Document V3vnqmEqYg9oLLMggw9ZL3mww

Preliminary Dust Surrey Tor Asbestos Textile Institute, June, 1947 9 All fire of the systems describe! In the table serve their.purpose satisfactorily from the viewpoint of operation, but it does not mean that they vould be.equally satisfactory to others. Crus the plant vlth high ex haust capacity (0) has a unique Interplant tunnel connection, so that excess heat from another plant supplies replacement air vithcrut added cost, for heat, or vinter discomfort. Plant E controls dust by completely bousing each pair of cards in a. spacious room, exhausted at a rate of 2000 'cfB. Sldevalls are easily remov ed for repairs. Host plants vould not.prefer this arrangement. As far as the dust count data can ehov, the card room of Plant B vlth 2200 cfia is equal If not superior to that of Plant E vlth 3800 efts, a . recently Installed system, The fundamental features of best card dust control systems observed ere as follower 1. Vood enclosure vlth hingeing arrangement. 2. Liberal clearance betveen verifier rolls and curve of cover permitting air passage at loir velocity. 3; large chamber connection on corer, to duot. 4. Duct breach not over 5", preferably if". 5. Uo blast gate dampers In branch line. 6. Exhaust influence over comb, either by extension of. main cover or by separate hoods. 7. Exhaust space under machine, not over 4" duct. ^ 8. Enclosure and exhaust of feed hopper, not over 4" duct. TVo Installations Include an exhaust branch to prevent the escape of dust originating in the space between the ring doffers and the main cylinder.