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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