Calculate Water Flow From Pressure

Water Flow Equation:

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

Water Flow Rate (Q):

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1. What Is The Water Flow From Pressure Equation?

The water flow equation calculates flow rate through a valve or orifice based on pressure difference, flow coefficient, and fluid specific gravity. It's widely used in hydraulic engineering and fluid dynamics to determine flow capacity in various systems.

2. How Does The Calculator Work?

The calculator uses the water flow equation:

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

Where:

\( Q \) — Flow rate (GPM)
\( Cv \) — Flow coefficient (unitless)
\( \Delta P \) — Pressure difference (psi)
\( SG \) — Specific gravity (unitless)

Explanation: The equation shows that flow rate is proportional to the square root of the pressure-to-specific-gravity ratio, scaled by the flow coefficient.

3. Importance Of Water Flow Calculation

Details: Accurate flow calculation is essential for designing piping systems, selecting appropriate valve sizes, ensuring proper system performance, and optimizing energy efficiency in fluid transport systems.

4. Using The Calculator

Tips: Enter flow coefficient (Cv), pressure difference in psi, and specific gravity (1.0 for water). All values must be positive numbers with specific gravity greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is the flow coefficient (Cv)?
A: Cv represents the flow capacity of a valve - the number of US gallons per minute of water that will flow through the valve with a 1 psi pressure drop.

Q2: What is specific gravity (SG)?
A: Specific gravity is the ratio of a fluid's density to the density of water. Water has SG = 1.0, while other fluids have values different from 1.0.

Q3: When is this equation applicable?
A: This equation works well for Newtonian fluids under turbulent flow conditions and is commonly used for water and similar liquids in industrial applications.

Q4: Are there limitations to this equation?
A: The equation assumes turbulent flow and may be less accurate for highly viscous fluids, non-Newtonian fluids, or under laminar flow conditions.

Q5: Can this be used for gases?
A: While similar principles apply, gas flow calculations typically use different equations that account for compressibility effects and different flow regimes.