1. What is SCFM Calculation for Pneumatic Cylinders?

Definition: This calculator determines the Standard Cubic Feet per Minute (SCFM) of air flow required for a pneumatic cylinder to operate at specified parameters.

Purpose: It helps engineers and technicians properly size pneumatic systems and select appropriate compressors.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{SCFM} \) — Standard cubic feet per minute of air flow
• \( A \) — Piston area (square inches)
• \( S \) — Stroke length (inches)
• \( P \) — Operating pressure (psi)
• \( N \) — Cycles per minute

Explanation: The formula calculates the volume of compressed air needed at standard conditions (14.7 psi at sea level) to operate the cylinder at the specified rate.

3. Importance of SCFM Calculation

Details: Proper SCFM calculation ensures your air compressor can deliver sufficient airflow for consistent pneumatic cylinder operation without pressure drops.

4. Using the Calculator

Tips: Enter the piston area, stroke length, operating pressure, and cycles per minute. All values must be > 0 (except pressure which can be 0).

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between CFM and SCFM?
A: CFM is actual flow rate, while SCFM is standardized to 14.7 psi at sea level, allowing comparison between different systems.

Q2: How do I find the piston area?
A: For circular pistons, use \( \pi \times r^2 \) where r is the piston radius in inches.

Q3: Why is atmospheric pressure (14.7 psi) in the formula?
A: It converts gauge pressure (P) to absolute pressure for accurate volume calculations.

Q4: What if my cylinder is double-acting?
A: Double the calculated SCFM as air is used on both extension and retraction.

Q5: How does elevation affect SCFM requirements?
A: At higher elevations, the 14.7 factor should be adjusted for local atmospheric pressure.