1. What is Total Dynamic Head (TDH)?

Total Dynamic Head (TDH) is the total equivalent height that a fluid is to be pumped, taking into account friction losses in the pipe. It's a crucial parameter for selecting and sizing pumps in water systems.

2. How Does the Calculator Work?

The calculator uses the basic TDH formula:

Where:

• \( Static\ Head \) — Vertical distance from water source to discharge point (feet)
• \( Friction\ Loss \) — Pressure loss due to pipe friction (feet)

Explanation: The static head represents the vertical lift, while friction loss accounts for resistance in the piping system. The sum determines the total work the pump must perform.

3. Importance of TDH Calculation

Details: Accurate TDH calculation is essential for proper pump selection. An undersized pump won't deliver required flow, while an oversized pump wastes energy and may cause system damage.

4. Using the Calculator

Tips: Measure static head as vertical distance from water source to discharge point. Friction loss can be calculated separately based on pipe size, length, material, and flow rate before using this calculator.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between static head and dynamic head?
A: Static head is the vertical distance only, while dynamic head includes friction losses and velocity head (though velocity head is often negligible in water systems).

Q2: How do I determine friction loss?
A: Use the Hazen-Williams equation or friction loss charts based on pipe diameter, length, material (C factor), and flow rate.

Q3: Does pipe elevation affect TDH?
A: Only the net vertical difference (static head) matters, not the pipe route's horizontal distance or elevation changes.

Q4: What units should I use?
A: Consistent units are essential. This calculator uses feet for both static head and friction loss.

Q5: Should I add a safety factor?
A: Many engineers add 10-20% to calculated TDH to account for system aging and unanticipated losses.