Cylinder ke liye compressor ki size kaise decide karein?

Cylinder ki air consumption (NL/min ya CFM) calculate karo, phir 20-30% margin add karo leakage aur peak demand ke liye. 63 mm × 200 mm cylinder 30 cyc/min pe 6 bar pressure pe approximately 9 CFM consume karta hai — toh 12 CFM compressor select karna chahiye (roughly 3 HP).

Does stroke length affect air consumption?

Yes — proportionally. Doubling the stroke doubles the air per cycle. A 63 mm × 400 mm cylinder uses 2× the air of a 63 mm × 200 mm cylinder at the same bore and cycles. This is why short-stroke cylinders are always more air-efficient for the same number of cycles.

Does pressure affect air consumption linearly?

Yes, approximately. Going from 6 bar to 8 bar increases air consumption by (9.013/7.013) = 28%. Lower pressure saves air BUT also reduces force (force ∝ pressure). For most applications, running at the minimum pressure that delivers required force is the most efficient.

Compressor already installed — can I add more cylinders?

Check existing compressor delivery (CFM at working pressure) minus current total consumption = spare capacity. If the new cylinder needs less than the spare, you can add it. If it exceeds, you need a larger compressor or an additional smaller one in parallel.

Where can I buy SPAC cylinders and compressors in Noida?

Shri Narayan Machinery LLP at C-101, Sector 9, Noida is an authorized SPAC Pneumatic dealer. We stock ESNC (ISO 15552) and SDNU (ISO 6432) series cylinders + help with compressor sizing. Call +91-9811104037.

Free Calculator English + हिंदी

Pneumatic Cylinder Air Consumption Calculator

Size your compressor and dryer from cylinder duty cycle

Cylinder ke duty cycle se compressor size decide karein

Quick Overview

Sizing a compressor for pneumatic cylinders requires calculating the free air (normal atmospheric) volume each cylinder consumes per minute. For a double-acting cylinder, air is consumed on both extend and retract strokes: V_per_cycle = 2 × (π/4 × D² × L) × (P + 1.013) / 1.013, where D is bore in metres, L is stroke in metres, P is gauge pressure in bar, and the ratio converts actual cylinder volume to equivalent free (normal) air volume. A 63 mm bore × 200 mm stroke cylinder running at 30 cycles/minute at 6 bar consumes: 2 × 0.000623 × (7.013/1.013) × 30 = 259 NL/min = 9.1 CFM. Add 20–30% margin for leakage, and you'd want a compressor delivering at least 12 CFM at 7+ bar working pressure to drive this one cylinder reliably. For multiple cylinders, sum their requirements — diversified loads usually allow a 10–20% reduction based on simultaneity. This calculator handles single and double-acting cylinders and returns the sizing output in both L/min and CFM.

Calculator

Bore(बोर)

Stroke(स्ट्रोक)

Cycles/min(Cycles)

/min

Pressure(प्रेशर)

bar

Cylinder type(सिलेंडर प्रकार)

Consumption

259.0NL/min

Same in CFM

9.15CFM

Compressor size (+25%)

11.4CFM

Per cycle: 8.632 NL of free air. Formula: V_cycle = 2 × (π/4) × (63/1000)² × (200/1000) × (6+1.013)/1.013 = 8.632 NL. Add 20-30% margin for leakage and transient demand before finalising compressor size.

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ƒFormula

V_cycle (NL) = n × (π/4) × D² × L × (P + 1.013) / 1.013 | Flow (NL/min) = V_cycle × cycles/min

n = 1 for single-acting, 2 for double-acting (both strokes use air). D = bore in mm / 1000 (metres). L = stroke in mm / 1000 (metres). P = gauge pressure (bar). Result is normalised (NL — normal litres at 1 atm). Divide by 28.317 to convert to CFM. Always add 20–30% safety margin for leakage and transient demand.

Units: Flow: normal litres/minute (NL/min) or CFM · Dimensions: mm · Pressure: bar gauge

Cylinder kitna air consume karta hai? Compressor kaise size karein?

Compressor select karte waqt pata hona chahiye ki cylinder kitna free air per minute consume karega. Double-acting cylinder extend aur retract dono strokes pe air use karta hai. Formula: V_per_cycle = 2 × (π/4 × D² × L) × (P+1.013)/1.013. Yahan D bore in metres, L stroke in metres, P gauge pressure in bar. 63 mm bore × 200 mm stroke cylinder 30 cycles/min pe 6 bar pressure pe 259 NL/min (9.1 CFM) air consume karta hai. 20-30% margin add karke compressor select karna chahiye. Single cylinder ke liye small compressor, multiple cylinders ke liye sum + safety margin.

उदाहरण / Example: Example: Factory mein 3 x 80 mm bore cylinders, 300 mm stroke, 20 cycles/min, 6 bar pressure. Per cylinder air ≈ 560 NL/min = 19.8 CFM. Total = 60 CFM. 20% margin → 72 CFM compressor size. Ye 15 HP screw compressor ka level hai.

Worked Examples

Sizing a compressor for one SPAC cylinder

Problem: SPAC ESNC 63 mm bore × 200 mm stroke × 30 cycles/min at 6 bar, double-acting.

Solution: V_cycle = 2 × (π/4) × 0.063² × 0.2 × (7.013/1.013) = 2 × 0.000623 × 6.92 = 8.62 NL per cycle. At 30 cycles/min: 259 NL/min = 9.14 CFM. With 25% margin: 12 CFM compressor required. A 3 HP Atlas Copco or ELGi compressor delivers ~12 CFM at 7 bar — suitable.

Multiple cylinders on one compressor

Problem: A fabrication station has 5 SPAC SDNU 25 mm × 100 mm mini cylinders at 20 cycles/min each, 6 bar double-acting.

Solution: V_cycle per mini = 2 × (π/4) × 0.025² × 0.1 × 6.92 = 0.0068 NL. At 20 cyc/min × 5 cylinders = 0.68 NL/min × 5 = 3.4 NL/min total = 0.12 CFM. These tiny cylinders barely register — even a small 1 HP compressor (4 CFM) is vast overkill.

Single-acting vs double-acting difference

Problem: Same cylinder, does single-acting cut air consumption in half?

Solution: For the example above (63×200, 30 cyc/min, 6 bar): double-acting = 259 NL/min. Single-acting = 129 NL/min — exactly half (air used only on extend; retract is spring return). Single-acting is lighter air consumption but max force is 15–25% lower due to spring counter-pressure.

Air Consumption — SPAC Standard Bores × Common Strokes at 6 bar (double-acting)

Bore (mm)	Stroke (mm)	NL per cycle	NL/min @ 30 cyc	CFM @ 30 cyc
25 (SDNU)	50	0.034	1.0	0.04
32 (ESNC)	100	0.111	3.3	0.12
40 (ESNC)	100	0.174	5.2	0.18
50 (ESNC)	200	0.544	16.3	0.58
63 (ESNC)	100	0.432	12.9	0.46
63 (ESNC)	200	0.863	25.9	0.92
63 (ESNC)	400	1.726	51.8	1.83
80 (ESNC)	200	1.391	41.7	1.47
80 (ESNC)	400	2.782	83.5	2.95
100 (ESNC)	400	4.348	130.4	4.61
125 (ESNC)	500	8.492	254.8	9.00
160 (ESNC)	500	13.91	417	14.73

Values in NL (normal litres) at 1 atm / 20°C. Scale linearly with cycles/min. For pressures other than 6 bar, multiply by (P_bar + 1.013) / 7.013. Add 20-30% margin when sizing compressor.

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Frequently Asked Questions — Pneumatic Cylinder Air Consumption Calculator

For a double-acting cylinder: V_cycle (NL) = 2 × (π/4) × bore² × stroke × (P + 1.013) / 1.013, with bore + stroke in metres and P in bar. Multiply by cycles per minute to get NL/min. Divide NL/min by 28.317 to get CFM.

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