Boiler water pump how to calculate the head

Heating and Closed Circulation System of the water pump head = water supply head to fill the point of the pressure head - the supply tank water level + replenishment pipeline itself along the head and the local head loss and the sum.
  Boiler water pump flow and head calculation formula:
        The effective energy obtained by the unit weight of the liquid flowing through the pump. Is the pump's important performance parameters, also known as pressure head. Can be expressed as the pressure of the fluid head, kinetic energy head and bit energy head increases, that is
        H = (p2 - p1) / ρg + (c2 ^ 2 - c1 ^ 2) / 2g + z2 - z1
        Where H - head, m;
        P1, p2 - pump inlet and outlet of the liquid pressure, Pa;
        C1, c2 - fluid at the pump inlet and outlet flow rate, m / s;
        Z1, z2 - import and export height, m;
        Ρ - liquid density, kg / m3;
        G - gravity acceleration, m / s2.
        Replenishment pumps and feed pumps are calculated in the same way. The flow rate of the replenishment pump Q is determined by the need, that is, the amount of boiler water per unit time.
        The head of the replenishment pump is determined by the height of the water, the head of the boiler pressure, and the loss of the head along the pipeline and the head loss. The pipe length is L, the resistance coefficient is k, the resistance coefficient is j, the height of water is Z, the boiler pressure is P, the density of water is p, and the acceleration of gravity is expressed by g, then the water pump head: H = Z + P / (pg) + (kL / D) V ^ 2 / (2g) + jV ^ 2 / (2g) where the average velocity V = 4Q / (3.14D ^ 2) and D is the tube diameter. For the circulating pump, the flow of course depends on the need, the flow is determined, calculate the total return of the loop is the head of the water pump head.
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