confined space entry - osha training | oshacademy · pdf fileequipment to be used for confined...
TRANSCRIPT
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Controlling Associated Hazards
Confined Space Entry
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EM 385-1-1 Section 34 29 CFR 1926.21 (b) (6) 29 CFR 1910.146 UFGS 01 35 29 (Latest) ANSI Z 111.7 Accident Abstracts
References
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Why Comply???? Confined space entry is a leading cause
of occupational fatalities in this country
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Statistics
Standard covers 240,000 workplaces and 12.2 million workers
Workers make 4.8 million entries/year
Standard may prevent 85% of fatalities and nearly 11,000 injuries
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Potential Confined Space Hazards
Engulfment Oxygen deficiency (19.5% or
less) Oxygen enrichment (above
21%) Flammable gases
or vapors Combustible dusts Toxic substances IDLH atmospheres Physical hazards
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Boiler, Degreaser, Furnace Pipeline, Pit, Pumping Station Reaction or Process Vessel, Mills Septic Tank, Sewage Digester Silo, Storage Tank, Barges Sewer, Utility Vault, Manhole Trenches, Shafts, Caissons
Typical Confined Spaces
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Typical Confined Spaces
Caisson
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Confined space: a space that
(1) is large enough and so configured that a person can bodily enter and perform assigned work; and
(2) has limited or restricted means for entry or exit and;
(3) is not designed for continuous worker occupancy.
How to Identify Confined Spaces
34.A.03.a
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Openings as small as 18 inches in diameter. Difficult to enter with SCBA or other life-
saving equipment. Difficult to remove downed worker in folded
up or bent over position. Exit from large openings may be difficult due
to presence of ladders, hoists, etc.
Limited Openings for Entry/Exit
Confined Space Characteristics
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Lack of air movement in and out of the space can create an atmosphere much different than the outside atmosphere.
Deadly gases can be trapped inside. Organic materials can decompose. May not be enough oxygen due to
presence of other gases or chemical reactions such as rusting.
Unfavorable Natural Ventilation
Confined Space Characteristics
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Most confined spaces are not designed to enter and work in on a regular basis.
Designed to store a product. Enclose materials or processes. Transport products or substances. Occasional worker entry for inspection,
repair, cleanup, maintenance, etc.
Not Designed for Continuous Worker Occupancy
Confined Space Characteristics
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Non-Permit Required Confined Spaces (NPRCS)
A confined space that does not contain or have the potential to contain an atmospheric hazard capable of causing death or physical harm.
34.A.03.b
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Typical Non-Permit-Required Spaces
Utility closets Below-grade
trenches Storage vaults Utility
subbasements
34.A.03.b
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Permit-RequiredConfined Spaces (PRCS)
A confined space that has one or more of the following: Contains or has potential to
contain a hazardous atmosphere
Contains the potential for engulfment
Internal configuration that can trap or asphyxiate entrant
Any other serious safety or health hazards
34.A.03.c
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Typical Permit-Required Spaces
Chemical storage tanks
Waste or storage pits Grain bins Underground tunnels Railroad cars
under construction
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Confined Space Competent Person (CSCP)
Thorough knowledge of OSHA’s Confined Space Standard, 29 CFR 1910.146
Experience with PRCS space entry procedures
Authority to supervise and influence how work is performed on jobsites and in facilities
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CSCP Responsibilities Identification and labeling Program development PRCS permit development Coordination with local emergency
responders
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Attendant Responsibilities
Knows the hazards that may be faced during entry
Aware of possible behavioral effects of hazard exposure in authorized entrants
Continuously maintains an accurate count of authorized entrants
Remains outside of the PRCS until relieved by another attendant
Communicate with entrants as necessary to monitor status
Monitor activities inside and outside the space to determine if space is safe for entrants to remain.
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Entrant Responsibilities
Know the hazards of the space Use appropriate equipment Communicate with attendant as
necessary Alert the attendant if:
An alarm is activated Detects a prohibited condition
Exit the PRCS ASAP when: Ordered to do so by attendant Recognizes any warning or sign of exposure
to dangerous situation Detects a prohibited condition Alarm is activated
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Rescuer Responsibilities Understand the hazards of the space Be certified in emergency first aid and CPR Understand appropriate entry procedures Know how to use
rescue equipment Practice confined
space rescues at least annually
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Confined Space Program Elements Identification and labeling Confined space hazard identification Safe confined space entry conditions Equipment to be used for confined space entry at the site Procedures for evaluating PRCS conditions when entry is conducted Policies and procedures to ensure at least one attendant is available
outside the PRCS Designate by name, personnel at the site with active roles in confined
space entry. Document procedures and agreements with local emergency
responders. Document a site specific procedure for preparing, issuing, using and
cancelling entry permits Document procedures for concluding entry after operations are
complete Develop procedures for reviewing PRCS entries and documenting
lessons learned Establish a policy to review cancelled permits to modify procedures
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Confined Space
Restricted Access
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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
Oxygen Deficient Atmospheres
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Oxygen level above 21%. Causes flammable and combustible
materials to burn violently when ignited.
Hair, clothing, materials, etc. Oil soaked clothing and materials. Never use pure oxygen to ventilate. Never store or place compressed tanks
in a confined space.
Oxygen Enriched Atmospheres
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2 Critical Factors: Oxygen content in the air. Presence of a flammable gas, or vapor Presence of dust (visibility of 5’ or less)
Proper air/gas mixture can lead to explosion
Typical Ignition Sources: Sparking or electric tool, Welding / Cutting Smoking
Flammable Atmospheres
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Product stored in a confined space: Gases released when cleaning. Materials absorbed into walls of confined
space. Decomposition of materials in the confined
space. Work performed in a confined space: Welding, cutting, brazing, soldering. Painting, scraping, sanding, degreasing. Sealing, bonding, melting.
Areas adjacent to a confined space.
Toxic Atmospheres
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Decomposition of materials. Human waste. Rotten egg odor at low concentrations. Possibly no warning at high
concentrations. PPM Effect Time 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
Hydrogen Sulfide
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Odorless Colorless Gas. Combustion By-Product. Quickly collapse at high concentrations. PPM Effect Time 50 Permissible Exposure Level 8 Hours 200 Slight headache, discomfort 3 Hours 600 Headache, discomfort 1 Hour 1000-2000 Confusion, nausea, headache 2 Hours 1000-2000 Tendency to stagger 1 1/2 Hours 1000-2000 Slight heart palpitation 30 Min. 2000-2500 Unconsciousness 30 Min.
Carbon Monoxide
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Confined Space Competent Person (CSCP) must verify presence of safe work atmosphere.
Test all areas of a confined space. Top, Middle, Bottom
Methane is lighter than air. Carbon Monoxide is the same as air. Hydrogen Sulfide is heavier than air. Oxygen Deficiency.
Testing The Atmosphere
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At a minimum, test the PRCS atmosphere for the following in the order specified: (a) Oxygen; (b) Combustible gases and vapors; and (c) Toxic gases and vapors.
Testing The Atmosphere
34.A.06.e.(2)
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Reasons for Space Ventilation
Maintain oxygen levels at least 19.5% and below 22% by volume.
Maintain toxic gases and vapors at acceptable levels
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Required by UFGS on all entries. To correct problems and maintain safety. Must be aware of hazards you are trying to
correct in the confined space. Air intake in a safe location to draw fresh
air only. Continuous ventilation with minimum air
exchanges. Retest the confined space before entry.
Ventilation
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Types of Personal Protective Equipment
Harnesses Retrieval lines Chemical protective
clothing Welding apron/sleeves Respirators Gloves Safety glasses
PPE necessary in the event that engineering controls and work practices do not adequately protect entrants (does not apply to NPRCS).
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All permits shall be signed by each employee entering the confined space, the CSCP, the attendant and the authorized entry supervisor.
Permit Entry Systems
34.A.06.g
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PRCS Confined Space
All confined spaces shall be identified and labeled. The label shall identify the space as a PRCS or NPRCS.
35.A.05a
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Employee Training- Employees entering confined spaces shall be trained to understand the requirements of the facility/site specific confined space program.
PRCS Training
34.A.07
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All workers involved; entrants, attendants, and rescue team members.
Prior to initial work assignment. Space’ s hazards communicated with each
worker during AHA review session. Retraining: Job duties change. Change in permit-space program. New hazards are present. Job performance indicates deficiencies.
Training and Education
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Trained in use of emergency rescue equipment and PPE.
Shall practice making rescue every 12 months. Trained similar to entrant training
level. Provided access to PRCS Retrieval system available for depth >5ft.
Standby / Rescue
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Retrieval System – more than 5 feet deep
Standby / Rescue
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Retrieval System – more than 5 feet deep
Standby / Rescue
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Provide a competent person for confined space per EM 385-1-1
Develop a confined space a entry plan per EM 385-1-1, 29 CFR 1910, 29 CFR 1915, and 29 CFR 1926, etc.
Identify the qualified person’s name and qualifications, training, and experience.
Procedures for rescue by contractor personnel and coordination with emergency responders.
Post confined space entry permit on bulletin board.
Most Recent UFGS (01 35 26) Confined Space Overview
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Provide permanent signs integral to or securely attached to access covers of new-permit required spaces.
Follow entry procedures per section 34.A.04.b of EM 385-1-1.
Forced air ventilation for all confined space entry.
Sewer wet-wells require continuous atmosphere monitoring with audible alarm.
Most Recent UFGS (01 35 26) Confined Space Overview (cont)
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Is this a Confined Space?
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Are these PRCS Confined Spaces?
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Is this trench a Confined Space?
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Work Performed in Confined and Enclosed Spaces on Ships and Vessels
The following items applies only to ship and vessel repair and maintenance, not regular sip and vessel activities.
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Definitions Adjacent spaces are spaces which border an area on a
vessel or vessel section such as:
Cargo tanks or holds Pump or engine rooms Storage lockers Tanks containing flammable or combustible liquids, gases
or solids Crawl spaces in all directions
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CPCSSV A Competent Person for Confined Spaces in
Ships and Vessels (CPCSSV) is someone who has:
Knowledge of the designation of spaces where work is done
Ability to understand and follow through on the air sampling, PPE, and instructions of Marine Chemist, Coast Guard authorized persons, or CIH
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What are confined spaces on ships and vessels?
Compartment of small size and limited access such as bottom tank, cofferdam, or other space which by its small size and confined nature can readily create or aggravate a hazardous exposure.
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Written confined space procedures are mandatory.
All confined spaces are considered permit-required confined spaces until testing proves it otherwise.
Trained personnel Rescue equipment Notification to the federal fire
department
Summary