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2. Total dynamic head - Wikipedia

   en.wikipedia.org/wiki/Total_dynamic_head

   In fluid dynamics, total dynamic head (TDH) is the work to be done by a pump, per unit weight, per unit volume of fluid.TDH is the total amount of system pressure, measured in feet, where water can flow through a system before gravity takes over, and is essential for pump specification.

3. These Pool Filters Keep Your Water Clean, Clear, and Ready ...

   www.aol.com/pool-filters-keep-water-clean...

   For instance, if your pool is 5,000 gallons, you’ll need a 500 GPH or 8.3 GPM pool filter. We recommend erring on the larger side, so you don’t end up with a filter that maxes out at your pool ...

4. Gross margin - Wikipedia

   en.wikipedia.org/wiki/Gross_margin

   Using gross margin to calculate selling price Given the cost of an item, one can compute the selling price required to achieve a specific gross margin. For example, if your product costs $100 and the required gross margin is 40%, then Selling price = $ 100 1 − 40 % = $ 100 0.6 = $ 166.67 {\displaystyle {\text{Selling price}}={\frac {\$100}{1 ...

5. Affinity laws - Wikipedia

   en.wikipedia.org/wiki/Affinity_laws

   The affinity laws (also known as the "Fan Laws" or "Pump Laws") for pumps/fans are used in hydraulics, hydronics and/or HVAC to express the relationship between variables involved in pump or fan performance (such as head, volumetric flow rate, shaft speed) and power. They apply to pumps, fans, and hydraulic turbines. In these rotary implements ...

6. Flow measurement - Wikipedia

   en.wikipedia.org/wiki/Flow_measurement

   The turbine flowmeter (better described as an axial turbine) translates the mechanical action of the turbine rotating in the liquid flow around an axis into a user-readable rate of flow (gpm, lpm, etc.). The turbine tends to have all the flow traveling around it. The turbine wheel is set in the path of a fluid stream.

7. Annular velocity - Wikipedia

   en.wikipedia.org/wiki/Annular_velocity

   PO gpm = pump output in gpm (gallons per minute) 1 gallon = 0.0238095238 barrels; ID 2 = inside diameter of the wellbore or casing, squared; OD 2 = outside diameter of the drill pipe or tubing, squared; 1029.4 = A conversion factor constant used to calculate the volume between the outside of a tube within the inside of another tube, using barrels.