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Industrial Hygiene HSC 359: Exam 2 Study Guide

by: Helpful

Industrial Hygiene HSC 359: Exam 2 Study Guide HSC 359

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Gas & Vapor, General Methods of Control and Ventilation.
Industrial Hygiene
Study Guide
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This 4 page Study Guide was uploaded by Helpful on Sunday May 1, 2016. The Study Guide belongs to HSC 359 at Illinois State University taught by in Spring 2016. Since its upload, it has received 16 views. For similar materials see Industrial Hygiene in Nursing and Health Sciences at Illinois State University.


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Date Created: 05/01/16
Study Guide for HSC 359 Second Exam 1. How accurate must a sampling method be to meet OSHA requirements?    ±25 2. Why is integrated sampling necessary?   ­ Concentrations vary during a shift 3. Be able to calculate concentrations of gases & vapors  4. The IH has a responsibility to choose controls that are cost effective & compatible  with THE EMPLOYEE & THE PROCESS 5. What are two of the most important functions & critical competencies for an  IH?   ­ Problem characterization ­ Risk Assessment 6. What are three concerns when implementing a process change?   ­ The effect on productivity ­ Effect on quality ­ Creation of new hazard 7. What is the 1  step you must perform before you decide to control an air­borne  problem? (HINT: There are 3 elements that must be assessed to determine the  need for control.)   ­ Source ­ Air Path ­ Receiver 8. Once you determine the need for a control procedure, list 4 factors to consider in choosing the method of control.   ­ The nature of the hazard (gas, liquid, biological) ­ How it affects the worker ­ Worker characteristics ­ Regulations require the use of a control 9. List the 3 types of controls & give an example of each   ­ Engineering (substitution, isolation, ventilation) ­ Administrative (education, work practice) ­ PPE (respirators, eye protection, hearing protection, gloves) 10. Identify the first type of control to consider & explain why it is first. ­ Engineering o Potential of eliminating the hazard & limited training 11. Identify at least two ways to control a hazard using isolation:   ­ Isolate the hazard (enclosure) ­ Isolate the worker (in a booth) ­ Separate the worker & the hazard in time 12. Explain why Personal Protective Equipment (PPE) is the “control of last resort”  ­ Does not remove the hazard ­ Used only when engineering & administrative controls do not work ­ Requires inspection, maintenance, cleaning & record keeping 13. Volumetric flow rate (Q) is determined using what two factors?   ­ V = Velocity (fpm) ­ A = Area (ft ) 14. Define static pressure (SP)  ­ Pressure in the duct that tends to burst or collapse the duct ­ It can be positive & negative pressure 15. Define velocity pressure (VP) & explain the relationship between VP & velocity  (V) ­ The pressure required to accelerate the air from velocity 0 to velocity “X” ­ Can only be POSITIVE pressure 16. Define total pressure (TP)  ­ The sum of SP& VP 17. Identify & discuss 2 major sources of energy losses  ­ Hood loss ­ Duct loss o Friction losses (pipe smoothness, diameter) o Fitting losses (elbows, entries) 18. Define the following terms  Capture velocity: The minimum velocity to capture at distance “X” from the hood opening.  Face velocity: Velocity at hood opening  Slot velocity: Velocity through openings in a slot hood  Duct velocity: Velocity through a cross­section of duct.  19. List the 3 factors that determine the effectiveness of a hood.  ­ Hood shape ­ Extent the hood encloses the source ­ Quantity of air flowing into the hood 20. List 2 general types of hoods & describe them ­ Enclosing Hood (fume hood) o Completely or partially encloses the process o Designs range from complete enclosure to one side only  ­ Exterior Hood (capture hood) o Located adjacent to source without enclosing it o Contaminant is released outside the hood ­ Receiving Hood o Subcategory of an exterior hood 21. Describe what is meant by the minimum duct velocity & why it should not be too high or too low  ­ For transport of particulate contaminants, a minimum velocity is necessary to  prevent settling or plugging of the duct ­ Excessively high velocity is wasteful and may cause abrasion of the inside of the  duct. 22. What are 5 conditions when we could use dilution ventilation? ­ More cost­effective options are not available ­ Gases, vapors, or small aerosols with low toxicity ­ Emissions occur uniformly in time & space ­ Emissions are not near breathing zone ­ Supply air is clean 23. What is a mixing factor & how do we use it? ­ It is used to account for incomplete or poor mixing in the space 24. Understand the use of ventilation measuring devices & give examples of 3 different  ways to evaluate ventilation systems  ­ Make pressure measurements o Inclined manometer & pilot tube traverse o U tube manometer for static pressure ­ Air velocity instruments (velometer or thermal anemometer) ­ Make air directional measurements (smoke tube or tracer gas) 25. What do the terms commissioning and air balance mean?  Commissioning: The contractor has demonstrated to the owner that all requirements have been met. The owner can now be assured that the HVAC system will function safely &  effectively Air Balance: Assuring that the supply & exhaust flow rates match design specifications. ­ Balance by design (meets requirements) ­ Balance using dampers 26. What are 3 ways we used in the lab to evaluate a ventilation system? 27. Explain how an inclined manometer may be used to measure velocity  28. List the 4 factors to consider when selecting a ventilation instrument ­ Work plan objectives ­ Experience in the past ­ Range of air flows expected ­ Other factors (probability & ruggedness, size of the probe relative to the sampling location)


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