When designing and dimensioning pipe systems, the knowledge of pressure loss occuring at different piping elements is very important. The trainer HM 122 enables the experimental determination of important coefficients related to pressure loss. It is also possible to study the pressure curve along typical pipe sections.

  The trainer contains three straight pipe sections made of different materials and with different diameters. Additionally, there is a pipe section with bends, a pipe section with contraction and enlargement and a pipe section with interchangeable valves and fittings.

  Each pipe section is fitted with at least five pressure measuring points. Together with the considerable pipe section length of 2,5m, very exact measurements can be performed and the linear pressure drop along a pipe can be demonstrated and proved.

  A rotameter and a volumetric measuring tank are included for comparative measurements and for exercises on calibration. A 8-tube manometer, a Bourdon tube manometer and a pressure sensor can be used to measure pressures and differential pressures. The pressure measuring points are realised with annular chambers for pressure measurement without interaction.

  The trainer contains a closed water circuit with a tank and a submerged pump. Therefore, the trainer can be used independently of a water network at different locations, e.g. class rooms or labs.

  The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments. 

- Fundamentals of flow rate measurement
- Fundamentals of pressure measurement
- Determination of pipe friciton coefficients for

  different pipe materials and pipe diameters

- Resistance coefficients for bends, enlargements

  and contractions

- Pressure loss and opening characteristic curves

  of valves and fittings