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Summary of Minimum Requirements for LNG and LPG tankers

Article covers summary of minimum requirements for ships carrying LNG and LPG.

Explanatory Notes to the Summary of Minimum Requirements

MFAG numbers are provided for information on the emergency procedures to be applied in the event of an incident with 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.

UN-numbers (column b): The UN-numbers listed in column (b) of the list of products are intended for information only.

Gas tanker Marvel Eagle
LNG “Marvel Eagle”
Source: foter.com

Vapour detectionrequired (column f):

  • F – Flammable vapour detection;
  • T – Toxic vapour detection;
  • O – Oxygen analyser;
  • F + T – Flammable and toxic vapour detection.

Gauging – typespermitted (column g):

Pollution category: Pollution category according to MARPOL 73/78, Annex II. (A “–” means that the productdoes not present a pollution hazard).

Refrigerant gases: Non toxic and non-flammable gases are e.g.:

Product nameUN-No.Chemical formulaDensity [kg/m3]Boiling point [°C]
Dichlorodifluoromethane (R 12)1028CCl2 F21487-30
Dichloromonofluoromethane (R 21)1029CHCl2 F14109
Dichlorotetrafluoroethane (R 114)1958CCl F2 – CCI F215103,6
Monochlorodifluoromethane (R 22)1018CHCl F21414-41
Monochlorotetrafluoroethan (R 124)1021CHCl F – CF3
Monochlorotrifluoromethane (R 13)1022CCl F31526-81,4

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

Guidance: Products to which an asterisk * is affixed, are also covered by Rules for Ships Dangerous Chemicals In Bulk (Part 1,Vol.X). The values given in columns (j) – (n) are for guidance. The guidance values for the product density are related to the boiling point.

Table 1. List of Products (columns a – h)
abcdefgh
Product NameUN-No.Ship typeType C Independent tank requiredControl of vapour space within cargo tanksVapour detectionGaugingMFAG-No.
Acetaldehyde10892 G/2 PGInertF + TC300
Ammonia, anhydrous10052 G/2 PGTC725
Butadiene10102 G/2 PGF + TR310
Butane10112 G/2 PGFR310
Butane-propane1011/19782 G/2 PGFR310
Butylenes10122 G/2 PGFR310
Carbon dioxide3 GYesC
Chlorine10171 GYesDryTI740
Diethyl ether*11552 G/2 PGInertF + TC330
Dimethylamine10322 G/2 PGF + TC320
Dimethyl ether2 G/2 PGF + TC
Ethane19612 GFR310
Ethyl chloride10372 G/2 PGF + TR340
Ethylene10382 GFR310
Ethylene oxide10401 GYesInertF + TC365
Ethylene oxide/propylene oxide mixtures (max. 30 % by weight ethylene oxide)*29832 G/2 PGInertF + TC365
Isoprene*12182 G/2 PGFR310
Isopropylamine*12212 G/2 PGF + TC320
Methane (LNG)19722 GFC620
Methyl acetylenepropadiene mixtures10602 G/2 PGFR310
Methyl bromide10621 GYesF + TC345
Methyl chloride10632 G/2 PGF + TC340
Table 2. List of Products (columns i – o)
aijklmno
Product NameSpecial requirementsChemical formulaDensity [kg/m3]Boiling-point [°C]Flash-point [°C]Auto-ignition temperature [°C]Pollution category
AcetaldehydePersonnel protection requirements for individual products, Personnel protection requirements for individual products, Refrigeration systems, Exclusion of air from vapour spacesCH3CHO78021-27140
Ammonia, anhydrousPersonnel protection requirements for individual products, Personnel protection requirements for individual products, Personnel protection requirements for individual products, Materials of construction, AmmoniaNH3680-34630
ButadieneMaterials of construction, Refrigeration systems, Refrigeration systems, Refrigeration systems, Exclusion of air from vapour spaces, InhibitionCH2CHCHCH2650-4,5-85415
ButaneC4H10600-0,5-60365
Butane-propane mixtures630-50
Butylenes630-6,3-75440
Carbon dioxideCO2-79
ChlorinePersonnel protection requirements for individual products, Independent tanks, Refrigeration systems, Deck cargo piping, Moisture control, Permanently installed toxic gas detectors, ChlorineCl21560-34
Diethyl ether*Personnel protection requirements for individual products, Personnel protection requirements for individual products, Materials of construction, Independent tanks, Exclusion of air from vapour spaces, Flame screens on vent outlets, Maximum allowable quantity of cargo per tank, Diethyl ether and vinyl ethyl etherC2H5OC2H570034,5-45180
DimethylaminePersonnel protection requirements for individual products, Personnel protection requirements for individual products, Personnel protection requirements for individual products, Materials of construction(CH3)2NH6707-18400
Dimethyl ether(CH3)2O735-24,8-42,2240
EthaneC2H6550-88-183515
Ethyl chlorideC2H5Cl89012-50510
EthyleneC2H4560-104-136425
Ethylene oxidePersonnel protection requirements for individual products, Personnel protection requirements for individual products, Personnel protection requirements for individual products, Personnel protection requirements for individual products, Materials of construction, Independent tanks, Refrigeration systems, Deck cargo piping, Exclusion of air from vapour spaces, Ethylene oxide(CH2)2O87011-18440
Ethylene oxide/propylene oxide mixtures (max. 30 % by weight ethylene oxide)*Personnel protection requirements for individual products, Independent tanks, Refrigeration systems, Exclusion of air from vapour spaces, Flame screens on vent outlets, Maximum allowable quantity of cargo per tank, Propylene oxide and mixtures of ethylene oxide/propylene oxide with ethylene oxide content of not more than 30 % by weight(CH2)2O+CH3CHOCH283027-20430C
Isoprene*Personnel protection requirements for individual products, Inhibition, Flame screens on vent outlets, Submerged electric cargo pumpsCH2C(CH3)CHCH268034-48220C
Isopropylamine*Personnel protection requirements for individual products, Personnel protection requirements for individual products, Materials of construction, Flame screens on vent outlets, Maximum allowable quantity of cargo per tank, Submerged electric cargo pumps, Isopropylamine, monoethylamine(CH3)2CHNH267032-20400C
Methane (LNG)CH4420-163-175595
Methyl acetylenepropadiene mixturesMethyl acetylene-propadiene mixtures620-20
Methyl bromidePersonnel protection requirements for individual products, Materials of construction, Independent tanks, Refrigeration systems, Deck cargo piping, Permanently installed toxic gas detectorsCH3Br17304538
Methyl chlorideMaterials of constructionCH3Cl970-24-24625
Table 3. List of Products (columns i – o) (continued)
abcdefgh
Product NaneUN-No.Ship typeType C Independent tank requiredControl of vapour space within cargo tanksVapour detectionGaugingMFAG-No.
Monoethylamine*10362 G/2 PGFR320
Nitrogen20403 GOC620
Pentanes* (all isomers)12652 G/2 PGFR310
Pentene* (all isomers)11082 G/2 PGFR310
Propane19782 G/2 PGFR310
Propylene10772 G/2 PGFR310
Propylene oxide*12802 G/2 PGInertF + TC365
Refrigerant gases3 GR350
Sulphur dioxide10791 GYesDryTC635
Vinyl chloride10862 G/2 PGF + TC340
Vinyl ethyl ether*13022 G/2 PGInertF + TC330
Vinylidene chloride*13032 G/2 PGInertF + TR340
Table 4. List of Products (columns i – o) (continued)
aijklmno
Product NameSpecial requirementsChemical formulaDensity [kg/m3]Boiling-point [°C]Flash-point [°C]Auto-ignition temperature [°C]Pollution category
Monoethylamine*Personnel protection requirements for individual products, Personnel protection requirements for individual products, Personnel protection requirements for individual products, Materials of construction, Independent tanks, Flame screens on vent outletsC2H5NH268017-49384C
Nitrogen NitrogenN2808-196
Pentanes* (all isomers)Personnel protection requirements for individual products, Flame screens on vent outlets, Submerged electric cargo pumpsCH3(CH2)3CH362629-36-49308C
Pentene* (all isomers)Personnel protection requirements for individual products, Flame screens on vent outlets, Submerged electric cargo pumpsCH3CH2CH2CH = CH265630-37-18270C
PropaneC3H8590-42,3-42470
PropyleneC3H6610-48-108455
Propylene oxide*Personnel protection requirements for individual products, Independent tanks, Refrigeration systems, Exclusion of air from vapour spacesCH3CHOCH282234-20430C
Refrigerant gasesSee notes
Sulphur dioxidePersonnel protection requirements for individual products, Independent tanks, Refrigeration systems, Deck cargo piping, Moisture control, Permanently installed toxic gas detectorsSO21460-10
Vinyl chloridePersonnel protection requirements for individual products, Personnel protection requirements for individual products, Materials of construction, Independent tanks, Exclusion of air from vapour spaces, Propylene oxide and mixtures of ethylene oxide/propylene oxide with ethylene oxide content of not more than 30 % by weightCH2CHCl970-14-77472
Vinyl ethyl ether*Personnel protection requirements for individual products, Personnel protection requirements for individual products, Materials of construction, Independent tanks, Exclusion of air from vapour spaces, Inhibition, Flame screens on vent outlets, Maximum allowable quantity of cargo per tank, Diethyl ether and vinyl ethyl etherCH2 – CHOC2H57503645200C
Vinylidene chloride*Personnel protection requirements for individual products, Personnel protection requirements for individual products, Materials of construction, Exclusion of air from vapour spaces, Inhibition, Flame screens on vent outlets, Maximum allowable quantity of cargo per tankCH2 – CCl2125032-10460B
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