In a semiconductor manufacturing operation, isopropyl alcohol is used to clean parts' There are 100

1
In a semiconductor manufacturing operation,
isopropyl alcohol is used to clean parts. There
are 100 workstations and each one uses 1 pint of
isopropyl alcohol per day. What level of dilution
ventilation is needed to keep the air
concentrations below the PEL of 400 ppm? (MW
60.1 g/mole density 0.79 g/cc K 3)
2
Calculate pounds per minute
3
Plug in the formula
4
Time-weighted average

• Find the time-weighted average for the following

PEL for toluene is 376 mg / M3 is TWA above PEL?
(MW 92 g / mole)
5
TWA Solution
6
Decible Addition

• Sum decibel readings of 85 dBA, 87 dBA, 87 dBA,
  90 dBA
• For the sum, what is the exposure time allowed
  under the OSHA PEL?

7
Decibel solution
8
Final Problem Set

• Here is the final problem set. It looks like the
  one I uploaded earlier did not print out
  correctly. Use this one there are only 3
  problems.
• I will put up some more, if I have time.