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Step 1: Define Your Outlet Pressure Requirement<\/h2>\n
The outlet pressure is the single most important parameter because it determines the number of compression stages and \u2014 by extension \u2014 the physical size, motor power class and price of the machine.<\/p>\n
Oxygen booster compressors are typically applied in the following pressure bands:<\/p>\n
| Application<\/th>\n | Outlet Pressure<\/th>\n | Typical Stages<\/th>\n<\/tr>\n<\/thead>\n |
|---|---|---|
| PSA\/VPSA oxygen distribution ring main<\/td>\n | 0.2 \u2013 0.8 MPa (2 \u2013 8 bar)<\/td>\n | 1 \u2013 2 stages<\/td>\n<\/tr>\n |
| Laser cutting oxygen assist gas<\/td>\n | 1.0 \u2013 1.6 MPa (10 \u2013 16 bar)<\/td>\n | 2 stages<\/td>\n<\/tr>\n |
| Steel mill \/ glass furnace oxygen pipeline<\/td>\n | 3.0 \u2013 3.5 MPa (30 \u2013 35 bar)<\/td>\n | 3 \u2013 4 stages<\/td>\n<\/tr>\n |
| Industrial \/ medical oxygen cylinder filling<\/td>\n | 15.0 MPa (150 bar)<\/td>\n | 4 \u2013 5 stages<\/td>\n<\/tr>\n |
| High-fill-density cylinder filling<\/td>\n | 16.5 MPa (165 bar)<\/td>\n | 5 stages<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n There is a gap between 16 bar and 30 bar that most standard catalogue machines do not cover with a single configuration. If your process requires something in that intermediate range, tell us \u2014 a custom stage ratio configuration can be engineered.<\/p>\n Step 2: Establish Your Inlet Pressure and Its Variability<\/h2>\nInlet pressure is the second critical parameter. It determines the compression ratio across the first stage and affects whether the machine will operate stably across your full operating range.<\/p>\n \u26a0\ufe0f PSA inlet variability is the most common source of specification errors.<\/strong> A PSA oxygen generator does not produce a steady outlet pressure \u2014 it cycles between adsorption and regeneration, producing a pressure that can vary by 0.3 to 0.8 bar within each cycle. If you specify the booster at the maximum PSA outlet pressure and the actual minimum drops below the booster’s inlet low-pressure cutoff, the machine will trip repeatedly during operation.<\/p>\n The correct approach:<\/p>\n For liquid oxygen vaporiser supply, inlet pressure is typically stable at 0.1 to 0.4 MPa and this variability concern does not apply.<\/p>\n Flow rate must be calculated at inlet conditions<\/strong>, not at standard conditions or outlet conditions \u2014 compressor displacement is fixed at inlet volume. The conversion between standard Nm\u00b3\/h and actual inlet m\u00b3\/min depends on inlet temperature and pressure.<\/p>\n For a cylinder filling station, the calculation is straightforward:<\/p>\n For pipeline supply applications, sum the peak simultaneous demand across all end users and add 20% for contingency. Do not use average demand as your design flow \u2014 the compressor must serve peak demand.<\/p>\n The number of compression stages is determined by the inlet-to-outlet pressure ratio. A fundamental rule in reciprocating compressor design is that each stage should not exceed a compression ratio of approximately 3.5 to 4:1. For oxygen (specific heat ratio \u03b3 \u2248 1.4), this limits the temperature rise per stage to below 160\u00b0C in normal industrial service.<\/p>\n Exceeding this ratio in a single stage produces excessive discharge temperatures that degrade piston rings faster, increase valve wear and \u2014 in oxygen service \u2014 raise the combustion risk from any trace contaminants.<\/p>\n How this applies in practice:<\/p>\n Inter-stage coolers (water-cooled tube-and-shell heat exchangers) are installed between every stage. They reduce the gas temperature back toward ambient before it enters the next stage, improve volumetric efficiency, and remove condensed moisture via automatic drain separators. We fit inter-stage cooling on all models above 18.5 kW as standard.<\/p>\n Water cooling is standard on all compressors above 30 kW. You need to confirm:<\/p>\n Air-cooled configurations are available on smaller ZW series models (below approximately 37 kW) where site cooling water is not available. Air-cooled machines are larger and noisier than water-cooled equivalents at the same power.<\/p>\n All cylinder filling and medium-pressure models in our range operate on standard 380V \/ 50Hz three-phase supply. No high-voltage transformer, no specialist switchgear, and no additional electrical infrastructure beyond a standard industrial supply connection.<\/p>\n Large-capacity high-pressure models (DW and 4MW series above approximately 500 kW) use 6kV or 10kV supply, which is appropriate for facilities \u2014 such as steel mills or large chemical parks \u2014 that already have high-voltage infrastructure on site.<\/p>\n Our machines are designated by frame type (ZW, LW, DW, 4MW) which indicates the cylinder layout:<\/p>\n Frame selection is determined by the combination of flow rate, outlet pressure and site constraints. We handle this selection as part of our application engineering review \u2014 you provide the process parameters and site constraints, and we recommend the appropriate configuration.<\/p>\n To receive a complete technical recommendation and commercial proposal, the following information allows us to respond within one business day:<\/p>\n We do not provide generic datasheets in response to vague enquiries \u2014 every recommendation we make is based on a specific set of process parameters. Contact our engineering team<\/a> and let us demonstrate what a proper application review looks like.<\/p>\n Selecting the right oxygen booster compressor follows a clear sequence: outlet pressure determines stage count \u2192 inlet pressure determines first-stage ratio and trip setting \u2192 flow rate determines frame size \u2192 cooling availability determines cooler design \u2192 power supply determines motor voltage class. Each variable depends on the one before it. Working through them in this order prevents the most common specification errors we encounter \u2014 particularly the PSA inlet variability issue and the conflation of standard-condition flow with inlet-condition displacement.<\/p>\n |
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