Head

This article or the following section is not adequately provided with supporting documents ( e.g. individual evidence ). Information without sufficient evidence could be removed soon. Please help Wikipedia by researching the information and including good evidence.

The delivery head  H of a liquid pump is understood as the useful work that is transferred from the pump to the delivery medium , based on the weight of the medium; it is therefore a specific quantity : ${\displaystyle W}$ ${\displaystyle m\cdot g}$

${\displaystyle H={\frac {W}{m\cdot g}}}$

The following equation is identical to the equation for the pipe characteristic:

${\displaystyle H=\underbrace {\frac {p_{a}-p_{e}}{\rho \cdot g}} _{>0}+{\frac {v_{a}^{2}-v_{e}^{2}}{2\cdot g}}+(z_{a}-z_{e})+H_{v}}$

With

${\displaystyle H}$ Delivery head in m

${\displaystyle _{a}}$ pressure vessel

${\displaystyle _{e}}$ Suction container

${\displaystyle p}$ Pressure in  Pa  (= N / m²)

${\displaystyle v}$ Speed ​​in m / s

${\displaystyle \rho }$ Density of the pumped liquid in kg / m³

${\displaystyle g}$ Gravitational acceleration  = 9.81 m / s²

${\displaystyle z}$ Inflow height of the liquid level in m

${\displaystyle H_{v}}$ Pressure loss height in the pressure and suction line in m.

The difference between the inlet heights is called the geodetic suction height . ${\displaystyle z_{a}-z_{e}}$

In the case of water, the rule of thumb is that one bar of pressure corresponds to a maximum delivery head of approx. 10 m.

See also

• Hydraulic potential
• Nozzle work
• Energy level