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50983
DOW CHEMICAL U.S.A.
TEXAS DIVISION FREEPORT. TEXAS 77541
ENVIRONMENTAL HEALTH REPORT
EVALUATION OF ASBESTOS EXPOSURE TO INSULATORS AT GLYCOL "A"
file no. A18-23 nirc November 21. 1973 author R.L. Silverthosne-
CHECKED
Summary
Contractor insulator exposure to asbestos fibers were evaluated during the removal of insulation on two columns at Glycol "A". The timeweighted average (the average exposure of asbestos fibers to employees during an eight hour work day) and peak exposures to asbestos fibers are within acceptable levels, although the peak exposures could approach maximum allowable concentrations due to the variability in the asbestos handling procedures. The employees should continue to wear respiratory protection during the handling of asbestos, and every effort should be made to wet down the asbestos insulation before and during removal.
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File No. A18-237
-2-
INTRODUCTION
Environmental Health Services was asked to evaluate the exposure of Insulators to asbestos fibers during the removal of asbestos insulation from two reaction towers at Glycol "A".
METHODOLOGY
Breathing zone and general area air samples were collected on 47 mm-diameter(.8 micron pore size) membrane filters at a sample rate of about 2.0 LPM. The air pumps used were M.S.A. permissible portable personnel pumps. The fibers on the filters were counted by the standard phase-contrast microscopy technique at 450 magnifi cation by the Texas Division Microscopy Laboratory.
DISCUSSION
Table A shows the insulator exposures to asbestos fibers based on an eight hour work day when insulation is being removed from reaction towers. His time weighted average and peak exposure are within acceptable levels based on the present OSHA standard.
Table B shows the results of the sample analyses for the various Insulator operations. The highest asbestos fiber concentration, up to 1.29 fibers/ml, were found during the actual removal of insulation by the employee. Because of the variability in the asbestos handling procedures the employee peak exposures could exceed the allowable ceiling concentration;
CONCLUSION
1. The employees time weighted average and peak exposures to asbestos fibers are within acceptable levels.
RECOMMENDATION
1. Ashestos insulation should be stored in plastic bags, tagged and sealed for disposal.
2. Employees who work regularly with asbestos should have clean work clothes daily. (Work clothes should not be taken home for laundering).
File No. A18-237
-3-
RECOMMENDATIONS (continued)
3. Continue the work practice of wearing respiratory protection whenever asbestos is handled.
4. Employees with significant exposure should shower at the end of the work day.
5. Water should be used to wet down the insulation before and during the dismantling operation. This will reduce the possibility of asbestos fibers becoming air borne.
6. Environmental measurements should be made annually to determine the adequacy of precautions taken.
7. The contractor employer should be familiar with Subpart G, section 1910.93a, of the Federal Register.
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THE DOW CHEMICAL COMPANY TEXAS DIVISION
CENTRAL LABORATORY FREEPORT
DESCRIPTION OATS or SAMPLI
REPORT OF ANALYSIS Atr Filters (Insulators *1.8)
10-2-73
LM
OATS THIS HCPOMT.
10-17-73
1308-00020
Particles and fibers were counted on eight air filters from areas which involved the use and handling of asbestos. Individual counts were made for particles greater than 2. 5 microns, fibers 5 microns to 10 microns, and fibers greater
than 10 microns. The numbers reported are as total number of counts per filter square.
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