Confined space Entry safety Guideline.ppt

Confined space PPT

1. CONFINED
SPACE
ENTRY

2. What is a Confined Space?
•Is large enough and so configured that an
employee can enter bodily and perform work;
•Has limited or restricted means of entry or exit;
•Is not designed for continuous human occupancy.
•Unfavorable Natural Ventilation
A space that:

3. Examples of Confined Spaces:
• Tanks
• Manholes
• Boilers
• Furnaces
• Sewers
• Silos
• Hoppers
• Vaults
• Pipes
• Trenches
• Tunnels
• Ducts
• Bins
• Pits

4. Examples of Confined Spaces:
TANK
SILO PIPELINE

5. Categorising Work Space
* Space large enough to enter &;
* Limited or Restricted entry or exit &;
* Not designed for continuous worker
occupancy.
NO
Not a confined Space
YES
Confined Space
Hazardous Atmosphere
Engulfment Hazard
Configuration Hazard
Any other recognized
serious hazard
Permit
Required
Confined
Space
Non
Permit
Required
Confined
Space
YES NO
Or
Or
Or

6. Typical Reasons for Confined
Space Entry:
 Inspection of physical integrity and process equipment.
 Maintenance such as abrasive blasting and application of
surface coatings.
 Tapping, coating, wrapping and testing of underground
sewage, petroleum, steam and water piping system.
 Installing, inspecting, repairing and replacing valves,
piping, pumps, motors, etc. in below ground pits and
vaults.
Cont...Cont...

7. Typical Reasons for Confined
Space Entry:
Cleaning to remove sludge and other waste materials.
Repair, including welding and adjustments to
mechanical equipment.
Adjusting and aligning mechanical devices and
components.
Checking and reading meters, gauges , dials, charts
and other indicators.
Installing,splicing, repairing and inspecting electric
and telephone cables.
Rescue of workers who are injured or overcome inside
the space.

8. Potential Hazards in Confined
Spaces
• Oxygen Deficiency
<19.5% or >23.5%
oxygen
concentration
• Combustibles
- Methane
- Hydrogen
- Acetylene
- Propane
- Gasoline fumes
• Toxic Materials
- Carbon Monoxide
- Hydrogen Sulfide
- Welding fumes
- Corrosives
• Electricity
• Heat Stress
• Mechanical Hazards
- Mixers Crushers

9. Oxygen Deficient Atmospheres
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

10. Oxygen Enriched Atmospheres
•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.

11. Flammable Atmospheres
•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 operations.
- Smoking

12. Toxic Atmospheres
•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:

13. Temperature Extremes
•Extremely hot or cold temperatures.
•Steam cleaning of confined spaces.
•Humidity factors.
•Extremely cold liquids.
•Work processes inside the confined space
can increase temperature extremes.
•Personal protective equipment.

14. Other Hazards
•Noise
•Amplified due to acoustics within the
space.
•Damaged hearing, affect communication.
•Slick / Wet Surfaces
•Slips and falls.
•Increased chance of electric shock.
•Falling Objects
•Topside openings expose workers inside
confined space to falling objects.

15. ENTRY
• The act by which a
person intentionally
passes through an
opening into a permit
required confined space.
•Any part of the body
passing through the
opening is considered
entry.

16. IDLH
• IMMEDIATELY DANGEROUS TO LIFE OR HEALTH
• Any condition which poses an immediate threat
to the health of life on an entrant, or;
• Would cause irreversible adverse health effects,
or;
• Would interfere with an individual’s ability to
escape unaided from a permit space.

17. ENTRANT
•The employee who
will physically enter
the confined space
to perform the work.

18. ATTENDANT
•The employee who remains outside the
confined space and monitors the
entrant(s); guards the space against
unauthorized entry; warns the entrants of
any unusual conditions; and summons
the rescue personnel if needed.

19. Permit-Required Confined
Space
•A Permit-Required
Confined Space is
confined space that
has one or more of
the following
characteristics:
•Contains or has the potential to
contain a hazardous
atmosphere;
•Contains a material that has the
potential for engulfing an
entrant;
•Has an internal configuration
such that an entrant could
become trapped or asphyxiated;
or
•Contains any other serious
safety or health hazard.

20. Should include:
Specific permit space identification
Purpose and date of entry
Duration of authorisation
Authorised entrants by name
Name of authorised attendant and entry supervisor
Actual hazards of the identified space
Control and isolation methods to be used
Acceptable entry conditions
Permit SystemPermit System
Cont...Cont...

21. Should include:
Results of initial and periodic atmospheric testing
Rescue and emergency services to be summoned
Communication procedures authorised between
attendant and entrants
Equipment to be provided
Other information as necessary
Other permits, such as hotwork.
Permit SystemPermit System

22. Entry
Supervisor
•The employee responsible
for coordinating the entry
into the confined space.
This must be a team
leader or foreman.

23. Responsible Person
•The person directly responsible
for the work being performed in
the confined space. This can be
the RCM, Site Engineer, SSO or
other person qualified by
training and experience.

24. Non-Permit
Confined Space
•A confined space that does not
contain or, with respect to
atmospheric hazards, have the
potential to contain any hazard
capable of causing death of
serious physical harm.

25. Two Options for Entering
Confined Spaces:
•Permit-required Permit-required
confined space confined space
entryentry
–For hazardous For hazardous
or potentially or potentially
hazardous hazardous
confined space confined space
workwork
•Non-permit Non-permit
confined confined
space entryspace entry
–For non-For non-
hazardous hazardous
confined confined
space workspace work

26. Permit-Required Confined
Space Entry Procedure
•Isolate the space
•Ventilate the space
•Conduct Toolbox Talks
•Complete permit
•Test the atmosphere
•Enter the space

27. Isolate the Space
from all hazards
•Close Valves
–Double block & bleed, or
–Blank flange
•Empty the Space
–Depressurize, vent & drain
•Lockout/Tagout Equipment
–Electrical sources
–Rotating/reciprocating parts
–Hazardous materials
•Clean residue from the space

28. Ventilate the Space
•Use mechanical ventilation
–Fans
–Air horns
•Ventilate at the rate of at least four (4)
volumes per hour
–Larger spaces require more ventilation
•Make sure air supply is not contaminated
–Ventilation air supply must be from fresh air
uncontaminated with flammables, toxins, etc.

29. Conduct a Tool Box Talks
•Entire crew must attend
–Attendants, entrants, entry supervisor
•Review hazards of entry and work
•Review PPE
•Review procedure for contacting rescue
–verify rescue available
•Complete permit

30. Complete Entry Permit Form
•Permit must be correctly and completely
filled out prior to entry.
•Permit must be activated by Entry
Supervisor’s signature to be valid.
•No entry is allowed without a valid permit.
•Permits are valid for up to 8 hours.
•When work is completed, permit form
should be returned to safety.
•Cancelled permits must be kept on file

31. Test the Atmosphere
•Check for Oxygen Content:
–At least 19.5% and less than 23.5%
•Check for Combustibles:
–Less than 10% of the LEL
•Check for Toxic Gasses:
–Most commonly carbon monoxide (PEL <35 ppm)
–or any other hazardous materials as determined
by the use of the space.
In this order:

32. NOTICE:
•Any time a limit is exceeded, no matter
what the reason, all personnel shall
immediately exit the space, and no
others shall enter until atmospheric
conditions are returned to safe levels.
THERE ARE NO EXCEPTIONS TO THIS!THERE ARE NO EXCEPTIONS TO THIS!

33. Atmosphere Testing Shall Be
Performed:
•Prior to every entry when the space is vacant;
•After a 10 minute ventilation period (if
ventilation is necessary);
•At least hourly for permit-required confined
spaces.
•More frequently, if conditions or suspicions
warrant.

34. Always test theAlways test the
air at various levels air at various levels
to be sure that theto be sure that the
entire space is safe.entire space is safe.
Good AirGood Air
Poor AirPoor Air
Deadly AirDeadly Air
Good air near Good air near
the opening the opening
does NOT mean does NOT mean
there is good air there is good air
at the bottom!at the bottom!

35. Enter the Space and Proceed
with work:
•An attendant shall be posted near the entrance
for the duration of the work. He shall be in
constant communication with the entrants
while the job is in progress.

36. When the Job is Done:
•Remove all personnel, tools, and debris from
the space.
•Close the space.
•Cancel the permit.
•Review the job with the host employer
(hazards, problems, other employers, etc.)

37. Non-Permit Confined Space Entry
•Isolate the space
•Ventilate the space
•Evaluate the space
- Test atmosphere
- Assure justification conditions are met
•Conduct tool box talks
•Enter the space

38. Isolate the Space
from all hazards
•Close Valves
- Double block & bleed, or
- Blank flange
•Empty the Space
- Depressurize, vent & drain
•Lockout/Tagout Equipment
- Electrical sources
- Rotating/reciprocating parts
- Hazardous materials
•Clean residue from the space

39. •Use mechanical ventilation
–Fans
–Air horns
•Ventilate at the rate of at least four (4)
volumes per hour
–Larger spaces require more ventilation
•Make sure air supply is not contaminated
–Ventilation air supply must be from fresh air
uncontaminated with flammables, toxins, etc.
Ventilate the Space

40. Evaluate the Space
•Determine that the space meets all the conditions set forth in the
non-permit justifications
•Conduct atmospheric testing
•Evaluation must be certified by SSO’ s sign.
•Determine that the confined space does not:
- contain or have the potential to contain a hazardous atmosphere
• Continuous mechanical ventilation not acceptable as good
atmosphere
- contain a material with the potential for engulfment
- Has an internal configuration which could trap or asphyxiate,
or
- contain any recognized serious safety or health hazard

41. Enter the Space and Proceed
with work:
•If non-permit conditions change during the
job, the space shall be immediately
evacuated, and re-classified as a permit-
required confined space; or conditions
shall be returned to non-permit conditions
and again certified as such by the SSO.

42. Contractor Confined Space
Entry
•Contractors must be informed of the hazards within
the space.
•Contractors must supply their own attendants
–One attendant is acceptable for multiple
companies’ entrants
•Contractors must supply their own air monitors
•Contractors must review entry after completion of
job

43. Attendant Responsibilities
•To monitor entrants during the job and during
entry & exit to help insure their safety.
–The attendant may not abandon his post for any
reason while personnel are in the space unless
relieved by another qualified attendant.
•To monitor atmospheric conditions in the
space prior to and during entry.
•To control access to the confined space.
•To summon emergency assistance as needed.
•To assess hazards in and around the space,
and take action on the same.
•To keep records of confined space work, such
as air test results, personnel entry/exit, etc.

44. Entrant Responsibilities
•To assure that the space has been adequately
ventilated, isolated, emptied, or otherwise made
safe for entry.
•To immediately exit a space, without question, upon
word of the attendant, no matter what the reason.
•To follow all safety rules and procedures that apply
to the job.
•To be familiar with the work to be performed and the
procedures that apply to the job.
•To use the appropriate PPE whenever necessary.

45. Supervisor Responsibilities
•To assure adequate protection is provided to
the entrants by verifying adequate
lockout/tagout and that all hazards are
securely isolated.
•To support the attendant’s authority in
controlling access to a confined space.
•To verify that all personnel have exited prior
to closing the space.
•To assure that all personnel involved are
aware of the hazards associated with the
space.
•To assure that rescue services are available
prior to entry.

46. Hydrogen Sulfide
•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 - 100Mild Irritation - eyes, throat 1 Hour
200 - 300Significant Irritation 1 Hour
500 -700Unconsciousness, Death 1/2 - 1 Hour
>1000Unconsciousness, Death Minutes

47. Carbon MonoxideCarbon Monoxide
•Odorless, Colorless Gas.Odorless, Colorless Gas.
•Combustion By-Product.Combustion By-Product.
•Quickly collapse at high concentrations.Quickly collapse at high concentrations.
PPMPPM EffectEffect TimeTime
5050 Permissible Exposure LevelPermissible Exposure Level8 Hours8 Hours
200200Slight headache, discomfortSlight headache, discomfort3 Hours3 Hours
600600Headache, discomfortHeadache, discomfort 1 Hour1 Hour
1000-20001000-2000Confusion, nausea, headacheConfusion, nausea, headache2 Hours2 Hours
1000-20001000-2000Tendency to staggerTendency to stagger 1 1/2 1 1/2
HoursHours
1000-20001000-2000Slight heart palpitationSlight heart palpitation30 Min.30 Min.
2000-25002000-2500UnconsciousnessUnconsciousness 30 Min.30 Min.