Procedures For Atmospheric Testing In Confined Spaces
Atmospheric testing is required for two distinct purposes: evaluation of the hazards of the permit space and verification that acceptable conditions exist for entry into that space.
Types of Testing
1. Evaluation Testing
The atmosphere of a confined space should be analyzed using equipment of sufficient sensitivity and specifically to identify and evaluate any hazardous atmospheres that may exist or arise, so that appropriate permit entry procedures can be developed and acceptable entry conditions stipulated for that space. Evaluation and interpretation of these data and development of the entry procedure should be done by, or reviewed by, a technically qualified professional (e.g. OSHA consultation service, or certified industrial hygienist, registered safety engineer, certified safety professional) based on evaluation of all serious hazards.
2. Verification Testing
The atmosphere of a permit space which may contain a hazardous atmosphere should be tested for residues of all contaminants identified by evaluation testing using permit specified equipment to determine that residual concentrations at the time of testing and entry are within the range of acceptable entry conditions. Testing order should be oxygen, flammables, and then toxics. Results of testing (i.e. actual concentration) should be recorded on the permit in the space provided adjacent tot the stipulated acceptable entry condition.
3. Duration of Testing
Measurement of values of reach atmospheric parameter should be made for at least the minimum response time of the test instrument specified by the manufacturer.
4. Testing Stratified Atmospheres
When monitoring for entries involving a descent into atmospheres which may be stratified, the atmospheric envelope should be tested at a distance of approximately four feet (1.22 meters) in the direction of travel and to each side. If a sampling probe is used, the entrants’ rate of progress should be slowed to accommodate the sampling speed and detector response.
5. Periodically Retest
Retesting verifies that the atmosphere remains within acceptable entry conditions.
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Notes
1. Title 29 Code of Federal Regulations 1910.146, Appendix B.
2. 29 CFR 1910.146 (c)(5)(ii)(C) and (d)(5)(iii)
3. 29 CFR 1910.146 (c)(5)(ii)(F) and (d)(5)(ii)
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