Completion Acceptance Standards for Cold Storage Projects | Pressure Test, Vacuum Extraction, Machine Test, Parameter Record, Delivery Acceptance Checklist
The completion acceptance of the cold storage is the final stage of installation and commissioning. It is not enough to only check whether it can cool down, but also to verify all indicators of pressure, vacuum, protection, defrosting, oil return, and alarm item by item.
The acceptance is divided into five stages: nitrogen pressure and leak detection acceptance, vacuum suction acceptance, refrigerant filling acceptance, no-load testing, and continuous operation acceptance with load.
The acceptance form for the Xiteluo supporting unit includes: vacuum degree, pressure drop, refrigerant filling weight, high and low pressure settings, oil pressure difference, exhaust temperature, superheat, oil level, and defrosting parameters.
Nitrogen pressure maintenance acceptance: maintain a pressure of 1.8-2.0MPa for 24 hours, and the pressure drop after temperature correction is qualified; Vacuum secondary precision pumping, below 100Pa, holding pressure for 2 hours, with a rebound of no more than 150Pa.
Load acceptance requires continuous operation for no less than 24 hours, stable storage temperature at the set value, normal logic for compressor start stop, loading and unloading, and defrosting, and no abnormal alarms.
The key inspection and protection functions for acceptance include high pressure, low pressure, oil pressure difference, phase sequence, exhaust high temperature, and crankcase heating. Each item is simulated and tested to confirm that the protection is reliable and not ineffective.
Many projects simplify acceptance, deliver directly after cooling is qualified, and do not test for protection. In the later stage, if there is a malfunction, the protection will fail and the compressor will be damaged directly. There are many after-sales disputes.
Additional verification for parallel unit acceptance: head rotation logic, return oil balance, oil level balance of each head, and automatic switching function after a single head failure.
The acceptance of foreign trade projects requires bilingual acceptance records, parameter photography and archiving, and delivery to customer maintenance personnel for subsequent parameter calibration and troubleshooting.
The acceptance materials include: nameplate parameters, protection settings, refrigerant filling amount, refrigeration oil model, pipeline drawings, spare parts list, alarm code manual, which shall be handed over to Party A.
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FAQ
1. What is the acceptance pressure for cold storage pressure? Maintain a nitrogen pressure of 1.8-2.0MPa for 24 hours.
2. What are the acceptance criteria for vacuum pumping? Secondary precision extraction below 100Pa, with pressure recovery not exceeding 150Pa.
How long is the continuous test run with load? Stable operation for no less than 24 hours.
4. Should various protections be simulated and tested during acceptance? Protection functions must be tested item by item.
What are the additional key points for the acceptance of parallel units? Rotating start stop, oil return balance, and fault switching.
What are the acceptance and delivery materials included? Drawings, parameters, spare parts list, alarm manual.
7. Just check if the warehouse temperature can complete the acceptance? No, protection, vacuum, and leak detection all need to be verified.
