In a semiconductor manufacturing operation, isopropyl alcohol is used to clean parts. There are 100 workstations and each one uses 1 pint of isopropyl.

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Presentation transcript:

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)

Calculate pounds per minute

Plug in the formula

Time-weighted average Find the time-weighted average for the following: Time8 – 10:3010:30 – 12:00 12 – 3:153:15 – 4:00 Conc100 ppm125 ppm75 ppm50 ppm PEL for toluene is 376 mg / M3; is TWA above PEL? (MW = 92 g / mole)

TWA Solution

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?

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