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Automatic cascade control
Automatic cascade control systems can be customized for particular situations, including on-board trailers, at ASME storage sites, or alongside the compressor and cylinder filling manifolds. Most often a 3 or 4-zone, electrical auto-cascade system is selected because it makes operation of the storage receiver(s) and/or trailers as simple as possible. It allows the ASME receivers, DOT assembly, trailer, compressor, and cylinders to interact in the most efficient manner - thus maximizing gas product usage and minimizing gas product residual and compressor running time.
Functioning automatically and sequentially, an automatic cascade control system will typically pressure-transfer more than half of the gas - about 55% - into cylinders or storage before start-up of the off-loading compressor. This is accomplished without the use of individual cylinder hand-valves (on the tube trailer or storage bank) and it allows the specific selection of gas pressure into the user's building so that the performance of the compressor(s) being used is optimized by using suction pressures best suited for a particular machine. (For example, the highest pressures are best for the diaphragm machines and the lowest pressures are best for reciprocating machines.)