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Exposure to solvents in the metal fabrication and engineering industry

Exposure to solvents in the metal fabrication and engineering industry

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Exposure to solvents in the metal fabrication and engineering industry

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  1. Exposure to solvents in the metal fabricationand engineering industry 2nd European Conference on AWARE and other coding systems, Gent, October 4 & 5, 2007 Henri Heussen, PhD, & Hester Dekker, MSc

  2. Background • Web based tool metal sector: coating & degreasing • Aim: exposure to solvents self risk assessment by SME’s and larger companies Tool: two validated routes • Good Practices (Risk Management Measures = RMM) • Model: Occupational Air Requirement (OAR) or Required Air Quantity (RAQ) This part: validation of good practices and applied ventilation model Next part IVAM: using the same exposure data > validation of AWARE ventilation model

  3. Activities studied Good Practices • Degreasing by dipping – (semi) closed system • Mixing paint – closed mixer • Cleaning spray guns – closed washing machine with LEV Model • Brushing/rolling • Spraying

  4. Model: calculation OAR Legenda: OAR: Occupational Air Requirement (m3/l) Vi: Volume solvent/liter paint (ml/l) i: index including all solvents in the paint ρi: specific gravity (g/ml) fi: evaporation factor (default 1) OELi: Occupational Exposure Limit solvent (mg/m3) or hardener & thinner or hardener & thinner

  5. Calulation needed ventilation QOAR: Ventilation needed according to OAR (m3/hr) OAR: Occupational Air Requirement (m3/l) Ve:Amount used (l) T: Time (hr)

  6. Calculation Exposure Index (EI) Legenda: EImodel: Exposure index QOAR: Needed ventilation (m3/hr) Qd: Actual ventilation (m3/hr)

  7. Results - Good Practice mixing paint:closed mixer 10 comp. 32 meas. EI RMM

  8. Conclusions Good Practices: • Predefined Good Practices are indeed good (statistically validated) • Also other Good Practices found (some statistically validated) • Detailed description of Good Practice is necessary and a prerequisite for correct use of the tool

  9. Results brushing/rolling(excluding natural ventilation) 7 companies 20 measurem. EI model EI measurements

  10. Results spraying(excluding natural ventilation) 6 companies 14 measurem. EI model EI measurements

  11. Conclusions model • Very good correlation between model and measurement data • However, model does not always overestimate • Therefore for brushing/rolling a safety factor is needed! • For spraying not a priori necessary > political decision • To be calculated on the basis of sensitivity/specificity

  12. Conclusions model (continued) • After adding safey factor(s) model = validated exposure assessment tool • Erring to the side of caution: • separation between local and general ventilation • MSDS upper limit range (volume solvent/l) • more than one sprayer in the same room > total amount of solvents used by all sprayers attributed to one sprayer • Covers a wide range: • in amount of paint used per time • room volume • type of ventilation • ventilation capacity • measured exposure index

  13. Thanks for your attention!This study:- performed by order of the social partners (FME-CWM, Metaalunie, FNV, CNV, De Unie)- supported by the Ministry of SZW (VASt programme)