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Document ID (ISN)38801
CIS number 82-2040
ISBN(s) 951-801-282-2
Year 1982
Convention or series no. Tutkimuksia 181
Author(s) Niemelä R., Heikkilä P., Rantanen S., Liius R., Lund G.
Title Local exhaust systems and air contaminants in hot dip galvanising
Original title Kuumasinkitysaltaiden kohdepoistot ja ilman epäpuhtaudet [in Finnish]
Bibliographic information Tiöterveyslaitos, Laajaniityntie 1, 01620 Vantaa 62, Finland, 1982. 50p. Illus. 20 ref. Price: Fmk.20.00.
Abstract The composition and concentrations of fumes released during hot dip galvanising were determined and effectiveness of local exhaust ventilation systems in hot dip galvanising shops were assessed. Fume concentration and composition were measured in 9 plants, and ventilation effectiveness was determined in 5 plants. The main source of fume was usually the flux, and fume composition was ammonium chloride (41%), zinc ammonium chloride (47%), zinc chloride (5%), zinc and zinc oxide (7%) and small amounts of hydrogen chloride. Average fume concentration in the worker's breathing zone was 5.6mg/m3. Highest exposure occured when immersing articles in molten zinc. Highest fume concentrations were in plants with no local exhaust ventilation systems. The most effective systems had an exhaust hood covering the full length of the tank with an airflow of 1.3m3/s/m2. Other factors in exhaust hood design are described. French translation available from INRS, 30 rue Olivier-Noyer, 75680 Paris Cedex 14, France.
Descriptors (primary) harmful substances; exhaust ventilation; metal fumes; galvanizing
Descriptors (secondary) local exhaust; report; Finland; ammonium chloride; zinc; hot-dip metal coating; zinc chloride; ventilation design; exposure evaluation; occupational hygiene evaluation; translation; zinc oxide
Document type E - Books, reports, proceedings
Subject(s) Metal production and metalworking
Broad subject area(s)
Browse category(ies) Surface treatment
Ventilation