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In focus… LNG ISO tanks

In focus… LNG ISO tanks

With so many sizes, ranges and technology types available, there are hundreds of thousands of ISO tanks in circulation around the world today, playing a fundamental role in the industries they ship product in. An ISO tank is a generic term used for a standardised, reusable shipping module that provides safe, economical and secure storage for the transportation of products within a global containerised freight transport system.

These types of tanks can be shipped by any mode of transportation – road, rail or water – and originated in the 1950s when the US military began working in conjunction with commercial shipping operators to develop an efficient, economical way to transport goods. ISO tanks have long been used for the bulk transportation of gases and chemicals, with initial use for the international transport of helium in the 1990s.

An ISO tank for LNG transportation is typically a 40ft cryogenic tank that normally consists of a jacket and one or more inner shells where the space between the shell(s) and the jacket is exhausted of air (vacuum insulation) and may incorporate a thermal insulation system.

The insulation in all systems is designed to reduce heat inleak so that the pressure will not normally rise to the set pressure of the inner vessel pressure release device (PRD) during the duration of transport. LNG ISO tanks can hold LNG, natural gas that has been refrigerated to -260°F (-162°C), for up to 70 days without any loss or boil off from the tank.

LNG by rail

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