SAFETY ENGINEERING

Q1. The Heat Stress Index (HSI) uses the terms O (Oxygen required), M (Metabolism), R (Radiation) C (Convection), and E (Evaporation). Compare and contrast the terms. Provide an example of a control method that you believe would be effective in controlling heat stress related to each of the terms M, R, C, and E.

Q2. What dimensions would you use for a booth-type hood if you wanted an exhaust rate of 1,000 cubic feet per minute and a capture rate of 100 feet per minute to capture organic vapors from a paint spray operation? Be sure to show your work. If you wanted to clean the air that you are capturing before exhausting it outside, what type of air cleaning device would you recommend and why?

Q3. You are evaluating heat stress in workers digging a ditch by hand to lay sewage pipes. You obtain the following average values over a two hour period: Natural Wet Bulb (NWB) temperature = 27.0° C, Globe Temperature (GT) = 32.0° C, and Dry Bulb (DB) temperature = 30.0° C. Which WBGT index would you use to evaluate heat stress for this operation? Calculate a WBGT value for digging the trench. What control methods would you suggest to reduce the risk of heat illness in these workers?

Q4. Describe the Life Safety Code, and include how it relates to egress and emergency evacuation.

Q5. You have a production area where ten welders are producing small parts using MIG welding on mild steel for eight hours each day. There is a general "haze" visibly present, which increases throughout the work day. What type ventilation system would you recommend for the operation? Which factors associated with the contaminant(s) produced by the welding operation would you consider in choosing the ventilation system? How would you evaluate the effectiveness of any ventilation system you installed?