The IGF code for GAS FUELLED SHIPS Development, content, supporting class rules

Transcription

1 MARITIME The IGF code for GAS FUELLED SHIPS Development, content, supporting class rules DNV DNV GL GL November 2015 SAFER, SMARTER, GREENER

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3 The development trend is moving from LOCAL Norway 3

4 to GLOBAL 4

5 and from SMALL to LARGER vessels In Operation On Order Offshore Ferry/RORO Bulk Container Gas Carriers 5

6 LNG uptake by vessel segment Updated 23 October 2015 Excluding LNG carriers and inland waterway vessels 6

7 The development of the IGF code- challenges July 2015 Jan 2017 NMA draft to IMO Interim Guidelines MSC.285(86) IGF Code Work mainly done in correspondence groups between yearly working groups in IMO Lack of experience with gas as ship fuel Development of industry in parallel with code writing Not possible to fully cover all solutions 7

8 The development of the IGF code July 2015 Jan 2017 NMA draft to IMO Interim Guidelines MSC.285(86) IGF Code Interim guidelines on safety for natural gas- fuelled engine installations in ships, Resolution MSC.285(86) in place from 2009 Voluntary guidelines Limited to natural gas, limited to internal combustion engines 8

9 The development of the IGF code June 2015 Jan 2017 NMA draft to IMO Interim Guidelines MSC.285(86) IGF Code Detail requirements for natural gas Other low flashpoint fuels allowed, approval based on alternative design approach More detailed provisions for methanol fuel and fuel cells is under development in correspondence groups now The IGF Code was adopted by IMO in June 2015 (MSC95), i.e. entry into force 1 January 2017 Mandatory for all gas and other low flashpoint fuel ships 9

10 IGF code and IGC code relation Gas carriers need not apply the IGF code, only IGC code Also if not burning own cargo, but a different gas for example an LPG carrier using LNG as fuel 10

11 Gas carriers are not the same as Gas Fuelled vessels Ungraded 11

12 Differences between gas carrier and gas fuelled Gas carrier Dedicated area for carriage of LNG. Complete vertical separation from accommodation areas and machinery spaces. No piping systems containing liquid gas outside of the cargo area Gas fuelled ship Few limitations for areas for storage of LNG. Very few restrictions to the location of piping systems containing liquid or gaseous gas. 12

13 Differences between gas carrier and gas fuelled Gas carrier All tank connections and tank valves are to be located in a dedicated cargo area on open deck. Gas fuelled ship Tank connections and tank valves may be located in spaces below deck, having access from non-hazardous spaces. 13

14 Differences between gas carrier and gas fuelled Gas carrier A leakage of gas or LNG will typically be on open deck far away from ignition sources Gas fuelled ship A leakage of LNG or gas will typically be in a confined space or close to ignition sources (3-10 m) The handling of LNG is to some degree of an intermittent nature (loading/ unloading) Handling of LNG is continuous 14

15 Requirements in IGF code additional to those in IGC- examples Tank connection space requirements Air locks Note limitations making air locks inside the ER impossible Tank location limitations Away from ship side Away from ER and other high fire risk areas Protected from cargo operations Safety assessment required for certain items in the code (but not a general requirement for natural gas fuel) 15

16 IGF Code content Stand alone code Covering all tank types, requirements for arrangements of spaces, access to spaces, materials, ventilation systems, detection and shut down, etc. Some potential tank types: Vacuum insulated tank with tank connection space Tank type C IHI SPB Containment System Tank type B Bi-lobe pressure vessel Tank Type C Membrane tank 16

17 IGF Code content Code is missing some clarity with regard to some aspects, for example: Handling of liquid gas leakages Arrangements of tank connection spaces for type A, B tanks and membrane tanks Arrangement of fuel preparation spaces with high pressure liquid gas pumps Piping systems secondary barrier for liquid gas New DNV GL rules released in October, filling the gaps Clear requirements also for the above items High pressure pump skid for LNG 17

18 DNV GL Rules- our understanding of the IGF code Prescriptive requirements give clear and prescriptive guidance for building safe gas fuelled ships with known solutions. Functional requirements give us the ability to consider innovative solutions within the framework of the rules The uncertainties for the Owners and Yards are reduced, both when looking into standard solutions and more innovative designs. The main outcome is to more efficiently lower the risks for gas fuelled ship designs. To limit differences in interpretations of the code between class societies, an IACS working group is established to draft common interpretations of the IGF code where this is seen as necessary. 18

19 DNV GL Rules for gas fuelled ship installations Regulatory principles applied throughout the Rule chapter: Ø Segregation principle - to protect the gas fuel installation from external events Fire, collision, grounding, mechanical damages Ø Double barrier principle - to protect the vessel against leakages LNG piping, Gas piping, TCS, Fuel preparation room Ø Leakage detection principle - to give warning and enable automatic safety actions. Leakages anywhere in the fuel system shall be detectable Ø Emergency shut-down principle to reduce consequences of a leakage Leakages anywhere in the fuel system shall be automatically isolated 19

20 Summary June 2015 Jan 2017 NMA draft to IMO Interim Guidelines MSC.285(86) IGF Code The mandatory IGF Code was adopted by IMO in June 2015 (MSC95), with entry into force 1 January 2017 Stand alone code Complete standard for natural gas Gaps in the code are filled by the new DNV GL Rules from October

21 DNV GL trusted partner for LNG fuel projects Updated 23 October 2015 Excluding LNG carriers and inland waterway vessels 21

22 Greener Shipping Summit 10 th November 2015 Athens Torill Grimstad Osberg, Head of Section LNG, Cargo Handling & Cargo Systems SAFER, SMARTER, GREENER 22