Transporting refrigerating liquified gases of class 2

29 七月 2022

July 29, 2022 - Update 02

We would like to highlight the effects of the IMDG code amendments 40-20 that came into effect June 1st, 2022, which address the transport of refrigerated liquified gas - class 2.

When transporting portable tanks with refrigerated liquified gas of class 2, the actual holding time (the actual date) must be mentioned on the dangerous goods declaration in the following format.

END OF HOLDING TIME¹: (DD/MM/YYYY) which must be valid till end of the journey + 21 days of safety margin.
It is also required for “EMPTY UNCLEANED” and “RESIDUES”.

¹⁾Holding time means the time that will elapse from the establishment of the initial filling condition until the pressure has risen due to heat influx to the lowest set pressure of the pressure-limiting device(s). It is calculated for each journey in accordance with a procedure recognized by the competent authority, based on the following: the reference holding time for refrigerating liquefied gas to be transported, the actual filling density, the actual filling pressure and the lowest set pressure of the pressure limiting device(s).

This is important since the end holding time defines the period in which the gas can be safely transported. The holding time must be calculated for each journey in accordance with the competent authority’s recognized procedure. Additionally, it must be based on the reference holding time for the specific refrigerated liquified gas to be transported, the actual filling density, the actual filling pressure, and the lowest set pressure of the pressure-limiting device.

In addition to the above, the portable tank shall be fitted with a corrosive-resistant metal plate with holding times for each refrigerated liquified gas permitted to be transported in a portable tank. The below details must be stated on the portable tank plate: name in full of the refrigerating liquified gas, reference holding time (in days and hours), initial pressure, and degree of filling.

If you have any questions, please contact your local Maersk representative. Information for your local Maersk offices can be found at .

July 15, 2022 - Update 01

We would like to highlight the effects of the IMDG code amendments 40-20 that came into effect June 1^st, 2022, which address the transport of refrigerating liquified gases - class 2.

When transporting portable tanks with refrigerating liquified gases of class 2, the actual holding time (the actual date) must be mentioned on the Dangerous goods declaration in the following format.

END OF HOLDING TIME¹: (DD/MM/YYYY) which must be valid till end of the journey + 21 days of safety margin.
It’s also required for “EMPTY UNCLEANED” and “RESIDUES”.

¹⁾ Holding time means the time that will elapse from the establishment of the initial filling condition until the pressure has risen due to heat influx to the lowest set pressure of the pressure-limiting device(s). It is calculated for each journey in accordance with a procedure recognized by the competent authority, based on the following: the reference holding time for refrigerating liquefied gas to be trans-ported, the actual filling density, the actual filling pressure and the lowest set pressure of the pressure limiting device(s).

This is important since the end holding time defines the period in which the gas can be safely transported. The holding time must be calculated for each journey in accordance with the competent´ s authority recognized procedure; and it must be based on the reference holding time for the specific refrigerated liquified gas to be transported, the actual filling density, the actual filling pressure, and the lowest set pressure of the pressure-limiting device.

In addition to the above, the portable tank shall be fitted with a corrosive-resistant metal plate with holding times for each refrigerating liquified gas permitted to be transported in a portable tank; and the below details must be stated on the portable tank plate: name in full of the refrigerating liquified gas, reference holding time (in days and hours, initial pressure and degree of filling.

Please do not hesitate to reach out to your local Maersk representative should you have any questions.