Storage tanks are highly critical components of an LNG plant. LNG tanks can be categorized from different aspects:

– Fix or on carrier tanks

– Containment type

– Above ground, in-ground types & underground

Fixed storage tanks are normally made with 4 main containment types:

• Single containment: This tank has an inner tank made of 9 % nickel and an outer tank made carbon steel. In case of leakage there is no protection other than having a large construction free area. For this reason, this type of tank is not used for a long time.
• Double containment: This type has a secondary containment steel or concrete dike wall close to the vapor containing the outer tank.
• Full containment: This type has a 9 % nickel inner tank and a concrete outer tank which allows leakage to exit only from the roof. This is the most constructed LNG tank type and requires much less land.
• Membrane type: This type – which is mainly an in-ground or underground type – uses a membrane cladding of stainless steel on the insulation and a concrete outer tank. The construction cost of this type is high – as such this design is applied when very limited land is available.