This training rig consists of a mobile frame that supports various level and flow measurement and control components. Mounted on the lower shelf is a 100-litre stainless steel water storage tank, which supplies either of the rig’s two independent systems via a peripheral pump and an actuated T-port ball valve.
The water can be directed into one of two paths:
- A 45-litre clear acrylic water level measurement tank, or
- A series of clear acrylic flow measurement components, which are connected to a manometer board.
A check valve is installed between the storage tank and the pump to prevent backflow from the measurement tank when the pump is switched off. A bypass line with a manual ball valve is provided around the check valve, enabling drainage of trapped water from the flow system after operation, or to demonstrate siphoning from the measurement tank when required.
The water level measurement tank is equipped with:
- Three float switches for low, high, and high-high level alarms, used for automated pump control
- An ultrasonic level transducer mounted above the tank, with a connected air temperature sensor for automatic calibration
- A modulating actuated ball valve for tank drainage, returning water to the main storage tank
In addition, a bubble tube system is installed to enable level and density measurement via two differential pressure transmitters. Compressed air is supplied through the rig’s pressure regulator, which splits into three independent flow controllers:
- One controller vents to atmosphere
- Two supply dip leg tubes of varying lengths inside the tank
Manifold valves allow each transmitter to measure differential pressures:
- Transmitter 1: Pressure difference between the long dip leg and atmosphere
- Transmitter 2: Pressure difference between the long and short dip legs
Flow Measurement System Components
Sudden Enlargement
- Inlet Diameter: 17 mm
- Outlet Diameter: 27 mm
Venturi Tube
- Inlet/Outlet Diameter: 27 mm
- Throat Diameter: 13.5 mm
- Convergent Angle: 21°
- Divergent Angle: 8°
Orifice Plate
- Inlet/Outlet Diameter: 27 mm
- Orifice Diameter: 13.5 mm
- Effective Thickness: 0.54 mm
- Downstream Taper: 45°
- Rotameter
Flow Range: 150 – 1600 L/hr
Electrical and Control Systems
All electrical components are powered via a 415V AC control panel, which includes readout displays. Instrumentation signals are routed through a 24V DC marshalling cabinet, where knife-edge terminals allow individual devices to be safely isolated for calibration.
The rig is UKCA marked.
