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 both the static head (vertical lift) and friction losses in the system. It's a crucial parameter for selecting and sizing pumps.

2. How Does the Calculator Work?

The calculator uses the TDH formula:

Where:

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

Explanation: The static head is the actual vertical lift, while friction loss accounts for resistance in pipes, fittings, and valves.

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 operational issues.

4. Using the Calculator

Tips: Enter static head (vertical lift) and friction loss in feet. Both values must be positive numbers. Friction loss can be calculated separately using pipe flow calculators.

5. Frequently Asked Questions (FAQ)

Q1: How do I determine friction loss?
A: Friction loss depends on pipe diameter, length, material, flow rate, and number of fittings. Use hydraulic tables or online calculators.

Q2: Does TDH include pressure requirements?
A: Yes, pressure requirements at discharge are converted to equivalent head (1 psi ≈ 2.31 ft of water head).

Q3: What's a typical TDH range for residential systems?
A: Most residential systems have TDH between 30-100 ft, depending on elevation changes and piping layout.

Q4: How does pipe size affect TDH?
A: Larger pipes reduce friction loss but increase initial cost. Optimal pipe size balances installation cost with pumping energy costs.

Q5: Should I add a safety factor to TDH?
A: It's common to add 10-20% safety factor to account for system aging, fouling, or future expansion.