1. What is the Length of Tank Formula?

The Length of Tank formula calculates the required length of a sedimentation tank based on flow velocity, depth, and settling velocity. This calculation is essential in water treatment and sedimentation processes to ensure proper particle settlement.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( L \) — Length of tank (m)
• \( V_f \) — Flow velocity (m/s)
• \( d \) — Depth of tank (m)
• \( v_s \) — Settling velocity (m/s)

Explanation: The formula determines the minimum tank length required for particles to settle out of the flow based on the relationship between flow velocity, tank depth, and particle settling characteristics.

3. Importance of Tank Length Calculation

Details: Proper tank length calculation is crucial for efficient sedimentation processes in water treatment plants, ensuring adequate residence time for particles to settle and improving water quality.

4. Using the Calculator

Tips: Enter flow velocity in m/s, depth in meters, and settling velocity in m/s. All values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is settling velocity?
A: Settling velocity is the terminal velocity at which particles settle in a fluid under gravity, depending on particle size, density, and fluid properties.

Q2: How does flow velocity affect tank length?
A: Higher flow velocities require longer tanks to provide sufficient time for particles to settle before the water exits the tank.

Q3: What is the typical range for settling velocities?
A: Settling velocities vary widely depending on particle characteristics, typically ranging from 0.001 to 0.1 m/s for most sedimentation applications.

Q4: Can this formula be used for all types of sedimentation tanks?
A: This formula is primarily used for rectangular sedimentation tanks. Different tank geometries may require modified calculations.

Q5: How does tank depth influence the calculation?
A: Greater tank depths require longer lengths to maintain the same horizontal flow velocity and provide adequate settling time for particles.