Knowing how to inspect a screw compressor before container loading is the difference between a clean handover and an ocean-freight claim. A wrong bench report, a loose drain plug, or an unsecured airend can leave you with a rejected shipment at the destination port and weeks of production downtime. Run this pre-loading checklist so the unit you approved at the factory is the unit that actually arrives.
Check the Bench Report Against the Nameplate
Start with the numbers, not the paint job. The test report proves the machine performs as ordered before it is loaded. Compare the recorded specific power with a known benchmark: Panrui industry comparison data shows a 90 kW two-stage unit can reach about 5.9 كيلوواط/(م3/دقيقة), while a 90 kW single-stage machine typically sits near 7.0 كيلوواط/(م3/دقيقة). A wide gap means more electricity for the same air volume, so stop the loading and request a retest. Ask the factory to run a short loaded cycle while you watch the controller, so the delivered figures match the nameplate under load.
- Confirm motor kW, working pressure, and free air delivery match the purchase order.
- Check specific power against the 5.9 كيلوواط/(م3/دقيقة) two-stage reference for a 90 kW class machine.
- Match the frame serial number to the packing list and invoice.
- Reject any test report that is not dated, signed, or labeled with the correct model.
Walk the Machine for Fluid and Fitting Risks
Shipping damage usually begins with fluids and loose fittings. An oil-injected screw compressor leaves the factory with the airend and separator tank under pressure, so a small leak becomes a serious problem during weeks at sea. Check for wet spots around the airend, separator tank, and pipe joints, and confirm every valve is closed and every drain plug is tight. Also confirm the cabinet doors close fully and the intake filter is clean; a gap can let salt spray reach the electrical bay during ocean transit.
- Inspect the airend, oil separator tank, and hose joints for fresh oil or coolant stains.
- Confirm the oil level sits inside the sight-glass range and the oil type matches the manual.
- Verify the intake valve, pressure switch, and drain valve are secured.
- Remove or strap down loose accessories so nothing shifts inside the container.
- Confirm the unit is bolted to its shipping base and lifting points are marked.
Photograph the Evidence Before the Container Seals
Once the container door closes, your ability to dispute what was loaded disappears. Photograph the serial plate, the test report, the oil sight glass, and all four sides of the package before sealing. A complete photo set is the fastest way to settle a port-inspection dispute.
Treat this as a repeatable standard rather than a one-off. A Shenzhen plastics factory that received three 37 kW two-stage screw compressors applied the same loading routine to all three units, keeping nameplate data, oil levels, and paperwork consistent across the shipment.
Also confirm the paperwork covers delivery and after-sales. Panrui screw compressors ship with a two-year whole-machine warranty, double the common one-year industry standard, and flagship units include remote IoT monitoring. Record the warranty start date and the service contact on the delivery note before the unit leaves the yard.
التعليمات: Common Container-Loading Mistakes
- Should I test-run the machine at loading? A short loaded run is ideal, but only after confirming oil and coolant levels. A dry or overfilled unit can fail before the vessel leaves port.
- What if the specific power is slightly higher? Allow normal test tolerance, but question any 90 kW class result far above the 7.0 كيلوواط/(م3/دقيقة) single-stage reference.
- Who pays for transit damage? Under FOB, risk often passes at loading; under DDP, it passes at destination. Confirm the Incoterm and insurance before sealing.
- When should I schedule the inspection? One or two days before loading is best, after the factory test run and before final packaging, so corrections can be made without delaying the vessel.
Done right, one hour of pre-loading inspection protects a six-figure compressed air investment and keeps your production start date on track. Compare variable-speed models or اتصل بفريق Panrui to arrange a live video inspection of your next screw compressor shipment.
