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Products  |  Fluid Mechanics  |  Steady Incompressible Flow  |  HM 122
HM 122 Pressure Loss in Pipes Show data sheet (pdf file) Print page
Technical Description

  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. 


Learning Objectives / 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



* Resistance and loss for turbulent pipe flow1

* Closed water circuit with tank and pump1
* Long measuring sections with several pressure

  measurement points1
* Annular chambers for pressure measurement

  without interaction

Alternative products
HM 112 -- Hydrodynamics Trainer / PC

[1] Investigation of pressure loss
[2] 3 long pipe sections with different diameters made of copper and steel
[3] Pipe section with bends
[4] Pipe section with sudden contraction and enlargement
[5] Pipe section with interchangeable valves and fittings with different opening characteristics: needle valve, shut-off valve, ball valve

[6] Determination of pressure curve along the measuring section with up to 8 pressure measuring points
[7] Annular chambers for pressure measurement without interaction

[8] Measurement of pressure and differential pressure using 8-tube manometer, Bourdon tube manometer and differential pressure sensor
[9] Rotameter and volumetric tank to measure the flow rate

[10] Closed water circuit with tank and submerged pump
[11] Tanks made of stainless steel


Technical Data


- power consumption: 0,78kW

- max. flow rate: 13,5m/h

- max. head: 11,1m

3 straight pipe sections, measuring length: 2,5m
- copper, diameter=28x1mm, 22x1mm

- steel, diameter=1/2"
Pipe section with bends: steel, D=22x1mm

Pipe section with sudden contraction/enlargement

- copper

- contraction: D=18x1mm

- enlargement: D=28x1mm

Pipe section with valves: copper, D=18x1mm

Volumetric measuring tank: 20L
Water tank: 70L
Measuring ranges
- pressure: -1...1,5bar
- differential pressure: 1x 0...+/-350mbar,

  8x 0...1000mmWC
- flow rate: 1x 400...4000L/h

Dimensions and Weight
LxWxH: 3260x790x1930mm
Weight: approx. 325kg
Required for Operation
230V, 50/60Hz, 1 phase or 120V, 60Hz/CSA, 1 phase
Scope of Delivery

1 trainer

1 set of accessories (hoses, stop watch)

1 set of instructional material

Order Details

070.12200  HM 122  Pressure Loss in Pipes

© 2005 G.U.N.T. Gerätebau GmbH