Pre‑Shipment Factory Test Protocol for Semi‑Hermetic Piston Compressor: Test Items & Acceptance Criteria

Pre‑Shipment Factory Test Protocol for Semi‑Hermetic Piston Compressor: Test Items & Acceptance Criteria

Factory testing quality controls early defects and reduces site commissioning trouble; Xiteliduo implements a multi‑stage test procedure for all piston compressors. Cold storage refrigeration compressor units undergo visual inspection, pressure leak test, no‑load run test and full‑load performance test before packing. Semi‑hermetic piston compressor helium leak test acceptance threshold is less than 0.5 g/year refrigerant leakage rate for all pressurised joints and seals. Refrigeration compressor for food cold room also gets material traceability checks, confirming wetted materials comply with indirect food contact requirements. R404A piston refrigeration compressor full‑load performance test runs at standard rating conditions for 4 hours, recording power, cooling capacity and discharge temperature. Low temperature cold storage compressor and 2‑stage piston refrigeration compressor complete extra interstage pressure stability test and low‑load simulation. Chinese refrigeration compressor manufacturer test records show 12% of hidden mechanical defects are captured during the 4‑hour full‑load aging cycle. Semi‑hermetic compressor price comparison rarely distinguishes between units with full performance test and those with only simple pressure leak checks. Refrigeration compressor fault troubleshooting for new arrivals often traces back to suppliers skipping full‑load aging and only performing quick leak testing. Cold chain refrigeration unit compressor assembled skids go through system run test, including safety interlock trips for oil pressure, temperature and high pressure. Vibration readings are logged at the crankcase during factory testing; units exceeding 4.5 mm/s RMS vibration are rejected and reworked before shipment. Xiteliduo issues each compressor a unique test report with serial number, which can be provided to buyers for project documentation and inspection purposes. The whole test workflow for a bare piston compressor takes 6–8 hours, excluding the separate salt spray or high‑temperature aging for special export variants. Units failing any test item are routed to rework and retest; no compressor is released with out‑of‑spec vibration, leak or performance parameters.

FAQ

1. What is the helium leak test acceptance limit for piston compressors? Leakage must be below 0.5 g refrigerant per year for all pressurised sealing points.
2. How long is the standard full‑load performance test duration? 4 hours of continuous full‑load running under rated test conditions.
3. What percentage of hidden defects are found during factory aging testing? Approximately 12% of latent mechanical defects are caught in full‑load aging.
4. What vibration velocity limit is used for factory acceptance? Crankcase RMS vibration must remain below 4.5 mm/s before shipment.
5. What extra test applies to two‑stage piston refrigeration compressors? Additional interstage pressure stability and low‑load simulation testing.
6. Can buyers get a test report linked to their compressor serial number? Xiteliduo provides serial‑number‑specific factory test reports for each unit.