Flow Rate To Pressure Calculator

Pressure Drop Equation:

\[ \Delta P = \left( \frac{Q}{C} \right)^2 \times SG \]

Pressure Drop (ΔP):

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1. What is the Flow Rate to Pressure Equation?

The flow rate to pressure equation calculates the pressure drop (ΔP) across valves and fittings based on flow rate (Q), flow coefficient (C), and specific gravity (SG). This is essential for hydraulic system design and analysis.

2. How Does the Calculator Work?

The calculator uses the pressure drop equation:

\[ \Delta P = \left( \frac{Q}{C} \right)^2 \times SG \]

Where:

\( \Delta P \) — Pressure drop (psi)
\( Q \) — Flow rate (gpm)
\( C \) — Flow coefficient (unitless)
\( SG \) — Specific gravity (unitless)

Explanation: The equation shows that pressure drop increases with the square of flow rate and is directly proportional to specific gravity, while being inversely related to the square of the flow coefficient.

3. Importance of Pressure Drop Calculation

Details: Accurate pressure drop calculation is crucial for proper valve selection, pump sizing, system efficiency optimization, and ensuring adequate flow throughout hydraulic systems.

4. Using the Calculator

Tips: Enter flow rate in gallons per minute (gpm), flow coefficient (typically provided by valve manufacturers), and specific gravity of the fluid. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the flow coefficient (C)?
A: The flow coefficient represents the flow capacity of a valve at a specified pressure drop, typically measured at 1 psi pressure drop.

Q2: How does specific gravity affect pressure drop?
A: Higher specific gravity fluids (denser fluids) will create greater pressure drops at the same flow rate due to increased fluid resistance.

Q3: When is this equation most applicable?
A: This equation is most accurate for turbulent flow conditions in valves and fittings with water-like fluids at standard temperatures.

Q4: What are typical flow coefficient values?
A: Flow coefficients vary by valve size and type, ranging from 1-2 for small valves to hundreds for large industrial valves.

Q5: Can this be used for gases?
A: This specific equation is primarily for liquids. Gas flow calculations require different formulas accounting for compressibility effects.