This is a self-contained water circulating unit for studying the friction losses in pipes, pipe fittings, and valves; and to determine coefficients of discharge for primary flow measuring devices at various flow rates.

The unit consists of a pump, a storage tank and a water proof panel on which all friction loss components and the flow measuring devices are arranged.

Friction loss is measured by a pressure drop and coefficient of discharge is determined from a pressure drop and a flow rate. Flow rate is obtained from a water meter and a stop watch. The pressure drop is measured by differential pressure using manometer and differential pressure gauge. Pressure tapping is by small ball valves with quick connection. All pressure taps are connected by flexible hoses to a set of specially arranged manifolds such that differential pressure across any component can be measured simply by opening valves without removing the hoses. The unit is on a steel frame on wheels.

Instruction manual is also included.

  • Friction losses in straight pipes at various flow rates.
  • Friction losses in pipe fittings, valves, sudden expansion and contraction at various flow rates.
  • Friction losses in primary flow measuring devices and comparison of coefficients of discharge at various flow rates.
Primary flow measuring devices made from clear acrylic:
- Venturi tube
- Orifice plate
- Pitot tube


Friction loss components:
- Linear pipes, PVC 3 different diameters.
- Linear pipe, stainless steel 1 ea.
- Valves Gate, globe, ball and check
- Short radius bends 2 ea.
- Long radius bends 2 ea.
- Regular elbow 1 ea.
- 45o elbows 2 ea.
- 45o Y 1 ea.
- Other components Tee section
  Inline strainer
  Sudden expansion
  Sudden contraction


Measuring instruments
- Water meter and stop watch.
- Water manometer with hand air pump
- Differential pressure gauge
Power supply 220 V, 1 Ph, 50 Hz. Other power supply is available on request.
Part No. Part Name
HF 011 Variable area flow meter.
HF 013 ISA nozzle.
HF 020 Polyethylene Polybutylene or ABS pipe.
HF 021 Galvanized steel pipe.
HF 022 Artificially roughened pipe.
HF 023 Annular pipe.
HF 024 Flexible hose.
HF 033A Differential pressure digital display instead of differential pressure gauge.
HF 033B

Mercury manometer instead of differential pressure gauge.

Note: Due to transport laws mercury cannot be supplied. Buyer must source it locally.

HF 033C Portable differential pressure meter instead of differential pressure gauge.
HF 034A Portable differential pressure meter instead of water manometer.
HF 135-050

Computer Interface

Sensors with computer interface unit for key data acquisition instead of
analog data measuring instruments. This includes computer interface unit
with flow and differential pressure sensors (high and low ranges).

HP 009 Pressure gauges at pump inlet and discharge for pump pressure vs
flow rate curve.
HP 010 Flow digital display
Other pipes and fittings can be supplied on request.
Other optional equipment please contact manufacturer (essom@essom.com)


Net (unassembled) Shipping Dimensions WxLxH 90 x 245 x 105 cm.
Net Weight Approx. 160 kg.