A surprising finding is the inconsistency of refrigerant, oil and vibration testing in chillers and refrigeration systems. The inconsistencies include the frequency or infrequency of sampling to how samples are taken and who handles the samples to the lack of follow-through. Therefore, follow these tips on sampling and testing:
• Oil and refrigerant samples should be taken simultaneously at a minimum of once a year: However, a testing program should correlate to the chiller's workload, performance, age, and size. This may require more frequent sampling and testing.
• Samples should be taken shortly after a chiller or refrigerant system is taken offline (not operating). This will ensure that a more accurate reading is achieved because the evaporator refrigerant can easily be influenced by the flow of condenser refrigerant.
• Oil testing alone tells only a part of the story. While oil analysis provides important information about the condition of the lubricant within the machinery, it doesn't reveal anything about the particles that may be indicative of imminent component failure. Wear particle analysis is necessary to identify the suspended particles in lubricated components and identify abnormal wear-related conditions at an early stage.
• Oil and refrigerants are classified as hazardous materials and require U.S. EPA and U.S. DOT certification and training to handle and ship cylinders.
• Early detection is key to preventing costly premature services, repairs and equipment/parts replacements. All oil and refrigerant testing programs should provide an interpretation of findings and, if necessary, recommendations for remedial actions. If contaminants are detected, it may be necessary to benchmark and track/trend changes in these contaminants' levels over a period of time.
Source: Hudson Technologies
|
