GB/T 26978.4-2011 Design and manufacture of site built,vertical,cylindrical,flat-bottomed steel tanks for the storage of liquefied natural gases—Part 4:Insulation components

Scope

This section specifies the insulation materials, insulation design, and installation requirements for liquefied natural gas (LNG) storage tanks.
LNG storage tanks are used to store liquefied natural gas with a low boiling point, i.e., below the normal ambient temperature.
The storage of such liquid products in atmospheric pressure tanks depends on the combination of latent heat of vaporization and insulation.
Therefore, the insulation system of LNG storage tanks is an important component of the storage system, rather than just an auxiliary part of the storage system (for most hydrocarbon storage tanks under ambient pressure). Without proper design, installation, and maintenance, the storage tanks will not function properly.
The main functions of insulation in LNG storage tanks include:
——Maintaining evaporation below a specified limit;
——Protecting the non-cryogenic components/materials of the storage tanks (mainly the exterior of the storage tanks) and keeping them at the required ambient temperature;
——Limiting the cooling of the foundation/soil at the bottom of the storage tanks to avoid damage due to frost heaving;
——Preventing and minimizing the condensation and freezing of water vapor on the exterior surface of the storage tanks.
There are many types of insulation materials available. However, the properties of materials vary greatly among different categories, and even within the same category, the differences can be significant.
Therefore, this section only provides general guidance on the selection of materials.

Development Information

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Superseded by the following standards

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