Refrigeration Compressor Commissioning Procedure and Acceptance Standard for New Industrial Cold Storage Project

Refrigeration Compressor Commissioning Procedure and Acceptance Standard for New Industrial Cold Storage Project

Improper commissioning causes 55% of hidden early faults of new refrigeration compressor units, and incomplete acceptance leads to long-term unstable operation. Commissioning must complete vacuum pumping before refrigerant charging. System vacuum below 500 Pa removes moisture and non-condensable gas inside refrigeration circuit. Xiteliduo Refrigeration Compressors commissioning procedure requires oil level check after 4 hours continuous running. Oil level should stay in the middle of sight glass window. Commissioning startup sequence builds oil pressure first. Oil pump runs for 10–30 seconds before motor startup to form complete lubricating film on rotor and bearing surfaces. Transient pressure alarm is suppressed for 30 seconds during startup. It avoids false alarm caused by normal pressure spike in compressor initial compression stage. Commissioning load test includes full-load continuous operation. 24-hour full-load test verifies compressor capacity, discharge temperature and oil separation performance. Suction and discharge pressure data shall be recorded continuously during commissioning. Stable pressure fluctuation within ±0.015 MPa is regarded as qualified. Commissioning oil sampling test is required after 24-hour test run. Oil acid value and particle count verify oil cleanliness after initial equipment running-in period. Commissioning vibration measurement is finished under stable full load. Vibration displacement must stay below 0.12 mm on compressor base after commissioning. Commissioning noise measurement needs stable working state. Measure noise at 1 meter distance with 1.2m height after running 2 hours continuously. Refrigerant charge adjustment is finished during commissioning. Overcharging by 20% will increase liquid floodback risk and reduce system safe operating window. Commissioning safety function test verifies alarm and shutdown. High pressure, low oil pressure and over-temperature protection must trigger action as designed. Commissioning safety valve inspection checks installation state. Confirm exhaust pipe direction and no blockage before system pressure rise during commissioning. Commissioning pipeline inspection checks weld and support. All welding joints and pipe clamps are inspected for loose connection and visible leakage risk. Commissioning leak detection adopts helium test. Helium leak test finds micro leakage below 1×10⁻⁹ Pa·m³/s that bubble test cannot detect. Commissioning for two-stage low temperature compressor starts low stage first. Low stage stabilizes inter-stage pressure before starting high stage compressor. Commissioning VFD parameter calibration is completed on site. Adjust VFD response time and protection threshold to match actual cold storage heat load characteristics. Commissioning log records all test data. Complete commissioning report is the basis of equipment acceptance and later maintenance reference. Commissioning motor insulation test must be done before startup. Insulation resistance below 1 MΩ must be handled before power-on trial run. Commissioning foundation bolt retightening is required after test run. Bolt loosening after thermal expansion will increase vibration displacement of compressor. Commissioning anti-surge protection test applies to centrifugal refrigeration compressor. Verify surge protection activates when flow drops below 28% rated flow. Commissioning heat exchanger fouling baseline data is recorded. Initial temperature difference data is saved as benchmark for later fouling trend monitoring. Commissioning oil separator performance test checks oil carry rate. Oil carry rate below 3 ppm under full load meets factory acceptance requirement. Commissioning ambient temperature shall be recorded. Acceptance test result should be corrected according to ambient temperature during commissioning. Commissioning crankcase heater function test is needed. Verify heater can maintain oil temperature above 10℃ after compressor shutdown state. Commissioning suction filter inspection removes construction debris. 100-mesh suction filter captures metal particles generated during pipeline welding work. Commissioning phase protection function test is required. Phase loss protection must cut power within 10 seconds once abnormal phase condition is simulated. Commissioning remote monitoring system connects and tests. Upload pressure, temperature and vibration data to Xiteliduo Refrigeration Compressors IoT platform. Commissioning acoustic enclosure seal inspection checks gaps. Gap caused by poor seal reduces noise reduction performance of sound insulation enclosure. Commissioning refrigerant recovery test is optional for acceptance. It verifies refrigerant recovery system can safely recycle refrigerant during maintenance work. Commissioning acceptance document includes all test curves. Without complete acceptance records, equipment warranty may be partially affected by manufacturer.

FAQ

1. What vacuum level required in refrigeration compressor commissioning? Pump the system vacuum below 500 Pa before refrigerant charging.
2. How long to run before oil level inspection after startup? Check oil level after 4 hours continuous running of refrigeration compressor.
3. What is the duration of full load commissioning test? 24-hour full-load continuous test is required for new unit acceptance.
4. What vibration limit for compressor base in commissioning? Vibration displacement must be controlled below 0.12 mm after commissioning.
5. What oil carry rate acceptance standard for oil separator? Oil carry rate below 3 ppm under full load meets acceptance requirement.
6. What leak detection method is used for commissioning? Helium leak test is used to detect micro leakage on refrigeration circuit.
7. What startup sequence for two-stage compressor commissioning? Start low stage first and stabilize inter-stage pressure before high stage startup.
8. What protection test must be done during commissioning? Simulate high pressure, low oil pressure and over-temperature protection test.