Question 1

What is SCFH?

Accepted Answer

Standard Cubic Feet per Hour—gas flow at standard conditions. 1 SCFH = 0.4719 LPM = 0.0167 SCFM.

Question 2

When to use SCFH vs SCFM?

Accepted Answer

SCFH for slower flows like gas appliances, SCFM for faster industrial air flows. SCFM = SCFH × 60.

Question 3

How does pipe diameter affect flow rate?

Accepted Answer

Flow rate is proportional to the square of diameter. Doubling pipe diameter quadruples potential flow rate at the same pressure.

Question 4

What's the difference between volume and mass flow rate?

Accepted Answer

Volume flow (gallons/min) ignores fluid density. Mass flow (kg/s) accounts for density, important when density changes with temperature or pressure.

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