How are the costs for filling a nitrogen cylinder related when using a PSA nitrogen? What do the costs for filling oxygen cylinders look like?
With PSA nitrogen generators, the costs for the nitrogen production and for filling cylinders is normally given in kilowatt-hours (kW/h). The reason for this is that while the air is free, there are costs for the electricity to operate the air compressor. When operating the system at sea level, approximately 10 kW/h is necessary in order to fill a 10m³ nitrogen cylinder – or in other words: 0.5 kW/h per m³. The costs for filling oxygen cylinders are subject to the same calculations.