Explanatory notes to the summary of minimum requirements
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - International Codes - 1983 IGC Code - International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk - Chapter 19 Summary of Minimum Requirements - Explanatory notes to the summary of minimum requirements

Explanatory notes to the summary of minimum requirements

UN Numbers The UN numbers as listed in the table of chapter 19 are intended for information only.
Vapour detection required(column f) F - Flammable vapour detection
  T - Toxic vapour detection
  0 - Oxygen analyser
  F + T - Flammable and toxic vapour detection
Gauging-types permitted (column g) I - Indirect or closed, as described in 13.2.2.1 and .2
  C - Indirect, or closed, as described in 13.2.2.1, .2 and .3
  R - Indirect, closed or restricted, as described in13.2.2.1, .2, .3 and .4
Refrigerant gases     Non-toxic and non-flammable gases such as:
      dichlorodifluoromethane (1028)
      dichloromonofluoromethane (1029)
      dichlorotetrafluoroethane (1958)
      monochlorodifluoromethane (1018)
      monochlorotetrafluoroethane (1021)
      monochlorotrifluoromethane (1022)
       

 Unless otherwise specified, gas mixtures containing less than 5% total acetylenes may be transported with no further requirements than those provided for the major components.

 MFAG numbers are provided for information on the emergency procedures to be applied in the event of an incident involving the products covered by the IGC Code. Where any of the products listed are carried at low temperature from which frostbite may occur MFAG No.620 is also applicable.

a b c d e f g h i
Product name UN Number Ship type In-dependent tank type C required Control of vapour space within cargo tanks Vapour detection Gauging MFAG table no. Special requirements
Acetaldehyde 1089 2G/2PG — Inert F + T C 300 14.4.3, 14.4.4, 17.4.1, 17.6.1
Ammonia, anhydrous 1005 2G/2PG — — T C 725 14.4.2, 14.4.3, 14.4.4, 17.2.1, 17.13
Butadiene 1010 2G/2PG — — F+T R 310 17.2.2, 17.4.2, 17.4.3, 17.6, 17.8
Butane 1011 2G/2PG — — F G 310  
Butane-propane mixtures 1011/ 1978 2G/2PG — — F R 310  
Butylenes 1012 2G/2PG — — F R 310  
Carbon dioxide — 3G Yes — — C —  
Chlorine 1017 1G Yes Dry T I 740 14.4, 17.3.2, 17.4.1, 17.5, 17.7, 17.9, 17.14
Diethyl ether* 1155 2G/2PG — Inert F + T C 330 14.4.2, 14.4.3, 17.2.6, 17.3.1, 17.6.1, 17.10, 17.11, 17.15
Dimethylamine 1032 2G/2PG — — F + T C 320 14.4.2, 14.4.3, 14.4.4, 17.2.1
Dimethyl ether — 2G/2PG — — F + T C —  
Ethane 1961 2G — — F R 310  
Ethyl chloride 1037 2G/2PG — — F + T R 340  
Ethylene 1038 2G — — F R 310  
Ethylene oxide 1040 1G Yes Inert F + T C 365 14.4.2, 14.4.3, 14.4.4, 14.4.6, 17.2.2, 17.3.2, 17.4.1, 17.5, 17.6.1, 17.16
Ethylene oxide-propylene oxide mixtures with ethylene oxide content of not more than 30% by weight* 2983 2G/2PG — Inert F + T C 365 14.4.3, 17.3.1, 17.4.1, 17.6.1, 17.10, 17.11, 17.20
Isoprene* 1218 2G/2PG — — F R 310 14.4.3, 17.8, 17.10, 17.12
Isopropylamine* 1221 2G/2PG — — F + T C 320 14.4.2, 14.4.3, 17.2.4, 17.10, 17.11, 17.12, 17.17
Methane (LNG) 1972 2G — — F C 620  
Methyl acetylene-propadiene mixtures 1060 2G/2PG — — F R 310 17.18
Methyl bromide 1062 1G Yes — F + T C 345 14.4, 17.2.3, 17.3.2, 17.4.1, 17.5, 17.9
Methyl chloride 1063 2G/2PG — — F + T C 340 17.2.3
Monoethylamine* 1036 2G/2PG — — F + T C 320 14.4.2, 14.4.3, 14.4.4, 17.2.1, 17.3.1, 17.10, 17.11, 17.12, 17.17

Nitrogen 2040 3G — — O C 620 17.19
Pentanes (all isomers)* 1265 2G/2PG — — F R 310 14.4.4, 17.10, 17.12
Pentene (all isomers)* 1265 2G/2PG — — F R 310 14.4.4, 17.10, 17.12
Propane 1978 2G/2PG — — F R 310  
Propylene 1077 2G/2PG — — F R 310  
Propylene oxide* 1280 2G/2PG — Inert F + T C 365 14.4.3, 17.3.1, 17.4.1, 17.6.1, 17.10, 17.11, 17.20
Refrigerant gases (see notes) 1280 2G/2PG — — — R 350  
Sulphur dioxide 1079 12 Yes Dry T C 635 14.4, 17.3.2, 17.4.1, 17.5, 17.7, 17.9
Vinyl chloride 1086 2G/2PG — — F + T C 340 14.4.2, 14.4.3, 17.2.2, 17.2.3, 17.3.1, 17.6, 17.21
Vinyl ethyl ether* 1302 2G/2PG — Inert F + T C 330 14.4.2, 14.4.3, 17.2.2, 17.3.1, 17.6.1, 17.8, 17.10, 17.11, 17.15
Vinylidene chloride* 1303 2G/2PG — Inert F + T R 340 14.4.2, 14.4.3, 17.2.5, 17.6.1, 17.8, 17.10, 17.11
* This cargo is covered also by the IBC Code.
Parent topic: Chapter 19 Summary of Minimum Requirements
Copyright 2022 Clasifications Register Group Limited, International Maritime Organization, International Labour Organization or Maritime and Coastguard Agency. All rights reserved. Clasifications Register Group Limited, its affiliates and subsidiaries and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Clasifications Register'. Clasifications Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Clasifications Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract.