Comparison Between Piston & Scroll Compressor

S.No Description Piston Compressor Scroll Compressor
1 Energy Saving There are many losses in piston compressor such as valve blade losses, friction losses, etc. These factors cause the specific power to be high compared to other compressor types There efficiency is much higher as there are no intermittent opening and closing of valves. Friction is negligible as the scrolls do not touch each other increasing the specific power
2 Reliability There are a lot of moving parts in the piston compressor like piston, rings, crank shaG, valve blades, etc. Higher chances of mechanical failure. Compared to piston compressor it 70% lesser moving parts making it more reliable
3 Wear Piston compressors have a lot of hidden maintenance over it lifecycle like changing piston rings, pistons, cylinders, Valve Blades, Non Return Valve, etc. There is no physical contact between the scrolls therefore wear is negligible. Tip seals are also avoided in BAC Scroll compressors.
4 Transmission Loss Most Piston compressors are belt driven causing a minimum slippage loss of 5% and also frequent belt replacements. Direct Drive has no slippage losses
5 Noise Piston compressors usually operate at >80 dB Scroll compressor operates at <70dB
6 Pulsating Air Delivery Due to piston movements the air delivery is pulsating Air delivery is continuous
7 Starting Power The starting power is very high as the compressor has to overcome multiple friction losses The starting power is very low compared to piston compressors as there are no contact surfaces
8 Maintenance Overall maintenance cost is high since there is a drop in efficiency due to ring wear,leaking valve blades, cylinder changes, piston changes, connecting rod bearing changes, etc. The scroll compressor does not drop efficiency overtime. The maintenance required will be periodic oil and filters.
9 Duty Cycle The Ideal duty cycle of piston compressors is less that 70%. Continuous running will lead faster depletion of performance. Scroll compressor has forced cooling with the aluminium cooler, maintaining the temperature and making it run at >70% duty cycle

Maintenance Schedules
Typical Piston Compressor Maintenance Schedule from Leading Brand

Maintenance Schedule – TS05 LD
S.No Parts Every 500 hr or 1 Month Every 1000 hr or 3 Month Every 2500 hr or 1 Year Every 5000 hr or 2 Years Every 7500 hr or 3 Years
1 Oil Replace        
2 Air Filter    Replace      
3 Breather Valve    Replace      
4 Non return valve (NRV)Kit    Replace      
5 Tune Up Kit     Replace    
6 Safety valves        Replace  
7 Compressor package         Over haul
Maintenance Schedule of BAC Scroll Compressor
S.No Parts Every 500 hr or 1 Month Every 1000 hr or 3 Month Every 2500 hr or 1 Year Every 4000 hr or 1 Years
1 Oil       Replace
2 Air Filter  Clean     Replace
3 Air Oil Separator       Replace
4 Oil Filter   Replace
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