Flow Capacity Coefficient of Strainers

Abstract

The values of hydraulic specifics of the prototypes of new DN 50, DN 80, DN 100, DN 150 and DN 200 strainers have proven their enhanced hydraulic properties. These are a result of both increased screening surface of the filter insert, as well as the improved shape of the filter bodies. These conclusions were confirmed in the course of examinations of the DN 80 and DN 200 filter bodies. The performed measurements of new filters with screen inserts have revealed an average growth of 43 % of the K _v flow coefficient in case of all examined products. The maximum growth of the flow coefficient, amounting to 55 %, was recorded with regard to filter DN 200. During the tests also the possibility of estimating the K_v coefficient value was checked with regard to the entire filter series. By means of dimensional analysis and the similitude concept, on the basis of a given product it is possible to obtain K_v values of filters at a maximum tolerance of 10 %.