LNG Cryogenic Tank Containers

LNG Cryogenic Tank Containers

How to Prevent Corrosion of Cryogenic Liquid Tank?

A pressure vessel is a closed device that holds a gas or liquid and carries a certain pressure. Pressure vessels are used in a wide range of applications and have important positions and functions in many sectors, such as industrial and civil. However, a common problem with pressure vessels in use is corrosion.

Corrosion, cracking, damage, erosion, and physical damage are all obvious failure modes of Cryogenic Liquid Tank. Therefore, be careful when using pressure vessels. Cryogenic Tank Supplier believes that there are two reasons for the corrosion of pressure vessels.

Corrosion of Cryogenic Liquid TankS
LNG Cryogenic Tank Containers

Material characteristics:
The material characteristics of the pressure vessel affect and determine its level of corrosion resistance. The surface metal crystal’s structural density and oxidizing properties will disturb the corrosion rate. The larger the crystal structure density, the rougher the surface, the larger the crystal pores, the easier the service material will penetrate, and the more likely the corrosion reaction will occur. Choosing corrosion-resistant materials is essential for constructing cryogenic liquid tanks. Stainless steel alloys, such as 304 or 316, are commonly used due to their excellent corrosion resistance, even at low temperatures. Additionally, special alloys or coatings may enhance corrosion resistance further.

Surface Coatings: Applying protective coatings on the inner and outer surfaces of cryogenic liquid tanks can provide an additional layer of defence against corrosion. Epoxy coatings, polyurethane coatings, or specialized corrosion-resistant paints can create a barrier between the tank material and the corrosive substances.

Passive Protection: Passive protection methods include corrosion inhibitors or sacrificial anodes. Corrosion inhibitors are chemicals added to the cryogenic liquid to mitigate the corrosive effects. Sacrificial anodes, typically made of zinc or magnesium, are attached to the tank and corrode sacrificially, protecting the tank material from corrosion.

Cathodic Protection: Cathodic protection is an electrochemical method that protects metal structures from corrosion. It involves connecting the cryogenic liquid tank to a sacrificial anode or an impressed current system. This process ensures that the tank acts as a cathode, preventing corrosion by diverting the corrosive reactions to the anode.

Regular Inspection and Maintenance: Regular inspections and maintenance are essential to identify and promptly address any signs of corrosion in cryogenic liquid tanks. This includes examining the tank’s surfaces, checking for coating integrity, and ensuring the proper functioning of corrosion protection systems.

External environment:
The internal and external environment of the Cryogenic Liquid Tank will directly affect its anti-corrosion performance. Pressure vessels carry many reagents, and the cost of materials is high. It is inevitable that a small number of corrosive materials, such as acidic materials and alkaline materials, may be mixed, and these components are likely to cause corrosion of the pressure vessel.

It is important to note that the specific anti-corrosion measures employed for cryogenic liquid tanks may vary depending on factors such as the type of cryogenic liquid being stored, tank design, and intended application. Consulting with experts in cryogenic engineering and following industry guidelines and standards is crucial to implementing effective anti-corrosion strategies for cryogenic liquid tanks.

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