BS 6620-1:1991

This standard BS 6620-1:1991 Industrial plate screens is classified in these ICS categories:

• 19.120 Particle size analysis. Sieving

This part of ISO 7805 describes three patterns using round (circular) and square perforations in low carbon steel plate of 3 mm thickness and above; the sizes of holes ranging from 125 to 3,15 mm inclusive. Five ratios of pitch to hole are prescribed which result in nominal areas ranging from about 64 to 23 %. Tolerances for both hole and pitch are given.

As this part of ISO 7805 provides a diversity of choice, it is unlikely that every one of the many possible combinations of size of hole, pitch and plate thickness will be manufactured. The selection for national standards for industrial plate screens should be made from those combinations which suit the products and screening methods in the country concerned.

Industrial plate screens of thicknesses below 3 mm are dealt with in ISO 7805-2.

Describes three patterns using round and square perforations in plate of 3 mm thickness and above.