNG Bunkering Course: Section 3.12 – Transfer 2015 Process Transfer Process • De-icing lines/hoses:  Water spray on hoses/arms to de-ice. 25 2015 LNG Bunkering Course: Section 3.12 – Transfer Process Transfer Process • Disconnection:  Once gas free and de-iced hoses/arms are disconnected and returned to stowed location/position. 26 2015 LNG Bunkering Course: Section 3.12 – Transfer Process 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 27 2015 LNG Bunkering Course: Section 3.12 – Transfer Process 9

LNG Bunkering Course: Section 3.12 – Transfer 2015 Process 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 28 2015 LNG Bunkering Course: Section 3.12 – Transfer Process Transfer Process • At every step of the LNG bunker transfer REMEMBER : 29 2015 LNG Bunkering Course: Section 3.12 – Transfer Process Summary and Conclusions • 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 30 2015 LNG Bunkering Course: Section 3.12 – Transfer Process 10