This useful water flow through pipe calculator is a powerful tool designed to determine the volumetric flow rate of water through a pipe, based pipe diameter, fluid velocity, and pressure.
Consider a situation where a water treatment plant needs to supply 1000 homes – the calculator would help determine if a 12-inch main distribution pipe can handle the required flow rate of approximately 2000 gallons per minute.
Water Flow Through Pipe Calculator
| Pipe Diameter | Flow Velocity (m/s) | Pressure (PSI) | Flow Rate (L/min) |
|---|---|---|---|
| 1 inch | 2.0 | 40 | 57 |
| 2 inch | 2.5 | 40 | 113 |
| 40mm | 2.2 | 40 | 85 |
| 48 inch | 3.0 | 60 | 189,271 |
| 3 inch | 3.0 | 40 | 227 |
| 4 inch | 3.5 | 50 | 400 |
| 6 inch | 4.0 | 60 | 900 |
| 8 inch | 4.5 | 70 | 1600 |
| 10 inch | 5.0 | 80 | 2500 |
| 12 inch | 5.5 | 90 | 3600 |
| 14 inch | 6.0 | 100 | 4900 |
| 16 inch | 6.5 | 110 | 6400 |
Pipe Diameter Flow Rate Chart
| Pipe Diameter | Flow Velocity (m/s) | Flow Rate (L/min) |
|---|---|---|
| 10 mm | 1.0 | 0.79 |
| 15 mm | 1.0 | 1.76 |
| 20 mm | 1.0 | 3.14 |
| 25 mm | 1.0 | 4.90 |
| 32 mm | 1.0 | 8.04 |
| 40 mm | 1.0 | 12.57 |
| 50 mm | 1.0 | 19.63 |
| 63 mm | 1.0 | 30.67 |
| 75 mm | 1.0 | 44.18 |
| 100 mm | 1.0 | 78.54 |
| 150 mm | 1.0 | 176.71 |
| 200 mm | 1.0 | 314.16 |
Water Flow Through Pipe Formula
The volumetric flow rate can be expressed as:
Q = A × vTo find the cross-sectional area A of a circular pipe, you can use:
A = (π × d²) / 4Where d is the diameter of the pipe.
For a 2-inch diameter pipe (approximately 0.167 feet), the area would be calculated as follows:
- Convert diameter to feet: d = 2 in / 12 = 0.167 ft
- Calculate area: A = (π × (0.167)²) / 4 ≈ 0.0218 ft²
- If water flows at a velocity of 5 feet per second: Q = 0.0218 ft² × 5 ft/s = 0.109 ft³/s
How to Calculate the Flow of Water in a Pipe?
- Step 1: Convert pipe diameter to radius r = diameter / 2 and ensure units are in meters.
- Step 2: Calculate the cross-sectional area of the pipe A = π * r².
- Step 3: Compute the volumetric flow rate Q = A * v.
- Step 4: Calculate the total volume of water that flows over the entire length of the pipe V = Q * L.
If you have a 3-inch diameter pipe with a water velocity of 6 feet per second:
Convert to feet: d = 3/12 = 0.25 ft
Calculate area: A = (π × (0.25)²) / 4 ≈ 0.0491 ft²
Calculate flow rate: Q = 0.0491 ft² × 6 ft/s = 0.295 ft³/s
How Much Water Can Flow Through a 2 Inch Pipe in Litres?
- Calculate area for a 2-inch pipe: A = (π × (0.167)²) / 4 ≈ 0.0218 ft²
- Calculate flow rate: Q = A × v = 0.0218 ft² × 5 ft/s = 0.109 ft³/s
- Convert cubic feet to liters (1 cubic foot ≈ 28.3168 liters): Q_liters = 0.109 ft³/s × 28.3168 ≈ 3.09 L/s
Approximately 3.09 liters per second can flow through a standard 2-inch pipe at that velocity.
How Much Water Can Flow Through a 40mm Pipe?
A 40mm pipe has an internal diameter of approximately 1.57 inches.
Assuming a velocity of 4 meters per second:
Convert diameter to meters: d = 40/1000 = 0.04 m
Calculate area: A = (π × (0.04)²) / 4 ≈ 0.00125664 m²
Calculate flow rate in cubic meters per second: Q = A × v ≈ 0.00125664 m² × 4 m/s ≈ 0.00502656 m³/s
Convert to liters (1 m³ = 1000 L): Q_liters ≈ 5.03 L/s
About 5 liters per second can flow through a 40mm pipe at that speed.
How Much Water Can Flow Through a 1 Inch Pipe Per Minute?
Assuming a velocity of 6 feet per second:
- Convert diameter to feet: d = 1/12 ≈ 0.0833 ft
- Calculate area: A ≈ (π × (0.0833)²) / 4 ≈ 0.00544 ft²
- Calculate flow rate: Q ≈ A × v ≈ 0.00544 × 6 ≈ 0.03264 ft³/s
- Convert cubic feet to gallons:
- First convert cubic feet to gallons: Q_gallons/sec ≈ 0.03264 × 7.48 ≈ 0.243 gallons/sec
- Then convert to minutes: Q_gallons/minute ≈ 0.243 × 60 ≈14.58 GPM
Approximately 14.58 gallons per minute can flow through a 1-inch pipe at that speed.
How Much Water Can Flow Through a 48 Inch Pipe?
Assuming an average velocity of 10 feet per second:
Convert diameter to feet: d =48/12=4 ft
Calculate area: A ≈ (π × (4)²) / 4 ≈12 π ≈37 ft²
Calculate flow rate: Q ≈ A × v ≈37 ×10=370 ft³/s
Convert cubic feet to gallons:
- First convert cubic feet to gallons: Q_gallons/sec=370×7≈2779 gallons/sec
- Then convert to minutes: Q_gallons/minute=2779×60≈166740 GPM
Approximately 166,740 gallons per minute can flow through a 48-inch pipe at that speed.
