Swagelok Flow Calculator

Swagelok Flow Equation:

\[ Q = C_v \sqrt{\frac{\Delta P}{SG}} \]

Flow Coefficient (C_v):

dimensionless

Pressure Drop (ΔP):

psi

Specific Gravity (SG):

dimensionless

Flow Rate (Q):

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1. What is the Swagelok Flow Equation?

The Swagelok flow equation calculates the flow rate of a fluid through a valve or fitting using the flow coefficient (C_v), pressure drop (ΔP), and specific gravity (SG) of the fluid. It's widely used in fluid system design and analysis.

2. How Does the Calculator Work?

The calculator uses the Swagelok flow equation:

\[ Q = C_v \sqrt{\frac{\Delta P}{SG}} \]

Where:

\( Q \) — Flow rate (gpm)
\( C_v \) — Flow coefficient (dimensionless)
\( \Delta P \) — Pressure drop across the valve/fitting (psi)
\( SG \) — Specific gravity of the fluid (dimensionless)

Explanation: The equation shows that flow rate is proportional to the flow coefficient and the square root of the pressure drop to specific gravity ratio.

3. Importance of Flow Rate Calculation

Details: Accurate flow rate calculation is essential for proper sizing of valves and fittings, ensuring system efficiency and preventing issues like cavitation or excessive pressure drops.

4. Using the Calculator

Tips: Enter the flow coefficient (typically provided by manufacturer), pressure drop across the component, and fluid specific gravity (1.0 for water at 60°F). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical C_v value range?
A: C_v values vary widely depending on valve type and size, from less than 1 for small valves to over 1000 for large valves.

Q2: How does specific gravity affect the flow rate?
A: Higher specific gravity (denser fluids) results in lower flow rates for the same pressure drop, as shown by the inverse square root relationship.

Q3: Is this equation valid for all fluids?
A: The equation works well for Newtonian, single-phase liquids. For gases or multiphase flows, different equations are needed.

Q4: What are common applications of this calculation?
A: Used in designing and analyzing fluid systems in industries like chemical processing, oil & gas, power generation, and water treatment.

Q5: How accurate is this calculation?
A: Accuracy depends on correct C_v values and proper application. For critical systems, always consult manufacturer data and consider real-world testing.