| | 
This insertion turbine flow measurement system has been especiallydesigned for installation in larger diameter pipelines, that is, forpipe diameters from 40 up to 900mm. The insertion turbine combines proven technology with modern materials and design, producing an inexpensive metering system suitable for retrofit in permanent installations.
Some typical applications for this type of instrument in thesekinds of pipes would be in water distribution mains, fire hydrant monitoring, boiler feed measurement, irrigation systems, district heatingand HVAC systems.
The turbine has a radial type rotating element, sometimes referred to as an “undershot water wheel,” which rotatesfreely on graphite/PTFE impregnated PEEK bearings, with specially aerofoil shaped blades to extend the dynamic range of the meter. The specially contoured housing further improves the meter linearity particularly at lower fluid velocities.
The meter contains two styles of electrical sensor output, one self-powered and used with battery-operated equipment, and the other an open collector transistor providingoutput pulses. The body is manufactured from AISI316 stainless steel and as standard is supplied with three metres of five core screened instrument cable.
All the electronic displays from the Metra-florange are offered for use with the sensor, providing display, totalisation or batch control. These can all be mounted directly onto the meter, via a mounting stalk: Metra-view and Metra-Smart can be self powered, permitting their use in remote areas or for portable use, whereas Metra-batch requires an external power source.
The meter couldalso be used as a portable meter that can be carried around to variousmetering locations. Installation from the side of the flow line is made via a 1.5” BSP or NPT fitting, and versions are available for ‘hot-tap’ insertion into pressurised lines.
Due to the relatively small disturbance the metering head introduces to the pipe, pressure losses for this type of flowmeter are very low making energy savings by reducing pumping costs.
| |
