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  2. Population equivalent - Wikipedia

    en.wikipedia.org/wiki/Population_equivalent

    For example, a commonly used definition used in Europe is: 1 PE equates to 60 gram of BOD per person per day, and it also equals 200 liters of sewage per day. [3] [4] [5] In the United States, a figure of 80 grams BOD per day is normally used. [6]: 171 If the base value is taken as 60 grams of BOD per person per day, then the equation to ...

  3. Hydronic balancing - Wikipedia

    en.wikipedia.org/wiki/Hydronic_balancing

    Hydronic balancing, also called hydraulic balancing, is the process of optimizing the distribution of water in a building's hydronic heating or cooling system by equalizing the system pressure. In a balanced system every radiator is set to receive the proper amount of fluid in order to provide the intended indoor climate at optimum energy ...

  4. Circulator pump - Wikipedia

    en.wikipedia.org/wiki/Circulator_pump

    The traditional hot water recirculation system uses the existing cold water line as return line from the point of use located farthest from the hot water tank back to the hot water tank. The first of two system types has a pump mounted at the hot water heater while a "normally open" thermostatic control valve gets installed at the farthest ...

  5. Net positive suction head - Wikipedia

    en.wikipedia.org/wiki/Net_positive_suction_head

    Example Number 3: A well or bore running at 70 degrees Celsius (158F) with an operating level of 5 metres below the intake, minus a 2 metre friction loss into pump (pipe loss), minus the NPSH R curve (say 2.4 metres) of the pre-designed pump, minus a temperature loss of 3 metres/10 feet = an NPSH A (available) of (negative) -12.4 metres.

  6. M1918 Ford 3-ton tank - Wikipedia

    en.wikipedia.org/wiki/M1918_Ford_3-ton_tank

    The Ford 3-ton tank, also known as the Ford Model 1918 (M1918) was one of the first indigenous tank designs by the U.S. It was a small two-man, one-gun tank. It was a small two-man, one-gun tank. Essentially the first tankette , it was armed with an M1917 Marlin machine gun , later an M1919 Browning machine gun , and could reach a maximum speed ...

  7. Circulating water plant - Wikipedia

    en.wikipedia.org/wiki/Circulating_Water_Plant

    A circulating water plant or circulating water system is an arrangement of flow ... CW pumps are designed as per IS:9137, [2] [3] ... Rectangular pressed steel tanks ...

  8. Volumetric flow rate - Wikipedia

    en.wikipedia.org/wiki/Volumetric_flow_rate

    Volumetric flow rate should not be confused with volumetric flux, as defined by Darcy's law and represented by the symbol q, with units of m 3 /(m 2 ·s), that is, m·s −1. The integration of a flux over an area gives the volumetric flow rate. The SI unit is cubic metres per second (m 3 /s). Another unit used is standard cubic centimetres per ...

  9. Pressure tank - Wikipedia

    en.wikipedia.org/wiki/Pressure_tank

    The diaphragm or bladder may itself exert a pressure on the water, but it is usually small and will be neglected in the following discussion. Case 1 is an empty tank at the charging pressure P c (gauge). The total volume of the tank is V t. Case 2 is a tank in use, with the air pressure at pressure P (gauge) and a water volume of V