What is TDH for pool pump?

Total Dynamic Head
Total Dynamic Head (TDH) refers to the total equivalent height that a fluid will be pumped by taking into consideration any friction losses in the pipe. Essentially “dynamic head” is the measurement of resistance working against your pool pump as it pulls water from your basin and pushes it back to the pool.

How do you calculate TDH in a pool?

CALCULATE TDH – Multiple the Vacuum gauge reading x 1.13. Multiply the Pressure gauge reading x 2.31. Add the two products together to determine TDH for your system. Our readings were 15 and 23 respectively So (15 x 1.13) + (23 x 2.31) = 17 + 53 or 70 TDH.

How do you calculate TDH?

Total Dynamic Head (TDH) = (Static Water Depth + Drawdown + Additional Lift) + Frictional Losses in Pipe

1. Some creative ways to approximate Static Water Depth:
2. Estimating Drawdown for your well:
3. Estimating Frictional Losses over distance of pipe:
4. Calculating Additional Lift:
5. Pumping into Pressure Systems:

What is the return on a pool pump?

Returns: Pool water returns are places in the pool where water comes back in from the circulation system. A typical pool has two or three returns depending on the pool size.

How far can a pump push water?

In a water well, the weight of the atmosphere is acting on the surface of the water down in the well. The pump at ground level acts as the source of vacuum and has a theoretical lifting capability of about 30 feet (It would lift 34 feet if it could create a perfect vacuum).

Should pool pump be full of water?

When working correctly, pool pumps should be completely full of water. This is ok as long as the water level does not continue to fall and cause the pump to run dry.

Why do I have two pool pumps?

The additional pump can result in improved filtration, faster pool warm-up times, and better chlorine distribution thanks to a more efficient circulation. A pool booster pump would also give you a choice to increase pressure when needed and to run water features that require more pressure.

How much water pressure do you lose per foot?

Elevation Change To push water uphill it will require pressure and if water goes downhill then you will gain pressure. An easy calculation to know is that for every 10 feet of rise you lose -4.33 psi. For every 10 feet of fall in elevation, you will gain +4.33 psi.

How to calculate TDH for a pool pump?

Since pool pumps give different water flow rates and resistance levels, it is important to select the right pump for the pool system. To calculate the correct TDH for the swimming pool the readings from two gauges will be needed. The pressure gauge will measure the pressure in pounds per square inch, also known as PSI.

Why does my pool have a high TDH?

A roof mounted solar heater is one of the biggest causes of resistance in residential swimming pools. It will create a high TDH because of the resistance created in pushing the water through an elevated system that can exceed 10 feet.

How does the vacuum gauge work on a TDH pump?

The vacuum gauge is needed to measure the suction, in inches of mercury, also known as Hg. The Hg gauge inserts into the suction side of the existing pump. After inserting both gauges, release the pressure on the system from the filter relief valve. For the most accurate measure of the TDH, test with a clean filter.

Is it important to calculate total dynamic head before replacing pool pump?

Before replacing the pool pump, its important to calculate the Total Dynamic Head. If the TDH is higher than what the pump is rated for, it can result in inadequate flow and filtration leading to higher chemical demands and unclean water, it can also damaged equipment.