1. What is a Flow Rate Calculator Using Pressure?

Definition: This calculator estimates the flow rate through a valve or orifice based on the flow coefficient, pressure drop, and fluid specific gravity.

Purpose: It helps engineers and technicians determine fluid flow rates in piping systems for proper system design and analysis.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Flow \) — Flow rate (gallons per minute)
• \( C_v \) — Flow coefficient (dimensionless)
• \( \Delta P \) — Pressure drop across the valve (psi)
• \( SG \) — Specific gravity of the fluid (relative to water)

Explanation: The flow rate is proportional to the flow coefficient and the square root of the pressure drop divided by specific gravity.

3. Importance of Flow Rate Calculation

Details: Accurate flow rate estimation ensures proper system performance, valve sizing, and process control in fluid systems.

4. Using the Calculator

Tips: Enter the flow coefficient (C_v), pressure drop in psi, and specific gravity (default 1.0 for water). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the flow coefficient (C_v)?
A: C_v is a valve's capacity to pass fluid, defined as the flow of water in gpm at 60°F that will produce a 1 psi pressure drop.

Q2: Where can I find the C_v value?
A: C_v is typically provided in valve manufacturer specifications or technical datasheets.

Q3: What's a typical specific gravity for common fluids?
A: Water = 1.0, Gasoline ≈ 0.72, Diesel ≈ 0.82, SAE 30 Oil ≈ 0.89.

Q4: Does this formula work for gases?
A: This simplified version is primarily for liquids. Gas flow calculations require additional factors.

Q5: What if my pressure drop is very small?
A: The formula becomes less accurate at very low pressure drops (typically below 5 psi).