The test pressure for tanks intended for the carriage of compressed gases shall be at least 1.5 times the

working pressure as defined in 1.2.1 for pressure receptacles.

The test pressure for tanks intended for the carriage of:

- high pressure liquefied gases; and

- dissolved gases

shall be such that, when the shell is filled to the maximum filling ratio, the pressure reached in the

shell by the substance at 55 °C for tanks with thermal insulation or 65 °C for tanks without thermal

insulation does not exceed the test pressure.

The test pressure for tanks intended for the carriage of low pressure liquefied gases will be:

(a) If the tank is equipped with thermal insulation, at least equal to the vapour pressure, reduced by

0.1 MPa (1 bar) of the liquid at 60 °C, but not less than 1 MPa (10 bar);

(b) If the tank is not equipped with thermal insulation, at least equal to the vapour pressure,

reduced by 0.1 MPa (1 bar), of the liquid at 65 °C, but not less than 1 MPa (10 bar).

The maximum permissible mass of contents per litre of capacity is calculated as follows:

Maximum permissible mass of contents per litre of capacity = 0.95 × density of the liquid phase

at 50 °C (in kg/l)

Moreover the vapour phase shall not disappear below 60 °C.

If the shells are not more than 1.5 m in diameter, the values of the test pressure and maximum filling

ratio conforming to packing instruction P200 in 4.1.4.1 shall be applicable.

The test pressure for tanks intended for the carriage of refrigerated liquefied gases shall be not less

than 1.3 times the maximum allowable working pressure and indicated on the tank but not less

than 300 kPa (3 bar) (gauge pressure); for tanks with vacuum insulation the test pressure shall be not

less than 1.3 times the maximum allowable working pressure increased by 100 kPa (1 bar).

Table of gases and gas mixtures which may be carried in fixed tanks (tank-vehicles), battery-vehicles,

demountable tanks, tank-containers or MEGCs indicating the minimum test pressure for tanks and as

far as applicable the filling ratio

In the case of gases and gas mixtures classified under n.o.s. entries, the values of the test pressure and

the filling ratio shall be prescribed by the expert approved by the competent authority.

When tanks for compressed or high pressure liquefied gases have been subjected to a test pressure

lower than shown in the table, and the tanks are fitted with thermal insulation, a lower maximum load

may be prescribed by the expert approved by the competent authority, provided that the pressure

reached in the tank by the substance at 55 °C does not exceed the test pressure stamped on the tank.

UN No.	Name	Classification code	Minimum test pressure for tanks				Maximum permissible mass of contents per litre of capacity
			With thermal insulation		Without thermal insulation		Maximum permissible mass of contents per litre of capacity
			MPa	bar	MPa	bar	kg
1001	Acetylene, dissolved	4 F	only in battery-vehicles and MEGCs composed of receptacles
1002	Air, compressed	1 A	see 4.3.3.2.1
1003	Air, refrigerated liquid	3 O	see 4.3.3.2.4
1005	Ammonia, anhydrous	2 TC	2.6	26	2.9	29	0.53
1006	Argon, compressed	1 A	see 4.3.3.2.1
1008	Boron trifluoride	2 TC	22.5	225	22.5	225	0.715
1008	Boron trifluoride	2 TC	30	300	30	300	0.86
1009	Bromotrifluoromethane (Refrigerant gas R13B1)	2 A	12	120			1.50
					4.2	42	1.13
					12	120	1.44
					25	250	1.60
1010	BUTADIENES, STABILIZED (1,2- butadiene) or	2 F	1	10	1	10	0.59
1010	BUTADIENES, STABILIZED (1,3- butadiene) or	2 F	1	10	1	10	0.55
1010	BUTADIENES AND HYDROCARBON, MIXTURE, STABILIZED	2 F	1	10	1	10	0.50
1011	Butane	2 F	1	10	1	10	0.51
1012	1-butylene or	2 F	1	10	1	10	0.53
1012	trans-2-butylene or	2 F	1	10	1	10	0.54
1012	cis-2-butylene or	2 F	1	10	1	10	0.55
1012	butylenes mixture	2 F	1	10	1	10	0.50
1013	Carbon dioxide	2 A	19	190			0.73
			22.5	225			0.78
					19	190	0.66
					25	250	0.75
1016	Carbon monoxide, compressed	1 TF	see 4.3.3.2.1
1017	Chlorine	2 TOC	1.7	17	1.9	19	1.25
1018	Chlorodifluoromethane (Refrigerant gas R22)	2 A	2.4	24	2.6	26	1.03
1020	Chloropentafluoroethane (Refrigerant gas R115)	2 A	2	20	2.3	23	1.08
1021	1-chloro-1,2,2,2- tetrafluoroethane (Refrigerant gas R124)	2 A	1	10	1.1	11	1.2
1022	Chlorotrifluoromethane (Refrigerant gas R13)	2 A	12	120			0.96
			22.5	225			1.12
					10	100	0.83
					12	120	0.90
					19	190	1.04
					25	250	1.10
1023	Coal gas, compressed	TF	see 4.3.3.2.1
1026	Cyanogen	2 TF	10	100	10	100	0.70
1027	Cyclopropane	2 F	1.6	16	1.8	18	0.53

UN No.	Name	Classification code	Minimum test pressure for tanks				Maximum permissible mass of contents per litre of capacity
			With thermal insulation		Without thermal insulation		Maximum permissible mass of contents per litre of capacity
			MPa	bar	MPa	bar	kg
1028	Dichlorodifluoromethane (Refrigerant gas R12)	2 A	1.5	15	1.6	16	1.15
1029	Dichlorofluoromethane (Refrigerant gas R21)	2 A	1	10	1	10	1.23
1030	1,1-difluoroethane (Refrigerant gas R152a)	2 F	1.4	14	1.6	16	0.79
1032	Dimethylamine, anhydrous	2 F	1	10	1	10	0.59
1033	Dimethyl ether	2 F	1.4	14	1.6	16	0.58
1035	Ethane	2 F	12	120			0.32
					9.5	95	0.25
					12	120	0.29
					30	300	0.39
1036	Ethylamine	2 F	1	10	1	10	0.61
1037	Ethyl chloride	2 F	1	10	1	10	0.8
1038	Ethylene, refrigerated liquid	3 F	see 4.3.3.2.4
1039	Ethyl methyl ether	2 F	1	10	1	10	0.64
1040	Ethylene oxide with nitrogen up to a total pressure of 1MPa (10 bar) at 50 °C	2 TF	1.5	15	1.5	15	0.78
1041	Ethylene oxide and carbon dioxide mixture, with more than 9% but not more than 87% ethylene oxide	2 F	2.4	24	2.6	26	0.73
1046	Helium, compressed	1 A	see 4.3.3.2.1
1048	Hydrogen bromide, anhydrous	2 TC	5	50	5.5	55	1.54
1049	Hydrogen, compressed	1 F	see 4.3.3.2.1
1050	Hydrogen chloride, anhydrous	2 TC	12	120			0.69
					10	100	0.30
					12	120	0.56
					15	150	0.67
					20	200	0.74
1053	Hydrogen sulphide	2 TF	4.5	45	5	50	0.67
1055	Isobutylene	2 F	1	10	1	10	0.52
1056	Krypton, compressed	1 A	see 4.3.3.2.1
1058	Liquefied gases, non flammable, charged with nitrogen, carbon dioxide or air	2 A	1.5  filling pressure see 4.3.3.2.2 or 4.3.3.2.3
1060	Methylacetylene and propadiene mixture, stabilized:	2 F	see 4.3.3.2.2 or 4.3.3.2.3
	mixture P1	2 F	2.5	25	2.8	28	0.49
	mixture P2	2 F	2.2	22	2.3	23	0.47
	propadiene with 1% to 4% methylacetylene	2 F	2.2	22	2.2	22	0.50
1061	Methylamine, anhydrous	2 F	1	10	1.1	11	0.58
1062	Methyl bromide with not more than 2% chloropicrin	2 T	1	10	1	10	1.51
1063	Methyl chloride (Refrigerant gas R40)	2 F	1.3	13	1.5	15	0.81
1064	Methyl mercaptan	2 TF	1	10	1	10	0.78
1065	Neon, compressed	1 A	see 4.3.3.2.1
1066	Nitrogen, compressed	1 A	see 4.3.3.2.1
1067	Dinitrogen tetroxide (nitrogen dioxide)	2 TOC	only in battery-vehicles and MEGCs composed of receptacles
1070	Nitrous oxide	2 O	22.5	225			0.78
					18	180	0.68
					22.5	225	0.74
					25	250	0.75
1071	Oil gas, compressed	1 TF	see 4.3.3.2.1
1072	Oxygen, compressed	1 O	see 4.3.3.2.1

UN No.	Name	Classification code	Minimum test pressure for tanks				Maximum permissible mass of contents per litre of capacity
			With thermal insulation		Without thermal insulation		Maximum permissible mass of contents per litre of capacity
			MPa	bar	MPa	bar	kg
1073	Oxygen, refrigerated liquid	3 O	see 4.3.3.2.4
1075	Petroleum gases, liquefied	2 F	See 4.3.3.2.2 or 4.3.3.2.3
1076	Phosgene	2 TC	only in battery-vehicles and MEGCs composed of receptacles
1081	Tetrafluoroethylene, stabilized	2 F	only in battery-vehicles and MEGCs composed of seamless receptacles
1077	Propylene	2 F	2.5	25	2.7	27	0.43
1078	Refrigerant gases, n.o.s. such as:	2 A
	mixture F1	2 A	1	10	1.1	11	1.23
	mixture F2	2 A	1.5	15	1.6	16	1.15
	mixture F3	2 A	2.4	24	2.7	27	1.03
	other mixtures	2 A	see 4.3.3.2.2 or 4.3.3.2.3
1079	Sulphur dioxide	2 TC	1	10	1.2	12	1.23
1080	Sulphur hexafluoride	2 A	12	120			1.34
					7	70	1.04
					14	140	1.33
					16	160	1.37
1082	Trifluorochloroethylene, stabilized (Refrigerant gas R1113)	2 TF	1.5	15	1.7	17	1.13
1083	Trimethylamine, anhydrous	2 F	1	10	1	10	0.56
1085	Vinyl bromide, stabilized	2 F	1	10	1	10	1.37
1086	Vinyl chloride, stabilized	2 F	1	10	1.1	11	0.81
1087	Vinyl methyl ether, stabilized	2 F	1	10	1	10	0.67
1581	Chloropicrin and methyl bromide mixture with more than 2% chloropicrin	2 T	1	10	1	10	1.51
1582	Chloropicrin and methyl chloride mixture	2 T	1.3	13	1.5	15	0.81
1612	Hexaethyl tetraphosphate and compressed gas mixture	1 T	see 4.3.3.2.1
1749	Chlorine trifluoride	2 TOC	3	30	3	30	1.40
1858	Hexafluoropropylene (Refrigerant gas R 1216)	2A	1.7	17	1.9	19	1.11
1859	Silicon tetrafluoride	2 TC	20 30	200 300	20 30	200 300	0.74 1.10
1860	Vinyl fluoride, stabilized	2 F	12	120			0.58
			22.5	225			0.65
					25	250	0.64
1912	Methyl chloride and methylene chloride mixture	2 F	1.3	13	1.5	15	0.81
1913	Neon, refrigerated liquid	3 A	see 4.3.3.2.4
1951	Argon, refrigerated liquid	3 A	see 4.3.3.2.4
1952	Ethylene oxide and carbon dioxide mixture, with not more than 9% ethylene oxide	2 A	19	190	19	190	0.66
1952		2 A	25	250	25	250	0.75
1953	Compressed gas, toxic, flammable, n.o.s.a	1 TF	see 4.3.3.2.1 or 4.3.3.2.2
1954	Compressed gas, flammable n.o.s.	1 F	see 4.3.3.2.1 or 4.3.3.2.2
1955	Compressed gas, toxic, n.o.s.a	1 T	see 4.3.3.2.1 or 4.3.3.2.2
1956	Compressed gas, n.o.s.	1 A	see 4.3.3.2.1 or 4.3.3.2.2
1957	Deuterium, compressed	1 F	see 4.3.3.2.1
1958	1,2-dichloro-1,1,2,2-tetrafluoroethane (Refrigerant gas R114)	2 A	1	10	1	10	1.3
1959	1,1-difluoroethylene (Refrigerant gas R1132a)	2 F	12	120			0.66
1959	1,1-difluoroethylene (Refrigerant gas R1132a)	2 F	22.5	225			0.78

a Allowed if LC50 equal to or greater than 200 ppm.

UN No.	Name	Classification code	Minimum test pressure for tanks				Maximum permissible mass of contents per litre of capacity
			With thermal insulation		Without thermal insulation		Maximum permissible mass of contents per litre of capacity
			MPa	bar	MPa	bar	kg
					25	250	0.77
1961	Ethane, refrigerated liquid	3 F	see 4.3.3.2.4
1962	Ethylene	2 F	12	120			0.25
			22.5	225			0.36
					22.5	225	0.34
					30	300	0.37
1963	Helium, refrigerated liquid	3 A	see 4.3.3.2.4
1964	Hydrocarbon gas mixture, compressed, n.o.s.	1 F	see 4.3.3.2.1 or 4.3.3.2.2
1965	Hydrocarbon gas mixture, liquefied, n.o.s.:	2 F
	Mixture A	2 F	1	10	1	10	0.50
	Mixture A01	2 F	1.2	12	1.4	14	0.49
	Mixture A02	2 F	1.2	12	1.4	14	0.48
	Mixture A0	2 F	1.2	12	1.4	14	0.47
	Mixture A1	2 F	1.6	16	1.8	18	0.46
	Mixture B1	2 F	2	20	2.3	23	0.45
	Mixture B2	2 F	2	20	2.3	23	0.44
	Mixture B	2 F	2	20	2.3	23	0.43
	Mixture C	2 F	2.5	25	2.7	27	0.42
	Other mixtures	2 F	see 4.3.3.2.2 or 4.3.3.2.3
1966	Hydrogen, refrigerated liquid	3 F	see 4.3.3.2.4
1967	Insecticide gas, toxic, n.o.s.a	2 T	see 4.3.3.2.2 or 4.3.3.2.3
1968	Insecticide gas, n.o.s.	2 A	see 4.3.3.2.2 or 4.3.3.2.3
1969	Isobutane	2 F	1	10	1	10	0.49
1970	Krypton, refrigerated liquid	3 A	see 4.3.3.2.4
1971	Methane, compressed or natural gas, compressed with high methane content	1 F	see 4.3.3.2.1
1972	Methane, refrigerated liquid or natural gas, refrigerated liquid with high methane content	3 F	see 4.3.3.2.4
1973	Chlorodifluoromethane and chloropentafluoroethane mixture with fixed boiling point, with approximately 49% chlorodifluoromethane (Refrigerant gas R502)	2 A	2.5	25	2.8	28	1.05
1974	Chlorodifluorobromomethane (Refrigerant gas R12B1)	2 A	1	10	1	10	1.61
1976	Octafluorocyclobutane (Refrigerant gas RC318)	2 A	1	10	1	10	1.34
1977	Nitrogen, refrigerated liquid	3 A	see 4.3.3.2.4
1978	Propane	2 F	2.1	21	2.3	23	0.42
1982	Tetrafluoromethane (Refrigerant gas R14)	2 A	20	200	20	200	0.62
1982	Tetrafluoromethane (Refrigerant gas R14)	2 A	30	300	30	300	0.94
1983	1-chloro-2,2,2-trifluoroethane (Refrigerant gas R133a)	2 A	1	10	1	10	1.18
1984	Trifluoromethane (Refrigerant gas R23)	2 A	19	190			0.92
			25	250			0.99
					19	190	0.87
					25	250	0.95
2034	Hydrogen and methane mixture, compressed	1 F	see 4.3.3.2.1
2035	1,1,1-trifluoroethane (Refrigerant gas R143a)	2 F	2.8	28	3.2	32	0.79
2036	Xenon	2 A	12	120			1.30
2036	Xenon	2 A			13	130	1.24
2044	2,2-dimethylpropane	2 F	1	10	1	10	0.53

UN No.	Name	Classification code	Minimum test pressure for tanks				Maximum permissible mass of contents per litre of capacity
			With thermal insulation		Without thermal insulation		Maximum permissible mass of contents per litre of capacity
			MPa	bar	MPa	bar	kg
2073	Ammonia solutions, relative density less than 0.880 at 15 °C in water:	4 A
	with more than 35% and not more than 40% ammonia	4 A	1	10	1	10	0.80
	with more than 40% and not more than 50% ammonia	4 A	1.2	12	1.2	12	0.77
2187	Carbon dioxide, refrigerated liquid	3 A	see 4.3.3.2.4
2189	Dichlorosilane	2 TFC	1	10	1	10	0.90
2191	Sulfuryl fluoride	2 T	5	50	5	50	1.1
2193	Hexafluoroethane (Refrigerant gas R116)	2 A	16	160			1.28
			20	200			1.34
					20	200	1.10
2197	Hydrogen iodide, anhydrous	2 TC	1.9	19	2.1	21	2.25
2200	Propadiene, stabilized	2 F	1.8	18	2.0	20	0.50
2201	Nitrous oxide, refrigerated liquid	3 O	see 4.3.3.2.4
2203	Silane b	2 F	22.5	225	22.5	225	0.32
2203	Silane b	2 F	25	250	25	250	0.36
2204	Carbonyl sulphide	2 TF	2.7	27	3.0	30	0.84
2417	Carbonyl fluoride	2 TC	20	200	20	200	0.47
2417	Carbonyl fluoride	2 TC	30	300	30	300	0.70
2419	Bromotrifluoroethylene	2 F	1	10	1	10	1.19
2420	Hexafluoroacetone	2 TC	1.6	16	1.8	18	1.08
2422	Octafluorobut-2-ene (Refrigerant gas R1318)	2 A	1	10	1	10	1.34
2424	Octafluoropropane (Refrigerant gas R218)	2 A	2.1	21	2.3	23	1.07
2451	Nitrogen trifluoride	2 O	20	200	20	200	0.50
2451	Nitrogen trifluoride	2 O	30	300	30	300	0.75
2452	Ethylacetylene, stabilized	2 F	1	10	1	10	0.57
2453	Ethyl fluoride (Refrigerant gas R161)	2 F	2.1	21	2.5	25	0.57
2454	Methyl fluoride (Refrigerant gas R41)	2 F	30	300	30	300	0.36
2517	1-chloro-1,1-difluoroethane (Refrigerant gas R142b)	2 F	1	10	1	10	0.99
2591	Xenon, refrigerated liquid	3 A	see 4.3.3.2.4
2599	Chlorotrifluoromethane and trifluoromethane, azeotropic mixture with approximately 60% chlorotrifluoromethane (Refrigerant gas R503)	2 A	3.1	31	3.1	31	0.11
			4.2	42			0.21
			10	100			0.76
					4.2	42	0.20
					10	100	0.66
2601	Cyclobutane	2 F	1	10	1	10	0.63
2602	Dichlorodifluoromethane and difluoro-1,1 ethane, azeotropic mixture with approximately 74% dichlorodifluoromethane (Refrigerant gas R500)	2 A	1.8	18	2	20	1.01
2901	Bromine chloride	2 TOC	1	10	1	10	1.50
3057	Trifluoroacetyl chloride	2 TC	1.3	13	1.5	15	1.17
3070	Ethylene oxide and dichlorodifluoromethane mixture with not more than 12.5% ethylene oxide	2 A	1.5	15	1.6	16	1.09
3083	Perchloryl fluoride	2 TO	2.7	27	3.0	30	1.21
3136	Trifluoromethane, refigerated liquid	3 A	See 4.3.3.2.4

b Considered as pyrophoric.

UN No.	Name	Classification code	Minimum test pressure for tanks				Maximum permissible mass of contents per litre of capacity
			With thermal insulation		Without thermal insulation		Maximum permissible mass of contents per litre of capacity
			MPa	bar	MPa	bar	kg
3138	Ethylene, acetylene propylene in mixture, refrigerated liquid, containing at least 71.5% ethylene with not more than 22.5% acetylene and not more than 6% propylene	3 F	see 4.3.3.2.4
3153	Perfluoro(methyl vinyl ether)	2 F	1.4	14	1.5	15	1.14
3154	Perfluoro(ethyl vinyl ether)	2 F	1	10	1	10	0.98
3156	Compressed gas, oxidizing, n.o.s.	1 O	see 4.3.3.2.1 or 4.3.3.2.2
3157	Liquefied gas, oxidizing, n.o.s.	2 O	see 4.3.3.2.2 or 4.3.3.2.3
3158	Gas, refrigerated liquid, n.o.s.	3 A	see 4.3.3.2.4
3159	1,1,1,2-tetrafluoroethane (Refrigerant gas R134a)	2 A	1.6	16	1.8	18	1.04
3160	Liquefied gas, toxic, flammable, n.o.s. a	2 TF	see 4.3.3.2.2 or 4.3.3.2.3
3161	Liquefied gas, flammable, n.o.s.	2 F	see 4.3.3.2.2 or 4.3.3.2.3
3162	Liquefied gas, toxic, n.o.s. a	2 T	see 4.3.3.2.2 or 4.3.3.2.3
3163	Liquefied gas, n.o.s.	2 A	see 4.3.3.2.2 or 4.3.3.2.3
3220	Pentafluoroethane (Refrigerant gas R125)	2 A	4.1	41	4.9	49	0.95
3252	Difluoromethane (Refrigerant gas R32)	2 F	3.9	39	4.3	43	0.78
3296	Heptafluoropropane (Refrigerant gas R227)	2 A	1.4	14	1.6	16	1.20
3297	Ethylene oxide and chlorotetrafluoroethane mixture, with not more than 8.8% ethylene oxide	2 A	1	10	1	10	1.16
3298	Ethylene oxide and pentafluoroethane mixture, with not more than 7.9% ethylene oxide	2 A	2.4	24	2.6	26	1.02
3299	Ethylene oxide and tetrafluoroethane mixture, with not more than 5.6% ethylene oxide	2 A	1.5	15	1.7	17	1.03
3300	Ethylene oxide and carbon dioxide mixture, with more than 87% ethylene oxide	2 TF	2.8	28	2.8	28	0.73
3303	Compressed gas, toxic, oxidizing, n.o.s.a	1 TO	see 4.3.3.2.1 or 4.3.3.2.2
3304	Compressed gas, toxic, corrosive, n.o.s.a	1 TC	see 4.3.3.2.1 or 4.3.3.2.2
3305	Compressed gas, toxic, flammable, corrosive, n.o.s. a	1 TFC	see 4.3.3.2.1 or 4.3.3.2.2
3306	Compressed gas, toxic, oxidizing, corrosive, n.o.s. a	1 TOC	see 4.3.3.2.1 or 4.3.3.2.2
3307	Liquefied gas, toxic, oxidizing, n.o.s. a	2 TO	see 4.3.3.2.2 or 4.3.3.2.3
3308	Liquefied gas, toxic, corrosive, n.o.s. a	2 TC	see 4.3.3.2.2 or 4.3.3.2.3
3309	Liquefied gas, toxic, flammable, corrosive, n.o.s. a	2 TFC	see 4.3.3.2.2 or 4.3.3.2.3
3310	Liquefied gas, toxic, oxidizing, corrosive, n.o.s. a	2 TOC	see 4.3.3.2.2 or 4.3.3.2.3
3311	Gas, refrigerated liquid, oxidizing, n.o.s.	3 O	see 4.3.3.2.4
3312	Gas, refrigerated liquid, flammable, n.o.s.	3 F	see 4.3.3.2.4
3318	Ammonia solutions, relative density less than 0.880 at 15 °C in water, with more than 50% ammonia	4 TC	see 4.3.3.2.2
3337	Refrigerant gas R404A	2 A	2.9	29	3.2	32	0.84
3338	Refrigerant gas R407A	2 A	2.8	28	3.2	32	0.95
3339	Refrigerant gas R407B	2 A	3.0	30	3.3	33	0.95

a Allowed if LC50 equal to or greater than 200 ppm.

UN No.	Name	Classification code	Minimum test pressure for tanks				Maximum permissible mass of contents per litre of capacity
			With thermal insulation		Without thermal insulation
			MPa	bar	MPa	bar	kg
3340	Refrigerant gas R407C	2 A	2.7	27	3.0	30	0.95
3354	Insecticide gas, flammable, n.o.s.	2 F	see 4.3.3.2.2 or 4.3.3.2.3
3355	Insecticide gas, toxic, flammable, n.o.s.a	2 TF	see 4.3.3.2.2 or 4.3.3.2.3

a Allowed if LC50 equal to or greater than 200 ppm.‌

When tanks, batteryvehicles

or MEGCs are approved for different gases, the change of use shall

include emptying, purging and evacuation operations to the extent necessary for safe operation.

When tanks, batteryvehicles

or MEGCs are handed over for carriage, only the particulars specified in

6.8.3.5.6 applicable to the gas loaded or just discharged shall be visible; all particulars concerning

other gases shall be covered up.

All the elements of a batteryvehicle

or MEGC shall contain only one and the same gas.

When the external overpressure could be greater than the tank resistance to external pressure (e.g. due

to low ambient temperatures), adequate measures shall be taken to protect tanks carrying low pressure

liquefied gases against the risk of deformation, e.g. by filling them with nitrogen or another inert gas

in order to maintain sufficient pressure inside the tank.

(Reserved)

The actual holding time shall be determined for

each journey of a tank-container carrying a

refrigerated liquefied gas on the basis of the

following:

(a) The reference holding time for the

refrigerated liquefied gas to be carried (see

6.8.3.4.10) as indicated on the plate referred

to in 6.8.3.5.4;

(b) The actual filling density;

(c) The actual filling pressure;

(d) The lowest set pressure of the pressure

limiting device(s);

(e) The deterioration of the insulation4.

NOTE: ISO 21014:2006 ‘Cryogenic vessels –

Cryogenic insulation performance’ details methods

of determining the insulation performance of

cryogenic vessels and provides a method of

calculating the holding time.

The date at which the actual holding time ends shall

be entered in the transport document (see 5.4.1.2.2.

(d)).

Tank-containers shall not be offered for carriage:

(a) In an ullage condition liable to produce an

unacceptable hydraulic force due to surge

within the shell;

(b) When leaking;

(c) When damaged to such an extent that the

integrity of the tank-container or its lifting or

securing arrangements may be affected;

(d) Unless the service equipment has been

examined and found to be in good working

order;

(e) Unless the actual holding time for the

refrigerated liquefied gas being carried has

been determined;

(f) Unless the duration of carriage, after taking

into consideration any delays which might be

encountered, does not exceed the actual

holding time;

(g) Unless the pressure is steady and has been

lowered to a level such that the actual holding

time may be achieved4.

4 Guidance is provided in the European Industrial Gases Association (EIGA) document “Methods to prevent the

premature activation of relief devices on tanks” available at www.eiga.eu.

4.3.3.1.2

Hierarchy of tanks

4.3.3.2

Filling conditions and test pressures

4.3.3.2.1

4.3.3.2.2

4.3.3.2.3

4.3.3.2.4

4.3.3.2.5

b Considered as pyrophoric.

4.3.3.3

Operation

4.3.3.3.1

4.3.3.3.2

4.3.3.3.3

4.3.3.3.4

4.3.3.4

4.3.3.5

4.3.4

Special provisions applicable to Classes 1 and 3 to 9