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Spring 2011   
Airline Seating

On The Audit Trail: 

How Big is a Confined Space?

Barbara Jo Ruble, QEP, CPEA, President, Baltimore, MD

During the course of a recent audit, I discovered that many of my colleagues and I had been taught to apply OSHA's confined space standard (29 CFR 1910.146) incorrectly. The question that came up was related to identifying "what is a confined space", which I find to be one of the more frequently debated questions among safety professionals. And because this discussion took us beyond the basic standard and into the Compliance Directive and the preamble to the standard, I thought it would be worthwhile to share the details with others who may face similar situations.

The confusion comes up (at least for me) in reading the definitions in the standards. A confined space is defined as one that (among other things) "is large enough and so configured that an employee can bodily enter". This is followed by the definition of "entry", which says in part that entry "is considered to have occurred as soon as any part of the entrant's body breaks the plane of an opening into the space". This has led safety professionals to the interpretation that any space into which a worker might extend his/her head or arms should be considered a confined space (if the space also met the rest of the definition - not being designed for continuous occupancy and having limited or restricted means of entry/exit) even if the space is too small to accommodate the employee's entire body.

Further investigation, however, shows that OSHA never intended to apply the confined space standard in this way, and the proof is clearly laid out in the preamble to the 1993 final rule (available online at http://osha.gov/pls/oshaweb/owadisp.show_document?p_table=PREAMBLES&p_id=840). The preamble notes that several commenters on the original proposed rule said that the definitions of "confined space" and "entry" were confusing (obviously they were right) and some commenters suggested that small spaces could be just as hazardous and should be subject to the rule. OSHA responded to these comments as follows:
 
"The Agency has not adopted this suggestion. While OSHA is concerned that spaces that are too small for complete bodily entry may pose hazards for employees, the Agency did not intend to cover such spaces under the permit space standard. OSHA believes that the NPRM preamble discussion of permit space incidents and of proposed provisions clearly indicates that the proposed rule was intended to cover only spaces that were large enough for the entire body of an employee to enter. As commenters have correctly noted, the proposed definition of "permit required confined space" did not cover the "small" spaces. Such spaces do not meet the definition of "confined space", nor do they pose hazards comparable to those associated with confined spaces. Since an employee cannot totally enter such spaces, he or she should not have difficulty withdrawing from the space. In order for a space to be considered a permit-required confined space, it must first be a confined space. A space that cannot be entered is not confined; therefore, it does not pose hazards related to the difficulty of exiting the space."

More recent agency interpretations are consistent with this position. The 2008 Letter of Interpretation on "Determining whether an aircraft fuel tank is considered a confined space" (www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=27085
) makes clear that if an employee cannot fit their entire body into the space, then it is not a confined space.

Now of course there are spaces into which some employees may fit, while others do not. I would recommend that if a very small adult (think 4ft. 11 in. and 90 lbs.) will fit into the space, the space should be managed as a confined space. It is also important to recognize that it is the capacity and configuration of the space, not the actual entry practices that determine whether a space is subject to the rule. So, if an employee will fit inside the space and it meets the other elements of the confined space definition, it must be managed as a confined space even if written procedures call for employees only to reach inside with their hands.

Finally, you must keep in mind that there are other sections of the OSHA rules that require you protect employees from the types of hazards that may be encountered when working in spaces that are too small to be considered confined spaces. These may include exposures to toxic substances and air contaminants, machine guarding issues, or control of hazardous energy. The Compliance Directive for the confined space standard (CPL 02-00-100) (found online at http://osha.gov/pls/oshaweb/owadisp.show_document?p_table=DIRECTIVES&p_id=1582) has a question and answer section in Appendix E that includes the following.

6. How will OSHA address a space that does not satisfy the criteria for a confined space but that potentially contains a hazardous atmosphere?

Employers must comply with the permissible exposure limits and other requirements contained in standards addressing specific toxic substances and air contaminants, to the extent applicable, in all spaces in which employees may be present. In addition, the respiratory protection standard, 29 CFR 1910.134, applies where an employee must enter a space in which a hazardous atmosphere may be present and no other specific standard applies. The respiratory protection standard contains special precautions for working in atmospheres that are oxygen deficient or immediately dangerous to life or health.

I hope this information will help clarify what has been a confusing standard and assist you in easing the burden of confined space management for your clients.


Barbara Jo Ruble, QEP, CPEA is the President of Specialty Technical Consultants. She has more than 30 years of experience helping corporations to develop, assess, and improve their EHS management systems and compliance programs. She is s the primary author of OHSAS 18001/OSHA-VPP Occupational Health & Safety Management Systems: A Complete Implementation Guide, published by Specialty Technical Publishers of Vancouver, Canada. Barb may be reached at [email protected] or by phone at 410-625-1952.

Questions about this Article?

Melanie Powers-Schanbacher

Telephone: 908.707.4001