We've been getting calls from plant managers lately—ambient temps barely above 25°C, yet compressors are already tripping on high-temperature alarms. The common question: "Why is it failing before summer even starts?"
Early-season overheating often points to hidden buildup, not just cooling capacity. Here's a quick troubleshooting checklist:
1. Pinpoint the Heat Source
When an alarm hits, don't shut down immediately. Wearing heat-resistant gloves, carefully feel two lines:
Discharge pipe (compressor outlet): If scorching hot, discharge temp is indeed high.
Oil return line (before compressor): If also very hot, the issue is internal heat generation, not cooling.
The cooler is just the window; the compressor head is the fireplace. If the fire burns too hot, no window fixes it.
2. Replace Oil Filter and Separator First
This is the most overlooked fix. A clogged oil filter reduces flow, so heat can't be carried away. A separator with high differential pressure also cuts cooling efficiency. Both can degrade well before their scheduled replacement interval.
Quick tip: If the cooler looks clean and ambient temp is normal but high temps persist, swap out the oil filter and separator. Low cost, often the quickest win.
3. Deep-Clean the Cooler
Blowing compressed air works in dry seasons. But with spring humidity, dust turns to mud and cakes deep in the fins. Air only compacts it further.
Better approach: Remove the cooler and wash with low-pressure water along the fin direction, then dry. Or use a dedicated cleaner—spray on, wait 15 minutes, rinse. This restores 80%+ of cooling capacity.
4. If Nothing Works, Check the Compressor Head
If filters and cooler are fine but temp stays high, suspect bearing wear and increased rotor clearances. This creates "internal leakage"—hot air recirculates inside the head, generating more heat.
Signs: Discharge end abnormally hot, noticeable temperature gap between front and back of the housing. This needs professional repair—schedule it before peak summer to avoid breakdowns when you need the machine most.
Bottom Line
Different root causes need different fixes. Before the real heat arrives, run through this checklist: change filters, deep-clean the cooler, inspect the head if needed. Come July, a machine that runs reliably while others scramble for repairs is worth every minute spent now.
If you get stuck during inspection, send us photos or data. Years of field experience might save you a few wrong turns.
2.Screw vs. Centrifugal Compressors: Which One Makes More Sense for High-Flow Applications?
The choice isn't about which machine is cheaper—it's about how stable your air demand is.
1. Stable Load → Go Centrifugal
If you run full-load continuously with fluctuations under 20%, centrifugal is the better deal.
Lower energy cost: 8%–15% more efficient than screw at full load
High capacity: easily handles 100 m³/min or more per unit
Oil-free: simpler downstream treatment
Downsides: sensitive to low load—can surge and trip below 70% flow; maintenance typically requires factory service.
2. Fluctuating Demand → Go Screw
If your air usage varies throughout the day or between shifts, screw compressors are more forgiving.
Flexible modulation: VFD models run stably from 20% to 100%
No surge risk
Local maintenance: most issues can be handled on-site
Downsides: efficiency drops below 60% load, increasing power costs; large-flow units have higher upfront cost.
3. Common Hybrid Approach
Centrifugal for base load + VFD screw for peak trimming gives you both efficiency and stability. Higher initial investment, but pays off in long-term savings and reliability.
Quick Summary
Caption | Condition | Recommendation |
| Full-load > 6,000 hrs/year, stable demand | Centrifugal |
| Wide load swings, frequent shift changes | VFD screw |
| Budget allows, want the best system | Centrifugal base + screw trimming |
Pull up your 24-hour air demand curve—the right choice will become clear.
3.Stop Looking Only at the Purchase Price? These 3 "Hidden Costs" Are Where Your Money Really Goes
Buying cheap ≠ saving money. The real costs are these three:
1. Oil Contamination Cleanup
Oil in the air ruins products and clogs precision filters – replacing filters in one year can cost half the price of a new unit.
2. Energy Waste – A Slow Bleed
A $2,000 price difference can turn into a $10,000 electricity bill gap. Inefficient machines burn extra fuel and power every single hour.
3. Downtime Delays
When the compressor stops, your project stops. Workers stay idle, deadlines slip, and penalties pile up. The machine isn't expensive – it's expensive when it's not running.
The Fix?
Calculate total cost of ownership: Purchase Price + Energy + Maintenance + Downtime = True Cost.
We make 100% oil-free diesel screw air compressors. Not the cheapest to buy, but the cheapest to run over three years.
What's your operating condition? Drop a comment and I'll run the numbers for you.
