Storage tanks are frequently used to provide extra filling capacity during peak periods. The storage cylinders can either be opened all at once in a single stage, or cascaded into the cylinders to be filled, usually in 3 stages. Ideally the storage pressure should be higher than the filling pressure, 300 bar storage systems are the most common. The storage systems can be used with most compressors and are best suited for automatic operation (e.g. ECC or auto start option). L&W has a full range of storage modules each of which can be combined with other modules for individual configuration.