A successful PSA nitrogen generator installation starts weeks before the equipment arrives. Poor site preparation is the #1 cause of delayed commissioning and post-installation performance issues. This guide covers everything you need to prepare — from foundation specs to utility connections to the commissioning checklist.
Site Requirements
| Requirement | Details |
|---|---|
| Floor space | PSA unit: 2×2 m (for 50 Nm³/h). Add 1×1 m for each accessory (dryer, buffer tank, filter skid). Minimum 1 m clearance around all sides for servicing. |
| Floor loading | Minimum 500 kg/m². A 50 Nm³/h system weighs approximately 800-1,200 kg. Heavier units may need reinforced concrete. |
| Ventilation | Compressor room: minimum 20 air changes/hour. PSA unit: natural convection is sufficient if ambient stays below 45°C. |
| Ambient temperature | 5-45°C operating range. Below 5°C: add trace heating. Above 45°C: add forced ventilation or air conditioning. |
| Indoor/outdoor | Indoor preferred. Outdoor units need weatherproof enclosure (standard on containerized models). |
| Lighting | Minimum 300 lux at service points for safe maintenance work. |
Utility Requirements (50 Nm³/h Example)
| Utility | Specification |
|---|---|
| Electrical supply | 380-480V, 3-phase, 50/60 Hz. 22 kW for compressor + 0.5 kW for PSA controller. Dedicated circuit with 63A breaker. |
| Compressed air feed | 7.5 m³/min @ 7-10 bar (for 50 Nm³/h PSA with 40% recovery). Oil-free Class 0 per ISO 8573-1. |
| Cooling water (if water-cooled) | Not typically needed. Air-cooled aftercooler is standard for most systems up to 200 Nm³/h. |
| Drain connection | DN25 (1") drain line for condensate from dryer and filters. Route to oily water separator. |
| Instrument air | 5-7 bar, clean dry air for pneumatic valves. Can be taken from the main compressed air supply. |
Foundation Preparation
- Concrete pad: 150 mm minimum thickness, reinforced with rebar grid. Allow 300 mm extra on all sides beyond equipment footprint.
- Anchor bolts: M16×200 mm expansion bolts or cast-in-place per equipment drawing. Use template provided by manufacturer.
- Vibration isolation: 10 mm rubber isolation pads under compressor feet. PSA skid typically doesn't need additional isolation.
- Leveling: ±2 mm over full skid length. Use shims under base frame during installation.
- Curing time: Minimum 7 days for concrete before equipment placement.
Piping Requirements
| Service | Pipe Size | Material | Notes |
|---|---|---|---|
| Compressed air supply | DN40 (1½") | Galvanized steel or stainless | Maximum 50 m from compressor; larger pipe for longer runs |
| Nitrogen product | DN25 (1") | Stainless steel 304/316 | Pickled and passivated; no copper or brass |
| Condensate drain | DN25 (1") | PVC or galvanized | Slope 1:100 toward drain point |
| Vent/purge exhaust | DN50 (2") | Galvanized steel | Route to outside; oxygen-enriched air (25% O₂) |
Commissioning Checklist
Before turning the system on, verify each item:
- Electrical: Voltage within ±5% of nameplate. Phase rotation correct. Grounding verified (<1 ohm).
- Compressed air: Pressure at PSA inlet 7-10 bar. Flow capacity adequate (add 20% margin). Air quality verified (oil-free, dry).
- Piping: All connections tightened. No leaks at 1.1× operating pressure. Nitrogen pipe thoroughly cleaned and dried.
- Drain: Auto drains connected and functional. Condensate management system ready.
- Valves: Manual valves in correct position. Solenoid valves cycle freely. Safety relief valves installed and tested.
- Sensors: O₂ analyzer calibrated. Pressure transmitters zeroed. Flow meter configured for N₂.
- Control: PLC program loaded. Setpoints entered (pressure, purity, cycle times). Alarm thresholds configured.
- Documentation: Operating manual on site. Maintenance log book ready. Emergency shutdown procedure posted.
Commissioning typically takes 1-2 days with a qualified technician. After start-up, let the system stabilize for 2-3 full cycles before connecting to your process line. Monitor purity for 24 hours before full production use.
Typical Installation Timeline
| Phase | Duration | Who |
|---|---|---|
| Site survey | 1 day | Supplier engineer (remote or on-site) |
| Foundation preparation | 1-2 weeks | Customer (concrete cure time) |
| Utility installation (electrical/piping) | 3-5 days | Customer electrician + pipefitter |
| Equipment delivery & placement | 1 day | Customer + crane if needed |
| Connection & commissioning | 1-2 days | Supplier technician |
| Operator training | 4 hours | Supplier technician |
| Total (from delivery to production) | 3-5 days |
Planning an installation? Tell us your site specs → — we'll verify compatibility and provide a pre-installation site checklist tailored to your system.