What is the difference between rotary screw and piston compressors for blasting?

Rotary screw compressors provide continuous oil-free air flow at lower noise levels (68-72 dB), suitable for multi-hour continuous duty. Piston compressors are lower cost but generate higher noise (85-95 dB) and require more maintenance. For industrial blasting requiring 4+ hours/day, screw compressors (APEX-30/45/75) are strongly preferred. Piston units are acceptable for occasional use under 2 hours/day.

What maintenance does an industrial screw compressor require?

Daily: check oil level, drain condensate from receiver. Weekly: inspect filters, check belt tension (if applicable). Monthly: replace air filter element, check safety valves, verify pressure settings. Every 2,000 hours: change oil and filters, inspect air-end. Every 10,000 hours: full air-end inspection, bearing replacement. BLAST APEX APEX series uses genuine replacement parts and includes service documentation with every unit.

Can the APEX-75 run 24/7?

Yes. The APEX-75 is rated for continuous duty (100% duty cycle) with its heavy-duty cooling architecture. The key requirement for 24/7 operation is adequate ventilation — the compressor room needs minimum 3 air changes per minute. For outdoor operation in ambient temperatures above 40°C, supplemental cooling or a larger unit may be required to maintain rated FAD.

Industrial Air Solutions

Industrial
Compressors

BLAST APEX manufactures high-efficiency rotary screw compressors engineered specifically for the rigorous duty cycles of the abrasive blasting industry. Our compressor family provides a reliable, consistent airflow required for high-pressure industrial surface preparation and coating systems.

APEX-30 Compressor

Efficiency-optimized 30HP screw compressor for medium-scale blasting and industrial plant air.

Power: 30 HP / 22 kW | Airflow: 120 CFM

Ideal Use Case:

Fabrication shops & 150L Blasting Pots.

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APEX-45 Compressor

Our flagship high-performance 60HP industrial screw compressor for continuous 24/7 blasting operations.

Power: 60 HP / 45 kW | Airflow: 248 CFM

Ideal Use Case:

Shipyard hulls & 300L/500L Blasting Pots.

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APEX-75 Compressor

High-volume 100HP screw compressor for massive industrial coating lines and shipyard maintenance.

Power: 100 HP / 75 kW | Airflow: 450 CFM

Ideal Use Case:

Bulk Blasting & 2 x 500L Pot Setups.

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Compressor Sizing Guide

Model	Power	FAD	Pressure	Best Blasting Application
APEX-30	30 kW	300 CFM	7-10 bar	100-200L blasting pots, 1-2 operators
APEX-45	45 kW	450 CFM	7-10 bar	200-300L pots, 2-3 operators, single blast room
APEX-75	75 kW	750 CFM	7-10 bar	500-600L pots, 4+ operators, walk-in blast rooms, 24/7

Frequently Asked Questions

What is the minimum CFM for a #6 blast nozzle?

A #6 nozzle (9.5mm bore) requires 180-210 CFM at 7 bar. The minimum reliable: 150 CFM — below this, blast quality drops sharply. The APEX-45 (450 CFM) is ideal for a single #6 nozzle with margin for extra operators or hose length. Rule: each mm of nozzle bore requires approximately 30-35 CFM. #8 (12.7mm): 300-400 CFM. #4 (6.4mm): 100-120 CFM.

Rotary screw or piston — which is better for sandblasting?

Rotary screw: 100% duty cycle, stable CFM output, oil-free air (with separator), 68-72 dB(A) noise. Piston: 50-70% duty cycle, CFM fluctuates, oil carryover risk, 85-95 dB(A) noise. For professional blasting (4+ hours/day): always rotary screw. For occasional use (<2 hours/day): piston is acceptable at lower budget. BLAST APEX APEX series are all rotary screw — rated for 24/7 industrial operation.

How do I calculate compressor energy costs?

Energy cost = (kW × hours × electricity rate × days per year). Example: APEX-45 (45 kW) running 8 hrs/day, 300 days/year at ₹8/kWh: 45 × 8 × 300 × 8 = ₹8,64,000/year in electricity. Energy is the largest operating cost — optimize by: sizing correctly (oversized = wasted energy), maintaining air filters (dirty filter increases power by 5-10%), and eliminating air leaks in distribution system.

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