Subpart J Confined Spaces. 29 CFR 1910.146. Background. OSHA estimates 239,000 general industry establishments employing over 12 million workers have confined spaces More than 4.8 million Permit Required Confined Spaces and millions more non-permit confined spaces
29 CFR 1910.146
NOT DESIGNED FOR
LARGE ENOUGH TO ENTER
AND PERFORM WORK
“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.”
“Limited - when an employee would be forced to enter or exit in a posture that might slow self-rescue or make rescue more difficult.”
Standard Safety Requirements for Confined Spaces (ANSI Z117.1-1995)
“Restricted entry and exit means physical impediment of the body, e.g., use of the hands or a contortion of the body to enter into or exit from the confined space”.
“For example, even if the door or portal of a space is of sufficient size, obstructions could make entry into or exit from the space difficult. The Agency intended that spaces which otherwise meet the definition of confined spaces, and which have obstructed entry or exits even though the portal is a standard size doorway, be classified as confined spaces.”
* Space large enough to enter &;
* Limited or Restricted entry or exit &;
* Not designed for continuous worker
Not a confined Space
Any other recognized
MUST BE PREVENTED
A sign reading:
- DANGER -
PERMIT REQUIRED CONFINED SPACE
“DO NOT ENTER”
or other similar language would satisfy the requirement for a sign.
When there are changes in the use or configuration of a non-permit confined space that might increase the hazards to entrants, the employer shall reevaluate that space and, if necessary, reclassify it as a permit-required confined space.
19.5 % Minimum acceptable oxygen level.
15 - 19% Decreased ability to work strenuously. Impair coordination. Early symptoms.
12-14% Respiration increases. Poor judgment.
10-12% Respiration increases. Lips blue.
8-10% Mental failure. Fainting. Nausea Unconsciousness. Vomiting.
6-8% 8 minutes - fatal, 6 minutes - 50% fatal 4-5 minutes - possible recovery.
4-6% Coma in 40 seconds. Death
(Source: Compressed Gas Association Bulletin SB-2)
Water vapor content varies, but is usually the third largest constituent by volume in air.
- gases that causes suffocation by dilution of oxygen.
NOTE: This procedure produces an
IDLH oxygen-deficient atmosphere
- materials that render the body incapable of utilizing an adequate supply of oxygen.
10 ppm Permissible Exposure Level 8 Hours
50 - 100 Mild Irritation - eyes, throat 1 Hour
200 - 300 Significant Irritation 1 Hour
500 -700 Unconsciousness, Death 1/2 - 1 Hour
>1000 Unconsciousness, Death Minutes
T = 7.5 V/C
T = purge time in minutes
V = the volume of the space in ft3
C = effective blower capacity CFM
Combination Full Facepiece Pressure Demand SAR with Auxiliary Self-Contained Air Supply
Full Facepiece Pressure Demand SCBA
Attendants may NOT perform other duties
that interfere with their primary duty
to monitor and protect!
Entry Supervisors must:
OSHA has specified alternative protection procedures that may be used for permit spaces where the only hazard is atmospheric and ventilation alone will control the hazard.
When a confined space is opened
When a confined space is opened
NOTE: The above certificate must be made available to entrant to review.
If you meet the conditions stated in Section (C)(5)(I) of the OSHA standard, you may use the procedures specified in Section (C)(5)(ii) of the standard.
This allows you to OMIT
Paragraphs (d) through (f)
and (h) through (k) of the standard.
NOTE: Paragraph (g) Training
still applies to all confined
On-site teams must
Off-site teams must