For the proper operation of the biggest and smallest hydro turbine generators it is desirable to remove all debris and coarse sediments from the process water. Where adaquate head is available the Hydro-Shear Coanda Effect screen is particularly well suited for this application. Regulations often require that all diverted water be screened to exclude the passage of fish into the penstock and through the turbines. The screens will exclude all fish from the diverted water. Their effectiveness has been shown by numerous case histories and studies. (references will be furnished upon request) Large multi-screen diversions include stoplogs on the crest of the dam to prevent the screen from taking all the water, leaving a section of dry screen which could damage young fish.

Small hydro units are especially vulnerable to debris and sediments. The smaller orifices are often plugged and the jets which direct water to a pelton wheel or impeller are eroded and worn by any sediment in the water. The Hydro-Shear Coanda Effect screens will protect your investment, reduce or eliminate the need for frequent screen maintenance, and insure continuous turbine operation under most normal circumstances.

Microhydros are most susceptible to plugged nozzles, and require a screened diversion for trouble free operation. Hydroscreen has a complete line of screens and boxes for this application. You can purchase the screen separately, or the screen and box together for easy installation. Contact Hydroscreen for help with the most cost effective screen sizing.

Large and small turbines have one thing in common, the need to remove all debris and sediments. This is even more critical with high head pelton turbines where the nozzles and valves will plug or severely wear when debris or sediments are present.

Anyone who operates such a unit is critically aware of the problem. In addition, if you have ever walked up the hill to take leaves, pine needles and trash off the intake screen, you have an appreciation, and need, for a self cleaning intake screen. The Hydro-Shear Coanda Effect screen will eliminate these problems.

Hydroscreen has furnished screens to a number of leading pelton turbine manufacturers such as Canyon Industries of Deming, Washington. From the smallest to the largest pelton turbines, the removal of damage causing debris and sediments is a prime design consideration.