Pipe Volume Calculator

Pipe Volume is evaluated from Pipe Inner Diameter, Pipe Length and Flow Rate. The calculation reports Volume, Volume and Volume.

Results

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About the Pipe Volume Calculator

Pipe Volume is treated here as a quantitative relation between Pipe Inner Diameter, Pipe Length and Flow Rate and Volume, Volume, Volume and Water Weight.

The calculator uses a multi formula configuration. Each reported value is read as a direct evaluation of the stored rules with the declared field formats and units.

Formula basis:
Volume = pi x r^2 x L
where r = pipe inner diameter / 2 (in feet)
L = pipe length in feet
- Cubic feet x 7.48052 = gallons
- Cubic feet x 28.3168 = liters
- Cubic feet x 62.4 = pounds (of water)
Fill time (minutes) = volume (gallons) / flow rate (gpm)
IMPORTANT: Use the INNER diameter (ID), not the nominal size. Nominal 1-in pipe has ID of ~1.049 in (Schedule 40).

Interpret the outputs in the order shown by the result fields. Optional inputs affect only the outputs that depend on those variables.

Formula & How It Works

The calculation applies the following relations exactly as recorded in the metadata:

Volume = pi x r^2 x L
where r = pipe inner diameter / 2 (in feet)
L = pipe length in feet
- Cubic feet x 7.48052 = gallons
- Cubic feet x 28.3168 = liters
- Cubic feet x 62.4 = pounds (of water)
Fill time (minutes) = volume (gallons) / flow rate (gpm)
IMPORTANT: Use the INNER diameter (ID), not the nominal size. Nominal 1-in pipe has ID of ~1.049 in (Schedule 40).

Each output field is produced by substituting the supplied inputs into the relevant relation and then applying the declared rounding or text format.

Worked Examples

Example 1: Residential water service: 1-in pipe, 50 ft from meter to house

Inputs

pipe_id: 1.049 pipe_len: 50 flow_rate: 5
Volume: 2.245 gal. Volume: 8.5 L. Volume: 0.3001 ft^3. Water Weight: 18.73 lbs. Fill Time: 0.45 min

With Pipe Inner Diameter = 1.049, Pipe Length = 50 and Flow Rate = 5 as the stated inputs, the result is Volume = 2.245 gal, Volume = 8.5 L and Volume = 0.3001 ft^3. Each value corresponds to the declared output fields.

Example 2: Sprinkler main: 2-in PVC, 200 ft irrigation run

Inputs

pipe_id: 2.067 pipe_len: 200 flow_rate: 20
Volume: 34.863 gal. Volume: 131.97 L. Volume: 4.6606 ft^3. Water Weight: 290.82 lbs. Fill Time: 1.74 min

With Pipe Inner Diameter = 2.067, Pipe Length = 200 and Flow Rate = 20 as the stated inputs, the result is Volume = 34.863 gal, Volume = 131.97 L and Volume = 4.6606 ft^3. Each value corresponds to the declared output fields.

Example 3: Radiant heat loop: 1/2-in PEX, 300 ft floor loop

Inputs

pipe_id: 0.475 pipe_len: 300 flow_rate: 0.5
Volume: 2.762 gal. Volume: 10.45 L. Volume: 0.3692 ft^3. Water Weight: 23.04 lbs. Fill Time: 5.52 min

With Pipe Inner Diameter = 0.475, Pipe Length = 300 and Flow Rate = 0.5 as the stated inputs, the result is Volume = 2.762 gal, Volume = 10.45 L and Volume = 0.3692 ft^3. Each value corresponds to the declared output fields.

Example 4: Fire sprinkler main: 4-in steel pipe, 150 ft cross main

Inputs

pipe_id: 4.026 pipe_len: 150 flow_rate: 250
Volume: 99.197 gal. Volume: 375.5 L. Volume: 13.2607 ft^3. Water Weight: 827.47 lbs. Fill Time: 0.4 min

With Pipe Inner Diameter = 4.026, Pipe Length = 150 and Flow Rate = 250 as the stated inputs, the result is Volume = 99.197 gal, Volume = 375.5 L and Volume = 13.2607 ft^3. Each value corresponds to the declared output fields.

Common Use Cases

  • Calculate water volume in a long water supply line
  • Determine pipe purge/flush volume for system commissioning
  • Estimate water weight for a piping system