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Introduction toConfined Space Safety
OR-OSHA 215
0501
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Trainer NamePosition
Company PhoneEmail
(Revise as needed)
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Objectives
This class provides the following information:
1. Criteria for confined spaces and permit-required confined spaces.
2. Hazards which may exist in permit-required confined spaces.
3. Steps in developing a permit-required confined space program.
4. Training requirements.
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Why a Permit-Required Confined Space Program?
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Does workplace contain PRCS? (b)
Inform Employees. (c)(2)
Will PRCS be entered?
Will Contractors enter?
Will host employees enter?
Does space have known orpotential hazards?
Can hazards be eliminated?
Can space be maintained safeusing continuous forced air only?
Prepare for entry using permit procedures.
Verify acceptable entry conditions.
Issue permit. Maintain acceptableentry conditions throughout entry.
Entry tasks completed. Return andcancel permit.
Audit permit program
Consult other OSHAStandards.
Prevent employee entry. (c)(3)Do task from outside of space.
Inform contractor. (c)(8) Contractor obtains information. (c)(9)
Both contractor and host employees enter.
Coordinate entry operations. (c)(8), (d)(11) Prevent unauthorized entry.
Prevent unauthorized entry.
May reclassify space as non-PRCS. (c)(7)
Space may be entered under (c)(5).
Permit not valid until conditionsmeet permit specifications.
Emergency exists (prohibited condition).Entrants evacuated, entry aborted. Call rescuers if needed. Permit is void. Reevaluate program to correct/preventprohibited condition. No entry until programcorrections completed. May require a new program.
Not a PRCS. Consult other OSHA standards.
No
Yes
No
Yes
Yes
No
Yes No
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Stop1
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1 Spaces may have to be evacuated and re-evaluated if hazards arise during entry.
A quick reference to the Permit-Required Confined Space Standard
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Does workplace contain PRCS? (b)
Inform Employees. (c)(2)
Will PRCS be entered?
Will Contractors enter?
Will host employees enter?
Does space have known orpotential hazards?
Can hazards be eliminated?
Can space be maintained safeusing continuous forced air only?
Prepare for entry using permit procedures.
Verify acceptable entry conditions.
Issue permit. Maintain acceptableentry conditions throughout entry.
Entry tasks completed. Return andcancel permit.
Audit permit program
Consult other OSHAStandards.
Prevent employee entry. (c)(3)Do task from outside of space.
Inform contractor. (c)(8) Contractor obtains information. (c)(9)
Both contractor and host employees enter.
Coordinate entry operations. (c)(8), (d)(11) Prevent unauthorized entry.
Prevent unauthorized entry.
May reclassify space as non-PRCS. (c)(7)
Space may be entered under (c)(5).
Permit not valid until conditionsmeet permit specifications.
Emergency exists (prohibited condition).Entrants evacuated, entry aborted. Call rescuers if needed. Permit is void. Reevaluate program to correct/preventprohibited condition. No entry until programcorrections completed. May require a new program.
Not a PRCS. Consult other OSHA standards.
No
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Stop1
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1 Spaces may have to be evacuated and re-evaluated if hazards arise during entry.
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1. Does the workplace contain a confined space?
Evaluate Your Workplace
1. Large enough for whole body to enter and work, and
2. Limited access or egress, and
3. Not designed for continuous occupancy
Yes! if the space is...
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What is meant by limited or restricted entry and exit?
What is meant by not designed for continuous occupancy?
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2. Does the workplace contain permit-required confined spaces (PRCS)?
1. Contains hazardous atmosphere, or
2. Has potential for engulfment, or
3. Has dangerous configuration, or
4. Contains other serious safety or health hazards.
Yes, if it’s a confined space and it...
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Evaluating Confined Spaces for Hazards
Hazardous Atmospheres
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1. Oxygen Level {too high or too low?}
23.5% and above = High
20.8 - 21% = Normal
19.5% and below = Deficient
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Atmospheric conditions in a confined space can change greatly within a few minutes.
Why would too much oxygen be hazardous?
How could you have too much oxygen?
What are some causes or indications of possibly having a deficient oxygen atmosphere inside a space?
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Suspect O2 Deficient When:
• Space has been closed up, sealed or ventilated before entry.
• Has contained inerted atmosphere or has been purged.
• Contains any amount of water or organic material.
• Metal Oxidation - rusting.
• Combustion processes.
• Displacement by other gases.
• Coatings, sludges, materials with cure and/or absorb oxygen - activated charcoal.
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Dangers of Low Oxygen Levels
16 - 12% O2 in Air Deep breathing, fast heartbeat, poor attention, poor thinking, poor coordination
14 - 10% O2 in Air Faulty judgment, intermittent breathing,rapid fatigue (possibly causing heart damage),very poor coordination, lips turning blue
10% or less O2 in Air Nausea (vomiting), loss of movement, loss of consciousness followed by death
Less than 6% O2 in Air Spasmodic breathing, convulsive movement, death in approx. eight minutes
Coma in 40 seconds4% - 6% O2 in Air
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29 CFR 1926 Subpart P
Air quality tests taken before entry.
Excavations more than 4 ft. deep when hazardous atmosphere exists or could exist.
Tests conducted as necessary, including checks for flammable gases and oxygen deficiency.
Where hazardous atmospheres exist or could be expected to exist, emergency rescue equipment must be on worksite and readily accessible.
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2. Flammable/Explosive Gas, Vapor, Mist
Hazardous if it exceeds 10% of its lower flammable limit (LFL)
Lower Flammable Limit (LFL), or lower explosive limit (LEL), is the lowest concentration of air-fuel mixture at which a gas or vapor can ignite.
Upper Flammable Limit (UFL), or upper explosive limit (UEL), is the highest concentration of air-fuel mixture that can be ignited.
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Flammable Atmospheres
Flammable
Non-flammable (Too “Rich”)
Temperature
VAPOR
Non-flammable (Too “Lean”)
FlammableRegion
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Airborne Combustible Dust
Dust Ignition
Air
Explosive when concentration is between the LEL & UEL!
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3. Toxic Substances
Hazardous if they exceed doses or permissible exposure limits (PEL) published in:
OR-OSHA Division 2 Subdivisions G & Z
Refer to your material safety data sheets for chemical-specific toxicity characteristics, health hazards, reactivity hazards, etc.
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PermissibleExposure Limit (PPM) Substance
Carbon Dioxide 5,000Carbon Monoxide 50 Hydrogen Sulfide 20 Methane 1,000Nitric Oxide 25Oxygen diflouride 0.05Phosgene (carbonyl chloride) 0.1Sulfur Dioxide 5Stoddard Solvent 500
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Engulfment
• Liquid or flowable solids
• Can be aspirated
• Can cause death by:
Plugging respiratory system,Strangulation,Constriction, orCrushing
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Hazardous Configuration
Can trap or asphyxiate
Inwardly converging walls, or
Floor slopes downward, or
Floor tapers to smaller cross-section
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Any Other Recognized Serious Safety or Health Hazard
Electrical equipment
Mechanical equipment
Visibility - lighting
Biohazards
Claustrophobia
Noise
Radiation
Temperature
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Once you have evaluated and identified the permit-required confined spaces at your workplace, inform employees through signs and/or other equally effective means.
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Permit-Required Confined Space Entry
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If permit-required confined spaces will not be entered, you must still take all measures to
prevent entry!
How?
How is PRCS “entry” defined?
When any part of the body breaks the plane of the opening in a permit required confined space.
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Ensure compliance with permit space program
Hazards of the permit space
Precautions and procedures
Coordinate entry operations (if conducted)
Debrief when completed (hazards found or created)
When contractors enter your permit spaces:
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Obtain information about permit space hazards & entry operations
Coordinate entry operations (if conducted)
Brief employer on permit space program being used
Debrief employer on hazards confronted or created
What does this basically involve?
When contractors enter your permit spaces:
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Quick Quiz
(actually a recap)!
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When your Employees enter Permit-Required Confined Spaces
1. Can the hazard(s) which made the space a permit space be eliminated?
If YES The space can be reclassified as a nonpermit-required space.
If NO Prepare for permit entry or consider another question…...
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2. Is the only hazard of the permit space an actual or potential atmospheric hazard?
If NO Entry made under the permit system only. If YES You can follow the alternative (c)(5) procedures!
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Before we discuss (c)(5) procedures:
Control of the atmospheric hazard through forced air ventilation does not constitute elimination of the hazard.
When following these (c)(5) procedures exclusively, the employer is not required to develop a permit entry system, establish an entry team, or provide a rescue system.
Of course, these elements are required when entering permit spaces through the permit system.
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The alternative (c)(5) procedures are allowed when...
Verification is made that using continuous forced air ventilation is safe;
Monitoring and inspection data supports the atmospheric hazard is the only hazard and the forced air ventilation is effective;
Data is documented and made available to entrants.
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Ensure safety before removing a cover and guard opening immediately;
Test internal atmosphere (O,F,T) - observation available to entrant;
Continuous forced air ventilation; Atmosphere periodically tested - observation
available to entrant; Evacuate immediately if necessary and evaluate
what went wrong; Verify these procedures were conducted through
a written certification.
And once the above are met……..
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More on the Alternative (c)(5) Procedures!
No entry until FAV has eliminated any hazardous atmosphere;
Direct FAV to ventilate immediate work area and areas where the entrant will likely be (be aware of pockets within the space);
FAV must continue until all workers have left the space;
FAV must have clean source;
FAV must not increase the hazards in the space.
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Ventilating Confined Spaces
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Ventilation Equipment
• Natural - rarely dependable
• Mechanical -
preferred, positive hazard reduction
depends on configuration
consider nature of atmospherichazard
© Lab Safety Inc., Janesville WI. Used with Permission
© Lab Safety Inc., Janesville WI. Used with Permission
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Remember, ventilation must be continuous during entry!
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Air Monitoring EquipmentUsed during initial investigation prior to, and during
confined space entry.
(Note: You must test in this order)
Tests for:
1. Oxygen content2. Flammable gases and vapors3. Toxic gases and vapors
© Lab Safety Inc., Janesville WI. Used with Permission © Lab Safety Inc., Janesville WI. Used with Permission
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Detector Tubes
Sealed glass tubesCrystals react with airborne chemicalsReaction results in color changeSpecific for the substance of concernCan be inaccurate +/- 25%False readings from other chemicals
Gas Detection Instruments
Sensors measure concentrationsResults in a meter or digital reading; alarmsPortable multi-gas instrumentsAccurateMay react to interfering chemicals
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Sampling
Hydrogen Sulfide(heavier than air)
Carbon Monoxide(same as air)
Methane(lighter than air)
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The Entry Permit System
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What is the written plan?
The measures implement to prevent unauthorized entry
The identification & evaluation of all permit space hazards prior to entry
The development & implementation of safe entry operations
Providing and maintaining all necessary equipment (PPE, monitors, etc.)
Evaluating permit space conditions before & during entry operations
Providing at least one attendant & developing procedures for multiple spaces
Designating and training all persons who have active roles
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What is the written plan?
Developing and implementing rescue & emergency procedures
Developing and implementing the entry permit procedures (issue, use, cancel)
Coordinating multi-employer entry procedures Developing procedures for concluding the entry
(closing off the space) The review & evaluation of entry operations
during the year (as needed) The annual permit space program review using
the historic permits
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The entry permit must document:
1. Permit space to be entered;
2. Purpose of the entry;
3. Date & duration of the entry permit;
4. Authorized entrants; 5. Attendants;
6. Entry supervisor and place for signature;
7. Hazards of the permit space; 8. Isolation measures - hazard controls (purging,
ventilating, etc.);
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The entry permit must document:
9. The acceptable entry conditions;
10. Test results (initial/periodic) with initials/name of tester & time;
11. Rescue/emergency services available and means to summon;
12. Communication procedures between entrant and attendant;
13. All necessary equipment (PPE, Testing/Communication equipment, etc.);
14. Other necessary information;
15. Any additional permits (hot work, etc.).
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Duties to the Entry Team
The Entry Supervisor
The Attendant
The entrant
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Identify Equipment For:
Testing and monitoring
Ventilating
Personal protection (PPE)
Communication
Lighting
Barriers and shields
Entry and exit
Rescue and emergency © Lab Safety Inc., Janesville WI. Used with Permission
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Rescue and Emergency procedures
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Three options to permit-required confined space rescue
1. Arrange for rescue service from an outside source.
2. Arrange for your own employees to provide rescue.
3. Provide for non-entry rescue.
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Training
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When?
• Initially• When change in assigned duties• When change in permit space operations• Inadequacies in the employee’s performance
Who?
Training must establish worker proficiency and include new or revised procedures to ensure compliance with permit space standards.
Be sure to include demonstration!
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The content of the training must include:
Nature of hazards
Actions to take when exposed to hazards
Use of rescue and emergency equipment
Verify the appropriate training was completed through a written certification.
The certification must contain each employee’s name, the signature(s) of the trainers, and the date(s) of the training.
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Appendices
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Before you run, time to review!