Document JgbGnXeLXeB2nO8RezQ2DbJr

9 f ' i T a*fl Pi* oo* _ `J --^ mm M 1 M Vo-~.. 327 Asbestos Pest. Anon. Safety Rev, (U.S. Navy), jt, 13 (Jan., 1947) i The brief article calls attention to the hazard of exposure to astes- /-----tos dust and the need of adequate localized ventilation. All working places vith possible exposure should be checked for asbestos dust, and where 1 mechanical exhaust ventilation crust be supplemented by wearing of personal protective equipment, it should confora to. Bureau of Mines specifications. 323 Anon. Compressed Air Hag., 2, 49 (Feb., 1947) At the Kerr-Addison Hill in Virginiqtown, Ontario, cans of cyanide to be used in the extraction of gold from ores, are handled mechanically by a system that is completely inclosed and controlled from the outside. Except for loading and unloading, the operation is automatic. After a can has been placed on the skip and the chamber has been closed, it is hoisted by an air cylinder. At..the limit of its travel it is tripped and its contents are dumped into the hopper of a reagent feeder that'discharges into condi tioner tanks. Reversal of the piston stroke returns the skip to the starting position; but before the empty is replaced by a full container, the fumes and duct in the enclosure are exhausted to the atmosphere. Thus hand dumping with its attendant skin rashes are avoided. Diagrams are presented. ?29 T>:st Control Legyans fro? Fnrt?_r.* Dorn. F.N. Chirico. Occ. Hazards, 24-25 (Feb., 1947) Certain features of the dust control system introduced during the construction of Fontana Data in North Carolina were not 00X7 unique but because of their extreme effectiveness in curtailing hazards have become a pattern for th industry. The most radical of those features was a mechanical water spray mounted on the frames of the electric shovels, continuously and thoroughly wetting the rock. This process reduced dust concentrations to averages of 1.4 to 2.7 U.P.C.F., and was much more efficient than intermittent hand wetting. It was also unnecessary to-xet the rock during crushing--a point at which hand wetting has been found undesirable. Elimination of dust fog also increased night visi bility. Other dust-reducing features included wet drilling, efficiently designed ventilation systems, total enclosure of indoor screens, with self-closing doors, top and skirt-board coverings at transfer and dis charge points, dust-tight manholes, counterweignted hinged covers on chutes, discharge of the dust collector effluent through high stacks, and the installation of water sprays with conveniently located shut-off valves. Specially designed ejector ventilation systems were installed in the cement unloading plant, supplying clean air to the workers and removing the cement dust which was subsequently collected. An average of less than 10 M.P.C.F. was attained at that point, less than five in the concrete mixing plant, and less than four in the quarry end rock crushing plant. 330 P.eoort__on _en Irv*gtiT>n<rt end V*rt.ilgtion Conditl-ms in the Comer lfir.es ard t.h<a s--'/*r>Q -in f^rthem Part.! -- ruler Reference to-31Il~>ri^ . J. De V. Lanbrechts. 42 pp. Lusaka: Govt. Printer. (1945) The emphasis in this report is upon dust.. It is recommended that dust sampling results fora a basis for ventilation requirements. Depths (.c FUi:rrirF's exhibit so-, -. V Q1 CASE SO- > O.-j -'r- .F^rv, -R5 > . WW^t-W-i Ml >-. ;J ';';v'*.;.;v:-f '- a'*-* '' .* \J`.';?*.'* *- :-;</^-:-TV.' '"' '. ..* :'t-''*`- - >.^` . ~` * '_ "- -`A1" i t T r-n a U., PI^r9ing*t _ <?*? 327 flsbestoa Dust. Anon. Safety Rev. (U.S. Navy), a, 13 (Jan., 1347) / The brief article calls attention to the hazard of exposure to ssbes- 'Z----- to3 dust and the need of adequate localised ventilation. All working places with possible exposure should be checked for asbestos dust, and where i mechanical exhaust ventilation cust be supplemented by wearing of personal protective equipment, it should conform to. Bureau of Mines specifications. 223 M r-Orersted Pv-yg flrwrrjda th Anon. Compressed Air Mag., _2, 49 (Feb., 1947) At the Kerr-Addieon Mill in Virgin!,town, Ontario, cans of cyanide to be used in the extraction of gold from ores, are handled mechanically by a system that is completely inclosed and controlled from the outside. Except for loading and unloading, the operation is automatic. After a can has been placed on the skip and the chamber has been closed, it is hoisted by an air cylinder. At..the limit of its travel it is tripped and its contents are dumped into the hopper of a reagent feeder that discharges into condi tioner tanks. Reversal of the piston stroke returns the skip to the starting position; but before the empty is replaced by a full container, the fumes and dust in the enclosure are exhausted to the atmosphere. Thus hand dumping with its attendant skin rashes are avoided. Diagrams are presented. 322 TVst Control Lesson* Fnntqnw Dam.. F.N. Chirico. Occ. Hazards, j*, 24-25 (Feb., 1947) Certain features of the dust control system introduced during the construction of Fontana Dam in North Carolina were not only unique but because of their extreme effectiveness in curtailing hazards have become a pattern for th* industry. The most radical of those features was a mechanical water spray mounted on the frames of the electric shovels, continuously and thoroug~il7 wetting the rock. This process reduced dust concentrations to averages of 1.4 to 2.7 M.P.C.F., and was much more efficient than intermittent hand wetting. It was also unnecessary ta-xet the rock during crushing--a point at which hand wetting has been found undesirable. Elimination of dust fog also increased night visi bility. Other dust-reducing features included wet drilling, efficiently designed ventilation systems, total enclosure of indoor screens, with self-closing doors, tap and skirt-board coverings at transfer and dis charge points, dust-tight manholes, counter-weighted hinged covers on chutes, discharge of the dust collector effluent through high stacks, and the installation of water sprays with conveniently located shut-off valves. Specially designed ejector ventilation systems were installed in the cement unloading plant, supplying clean air to the workers and removing the.cement dust which was subsequently collected. An average of less than ID M.P.C.F. was attained at that point, less than five in the concrete nixing plant, and less than four in the quarry end rock crushing plant. 330 Peoort on an Thist and V^ntdIqtlon Condition*? *n the (pnrper TMines *nd t.Ho Pmt-pn Y^n* * n iiorthere Rhodesia with Parti cular P^ferenea-ta . J, Da V. Lanbrechts. 42 pp. Lusaka: Govt. Printer. (1945) The emphasis in thi3 report is upon dust.. It is recommended that dust sampling results fora a basis for ventilation requirements. Depths r