Pipe Size GPM Calculator by Tons of Concrete

Flow Rate Formula:

\[ Q = \pi \times \left(\frac{d}{2}\right)^2 \times v \times 15850.3 \]

Flow Rate (gpm):

1. What is a Pipe Size GPM Calculator?

Definition: This calculator estimates the flow rate in gallons per minute (gpm) through a pipe based on its diameter and the fluid velocity.

Purpose: It helps engineers, plumbers, and irrigation specialists determine pipe capacity for fluid transport systems.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Q = \pi \times \left(\frac{d}{2}\right)^2 \times v \times 15850.3 \]

Where:

\( Q \) — Flow rate (gallons per minute, gpm)
\( d \) — Pipe diameter (meters, m)
\( v \) — Flow velocity (meters per second, m/s)
\( 15850.3 \) — Conversion factor (gpm per m³/s)

Explanation: The formula calculates the cross-sectional area of the pipe, multiplies by velocity to get volumetric flow, then converts to gpm.

3. Importance of Flow Rate Calculation

Details: Proper flow rate estimation ensures adequate pipe sizing for efficient fluid transport without excessive pressure loss.

4. Using the Calculator

Tips: Enter the pipe diameter in meters and flow velocity in m/s (default 1.0 m/s). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical flow velocity for water pipes?
A: Residential plumbing typically uses 1-2 m/s, while industrial systems may use higher velocities.

Q2: How do I convert pipe diameter from inches to meters?
A: Multiply inches by 0.0254 to get meters (1 inch = 0.0254 meters).

Q3: What affects the conversion factor?
A: The factor combines unit conversions (m³ to gallons and seconds to minutes).

Q4: Can I use this for other liquids besides water?
A: Yes, but viscosity differences may affect actual flow rates at given velocities.

Q5: How does pipe material affect the calculation?
A: Material affects friction loss but not the basic flow rate calculation shown here.