0. Corporate Health and Safety ArcelorMittal
Confined Spaces training
March 4th , 2011

1. Summary 1) Introduction 2) Definitions 3) Responsibilities
3.1) Permit Issuer
3.2) Permit Receiver
3.3) Responsible Officer
3.4) Managers and Supervisors
3.5) Safety Departments
3.6) Contractors
3.7) Authorised Entrant
3.8) Standby Person
4) Confined Space Entry Process
4.1) Additional for Man – Baskets
5) Confined Space Procedures
6) Atmosphere Conditions in and around Confined Spaces
6.1) Oxygen DEFICIENT Atmospheres
6.2) Oxygen ENRICHED Atmospheres
6.3) Flammable Atmospheres
6.3.1) Definitions
6.4) Toxic Atmospheres
6.5) Mostly common Gases in Confined Spaces
6.6) Lower Explosive Limit vs. Upper Explosive Limit
7) Atmosphere testing before entering
7.1) Testing instruments
8) Preparing for Entering a Confined Space
8.1) Ventilation
8.1.1 Ventilation forms
8.2) Isolation of Space
8.3) Standby Person
8.4) Rescue and Emergency
8.4.1) What are some emergency response precautions?
9) Personal Protection Equipments (PPE)
9.1) Maintenance of PPE
10) Is worker training important?
11) Potential Hazards Overview

2. 1. Introduction
Working in confined spaces presents a variety of hazards and increased risk of injury to those in the immediate area.
The Occupational ArcelorMittal Health & Safety Regulation, establishes specific requirements for safe entry into confined spaces.
This guideline details controls to be adopted for entry to or work in or around a confined space.
This document is based on specific legislative requirements as contained ArcelorMittal Standard for Confined Spaces

3. Build up of asphyxiate or toxic gas
1.1 REX
Build up of asphyxiate or toxic gas
Sept 08 and Jan 10
CO – Gas Fatality
Lazaro Cardenas Jan 2010 Fatality
Victim went to take an oil sample in the oil deposit of the hydraulic system of the Bischoff in Blast Furnace area. Apparently the cause of death was due to a non noticed gas presence (CO) in the area of the seal of the piston No.1. The victim decided not to use a breathing mask with air line and went alone without gases detector.
Saldhana Sept 2008 Fatality
As the flange was lifted from its position using a crane, a large quantity of CO rich gas escaped as a result of an unexpected opening of one of the isolating valves. This caused a sudden build-up of CO-gas in the immediate environment. The deceased and his colleagues at that point in time were positioned on the 5 meter level, next to the flange. Due to the amount of gas escaping in the vicinity of the 3 employees, the CO monitors used went into the alarm mode. The deceased together with his colleagues attempted to evacuate, but due to the intake of CO gas at the compressor, they inhaled CO via their independent air-line supply.

4. Build up of asphyxiate or toxic gas
1.1 REX
Build up of asphyxiate or toxic gas
April 08 and June 09
Nitrogen – Gas First Aid / Methane – Gas Fatality
Nitrogen
Vanderbijlpark April 2008 First aid
A colleague noticed that the victim was losing consciousness after he had instructed him to insert the last bolt of the keeper plate for the limiting stopper. He himself also started to feel dizzy. Another colleague saw what was happening and grabbed the victim on his arm and removed him from the area. He immediately suspected that there was gas in the area even though their gas monitors had not given an alarm. He suspected that it could be nitrogen exposure. He had the nitrogen supply to the gearbox checked : it was noticed the nitrogen valve was still open.
Methane
Tenteskaya June 2009 Fatality
The concentration of methane in the face was % and 0.45% in the return air; the conditions of the face was satisfactory. The concentration of methane in return air increased up to 0.7%. The operator of air and gas control informed the shift manager of this increase. Then there was a sharp increase of methane concentration. The stand-by auxiliary fan switched on automatically and its shutoff took place straight away.

5. Explosive mixtures or zones of explosive atmospheres
1.1 REX
Explosive mixtures or zones of explosive atmospheres
October 10
Fatality
Vinton October 2010 Fatality
On Monday October 18, 2010 at about 2:30 a.m. the victim, an equipment operator with 4 years of seniority in this department, was helping the crew in startup preparations (it is routine to stop production at 11 pm Friday and start up Sunday night shift for the coming week operations, on 5 day working schedule). It is believed that he started lighting up of the tempering furnace.
At this time, the assumption is that the victim had started the lighting process and during this process, the explosion occurred.
Before this incident, gas was not detected (by smell) by the crew nor the supervisor of the shift. Immediately following the sound of the explosion, the work crew (operators and supervisor) initiated the emergency procedure, which included workforce count.
The victim was found on the floor unconscious, adjacent to the furnace, with refractory material and furnace roof metal plates around him, suffering from a severe head-face trauma.

6. Engulfment in confined space by collapsing material
1.1 REX
Engulfment in confined space by collapsing material
December 10
Fatality
Termitau December 2010 Fatality
A team consisting of 3 men was removing a hanging charge (cleaning of bunker). The victim was in a danger zone of possible charge coal collapse at the bottom of the bunker at the height of 3m and was staying on a metal ladder installed in the bunker (height of ladder – 12 m), he wore a harness and the too long lanyard he used was attached (fastened) to the harness.
Two supervisors were on the upper platform of the bunker, they should ensure the safety of the victim. They fastened the lanyard to the top step of ladder .
Since the safety lanyard attached to the harness of the victim was too long, when charge coke collapse happened (charge fell down from the bunker walls), the coke hit the victim who fell down on the bottom of the bunker and was covered with batch mixture (sanded-in), as a result he suffered fatal injury (asphyxia of respiratory tract).

7. Atmospheres not having safe level of oxygen,
1.1 REX
Atmospheres not having safe level of oxygen,
in particular due to presence of CO, CO2, Ar, N2
December 09
Fatality
Newcastle December Multiple Fatalities
Three persons entered the vessel via the cat ladder with gas monitors on their person. On reaching a particular level the persons collapsed onto the platform. The gas monitors were seen to give an alarm by the operator on top of the furnace, and the persons collapsed almost simultaneously. Owing to the fact that one person’s leg was caught in the cat ladder, the platform could not be raised to evacuate the persons. A further two persons entered the vessel via the cat ladder in an attempt to rescue the persons on the platform; they too collapsed and fell beneath the platform.
The cause was an oxygen deficiency due to apparent ingress of argon through the bottom stirring system due to an inadequate isolation of bottom stirring gas

8. Atmospheres not having safe level of oxygen,
1.1 REX
Atmospheres not having safe level of oxygen,
in particular due to presence of CO, CO2, Ar, N2
February 11
Fatality
Gent February 2011 Fatality
In the evening the flexible hoses of the bottom stirring were reconnected, but the Nitrogen and Argon circuits were still under isolation, both protected with a block and bleed system.
The operator took property of the isolation to guarantee that Nitrogen and Argon remained locked out. Later he started the work in the BOF together with his colleague to remove the scaffold. The work has been started without wearing a multi-gas meter as up till now in the investigation, they were not found yet.
When trying to remove the first part of the work platform, The operator fell unconscious, while his colleague was out of the BOF. The first idea was not linked to gas risk and his colleague called in an AMG maintenance worker for help. With the elevator cage, he went down ( +/- 12 m) in the BOF, felt immediately the lack of oxygen and fell also unconscious. Local AMG workers linked now the accident with gas, and threw a compressed air hose in the BOF. The emergency services which had been called, came to the spot and evacuated both victims out of the BOF. They were able to reanimate the second victim. The reanimation attempts on the first worker however failed

9. 2. Definitions
Confined space is any enclosed or partially enclosed space or spaces where movement is limited or physically restricted and that :
has limited or restricted means of entry or exit (sometimes needing a mechanical system) and
is large enough for a person to enter to perform tasks and
is not designed or configured for continuous occupancy or work and
may have at any time an atmosphere with potentially harmful contaminants, an unsafe level of oxygen, stored substances that may cause engulfment or where there is a risk of death or serious injury from hazardous substances or dangerous conditions and
present special hazards to workers, including risks of toxic or asphyxiant gas accumulation, fires, falls, flooding, and entrapment may be classified as permit-required confined spaces depending on the nature and severity of the hazard.
It is not possible to provide a comprehensive exhaustive list of confined spaces. Some places may become confined spaces when work is carried out, or during their construction, fabrication or subsequent modification.

10. Confined spaces can be below or above ground.
Confined spaces can be found in almost any workplace.
A confined space, despite its name, is not necessarily small.
Confined spaces include, but are not limited to:
Storage tanks, silos or areas of storage, vats, hoppers, utility vaults, tanks, sewers, pipes, access shafts, truck or rail tank cars, aircraft wings, process vessels, boilers, pressure vessels, tank-like compartments that have only a manhole for entry, ceiling and floor spaces, spaces occupied by pipes and cables (considering galleries in particular). Ditches and trenches may also be a confined space when access or egress is limited
Open-topped spaces such as pits, or grease traps, or excavations more than 1.5 meters deep.
Pipes, pumps, sewers, shafts, ducts, drains, tunnels, cellars, spaces under equipments/installations, basements and similar structures.
BOF (Basic Oxygen Furnace) vessel, EAF (Electric Arc Furnace) vessel etc … since entry / exit is not easy and / or gas may be present
There must be a process where a written permit (one time task) or a written procedure (repetitive or continuous jobs) is used to plan and control the work involved in isolating, purging and making the area safe for maintenance and other activities. All isolations made to render the work safe must be physical isolations and follow the ArcelorMittal Isolation Standard (AM Safety ST 001).

11. .

12. Categorizing Work Space
Space large enough to enter and
Limited or Restricted entry or exit and
Not designed for continuous worker
occupancy. NO
Not a confined Space
Permit
Required
Confined
Space
Non
Confined Space
Hazardous Atmosphere
Engulfment Hazard
Configuration Hazard
Any other recognized
serious hazard
YES Or
In addition, it contains one or more of the following

13. Permit-required confined space
"Permit-required confined space (permit space)" means a confined space where one or more of following hazards are present;
The potential to contain a hazardous atmosphere (AM ST 012)
Not have a safe level of oxygen ( e.g. following a nitrogen purge)
The potential for engulfing the entrant
A configuration that might cause an entrant to be trapped or asphyxiated by inwardly converging walls or by a floor that slopes downward and tappers to a smaller cross section
Contains any other recognized serious safety or health hazards that can’t be eliminated and the confined space can’t be maintained in a condition safe to enter.
In those cases the entry points must clearly indicate that a permit is required prior to entry.
Non Permit-required confined space
“Non-permit confined space” means a confined space that doesn’t contain or, with respect to atmospheric hazards, doesn’t have the potential to contain any hazard capable of causing death or serious physical harm

14. 3. Responsibilities 3.1 Permit Issuer
Ensure that hazards associated with the confined space have been:
Identified
Assessed
Appropriate controls adopted.
Inform Permit Receiver:
The locations of the spaces and the potential hazards associated with the respective spaces
The requirement that only authorised, trained personnel may enter the spaces using the procedures outlined in these guidelines.
Ensure completion of entry permit is issued.
Ensure that all personnel involved in the work are properly trained to perform the required tasks.

15. 3.2 Permit Receiver
Adhere to the Entry Permit requirements.
Ensure the job is performed in a safe manner.
Inform Entrants and Standby Persons of the locations of the spaces, the potential hazards associated with the respective spaces, and the requirement that only authorised, trained personnel may enter the spaces using the procedures outlined in these guidelines.
Be aware of the hazards that could exist and have the necessary controls in place.
Satisfy themselves that they understand the requirements of the permit.
Be skilled, qualified trained and competent to perform this work.
Ensure that appropriate control measures are followed (e.g.: placement of locks and tags according to lock-out/tag-out procedures, ventilation if necessary).
Communicate entry permit requirements to any authorised entrant working in the space.
Make equipment and area safe performing above tasks.

16. 3.3 Responsible officer
Ensure that contractors engaged by ArcelorMittal are aware of any occupational health and safety hazards that may exist in the area in which they are working.
Ensure that contractors work safely and complete the work as specified in permits and other associated documents.
Ensure that prior entering a confined or a permit space, a risk assessment has been conducted.
Ensure that before an employee enters a permit space, the internal atmosphere has been tested with a calibrated direct-reading instrument in the following order:
Oxygen content (oxygen-deficient or oxygen-enriched atmospheres)
Flammable gases and vapors
Potential toxic air contaminants

17. 3.4 Managers and Supervisors
Supervisors must understand the work for which a permit has been sought and understand isolation and Lockout / Tagout ArcelorMittal procedures,
Ensure adequate protection is provided to the entrants by verifying adequate Lockout / Tagout and that all hazards are securely isolated.
Ensure that all personnel involved are aware of the hazards associated with the space.
Ensure that a permit is granted before work starts.
Ensure that the person(s) doing the work are appropriately qualified to do the work.
Ensure that all checks are undertaken to ensure that the permit was used correctly.
Ensure that rescue services informed and available as possible prior to entering.
Ensure appropriate persons are informed when a job is completed or suspended and that the permit is cancelled.

18. 3.5 Safety Departments
Provide technical guidance on the application of these guidelines.
Evaluate and update the permit to work guidelines at the review period or as procedures change.
Provide safety expertise and regulatory guidance to Permit Issuer.
3.6 Contractor
Comply with the requirements as detailed in these guidelines.
Ensure entry to a confined space is carried out under a work permit and in accordance with ArcelorMittal Safety Standard Confined Space.
Provide evidence of confined space training to permit issuer, authorised entrants, standby persons and supervisors.
Shall not enter a confined space without a granted ArcelorMittal confined space permit.
Prepare safe work procedures and/or risk assessments for confined space work prior to entering.

19. 3.7 Authorised Entrant
Assessed as competent to enter a confined space
Understand the potential entry hazards and be aware of signs and symptoms of hazardous environment exposure.
Ensure that appropriate control measures are followed (e.g.: placement of locks and tags according to lock-out/tag-out procedures, ventilation if necessary).
Ensure that there exist defined criteria to determinate if periodic re-testing is necessary depending on operations and conditions in and around the permit space.
Maintain communication with the Standby Person at all times.
Evacuate the space immediately upon an emergency, a gas detector alarm occurs or notification by the Standby Person.
Alert the Standby Person and exit the space immediately whenever:
a warning sign or symptom of exposure to a dangerous situation is recognized
a prohibited condition is identified
an evacuation alarm is activated.
Follow the requirements as stipulated on the confined space entry permit

20. 3.8 Standby Person
Remain outside the Confined Space at all times or until relieved by another Standby Person. Activities that may interfere with these duties are prohibited.
Observe the work conditions in the confined space
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 is in the space unless relieved by another qualified attendant.
Control if entrants properly use/worn their PPE
Monitor continuously atmospheric conditions in the space prior to and during work (if needed).
Control if the ventilation system is running well (if needed)
Control access to the confined space.
Assess hazards in and around the space, and take measures if needed.
Keep records related to the confined space work, such as air test results, personnel entry/exit, etc…
Maintain continuous communication with the Authorised Entrants so as to be aware of any problems, which may occur.
Initiate emergency procedures, including rescue procedures, if necessary.
Stop the job & evacuate the people if any non conformity (internal or external) is detected

21. 4. Confined Space Entry Process
Prior to entry of a confined space Own personnel or Contractor personnel are required to:
Realise a new/own HIRA and compare it with the existent one.
Complete a confined space entry permit (in accordance with ArcelorMittal Standard if needed)
Obtain a ArcelorMittal permit for confined space entry (if needed)
Verify that all personnel involved in confined space entry are aware and understand their responsibilities
Verify that personnel are trained in accordance with requirements of confined spaces
Provide the necessary safety equipment, supplies and monitoring equipment to their personnel. Key items include atmospheric monitoring devices, barricades to isolate work area, communication devices for the entrant and stand-by persons and adequate lighting.
Wear all PPE’s, safety harnesses‘ and other devices requested by the approved risk assessment.

22. 4.1 Permit system
The permitting process must include the following elements:
A Risk Analysis, including the need for a competent person to assess such risks as oxygen or contaminants levels, temperature extremes, and concentrations of flammable substances
Isolation procedures for contaminants and other energy sources
Need for ventilation, the requirement for breathing apparatus
The sign-in and sign-out of all persons entering the confined space; internal lighting and signalling
Emergency lights, auxiliary lights
Atmospheric protection conditions;
Display of the permit
Communication equipment
Safety specification of equipment to be taken into the confined space
Barricading (isolated the work area)
Rescue plan and equipment
Standby person
All the work procedures.
Modification possibilities:
If a new hazard is recognized or introduced during the course of work, then the permit must be modified and revalidated
The Risk Analysis may require that people working in confined spaces wear a safety harness, connected with a cable or cord extending outside the confined space, allowing easy evacuation in case of emergency

23. 5. Confined Space Procedures
The internal site procedure must refer to the Law and
the ArcelorMittal Standard ST 002 and ST 012
An identification register of all existing Confined Spaces and Restricted Areas on site
A risk assessment must be performed prior to any work occurring in the confined space.
Different confined space entry permits are required for entry into a space, depending on the type of work being conducted such as cold or hot work.
Isolation of all potentially Hazardous Services prior to entry into the confined space hazardous services that are normally connected to the confined space must be isolated or otherwise controlled.
Air monitoring must be performed prior to entry into the confined space If work stops for a period of more than 1 hour and the confined space has not been occupied for this period a new gas test will be required.
Prior to entry, the confined space must be cleared of all contaminants (purging)
An emergency plan should be documented and communicated to all persons working in or around the confined space
Any person required to issue/receive permits or work in or around a confined space must be appropriately trained and assessed as competent prior to undertaking these activities.

24. 6. Atmosphere Conditions in and around Confined Spaces
The below pictures shows different ranges of Oxygen in the Air.
To work in safe conditions in the confined space the oxygen level must be between (19,5 – 22,5) %
Oxygen deficient atmosphere starts from < 19,5 %
Oxygen enriched atmosphere starts from > 22,5 %
In both cases entry into confined spaces is prohibited
Difficult breathing, death in minutes %
Faulty judgement, rapid, fatigue %
Impaired judgement and breathing %
Maximum for Safe Entry %
Minimum for Safe Entry %
Oxygen enriched, extreme fire hazard > 22.5 %

25. 6.1 Oxygen DEFICIENT Atmospheres
19.5 % Minimum acceptable oxygen level.
% Decreased ability to work strenuously.
Impair coordination. Early symptoms.
% Respiration increases. Poor judgment.
% 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 Deficiency Can Be Caused by CONSUMPTION
“Hot work” (welding)
Breathing
Chemical reactions (ex. Oxidation of chemicals or metal)
Biological action (ex. Decomposing organic matter)

26. 6.1 Oxygen DEFICIENT Atmospheres
Oxygen Deficiency Can Be Caused by DISPLACEMENT
Not having a safe level of oxygen, in particular due to presence of:
Argon (Ar)
Nitrogen (N2) (e.g. following nitrogen purge).
Helium (He)
Carbon monoxide (Co)
Carbon Dioxide (Co2)
Bacterial actions (fermentation process)
Formation of rust on the surface of the confined space (iron oxide/ corrosion)
Consumption of air by the amount of people working in a confined space
Cleaning agents, adhesives, or
Other chemicals

27. 6.2 Oxygen ENRICHED Atmospheres
Oxygen level above 22.5%.
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.
Leak of oxygen
Cellar
Liege Feb 2008 Fatality
The two victims went out to the cellar to carry out a simple work. Suddenly, the atmosphere was kindled and the fire took the two people. One died directly, the other died at hospital. The origin of the accident was a very high concentration of oxygen due to a leak in an oxygen pipe that was buried outside the building.

28. 6.3 Flammable Atmospheres
2 Critical Factors:
Oxygen content in the air.
Presence of a flammable gas, or vapor
Presence of dust (visibility of 5 inches/ 12 cm or less)
Proper air/gas mixture can lead to explosion
Typical ignition Sources:
Sparking or electric tool.
Welding / cutting operations.
Smoking

29. 6.3.1 Definitions TLV-STEL and TVL-TWA
The threshold limit value (TLV) of a chemical substance is a level to which it is believed a worker can be exposed day after day for a working lifetime without adverse health effects.
The TLV for chemical substances is defined as a concentration in air, typically for inhalation or skin exposure. Its units are in parts per million (ppm) for gases and in milligrams per cubic meter (mg/m³) for particulates such as dust, smoke and mist.
Threshold limit value – Short-term exposure limit (TLV-STEL) : spot exposure for a given substance in the air of the workplace, to which the worker may be exposed for a short time (duration of 15 minutes, that cannot be repeated more than 4 times per day)
Threshold limit value –Time weight average (TLV-TWA) : indicates the average concentration in air of workstations in a given pollutant that, given the current state of knowledge, does not endanger the health of the vast majority of healthy workers exposed to them, and this for a duration of 42 hours per week, a rate of 8 hours per day, for long periods. The pollutant in question may be in the form of gas, vapor or dust
The TLV-TWA must always be respected

30. 6.4 Toxic Atmospheres Stored Products Source:
Gases released when cleaning. (e.g.: purging by Argon (Ar))
Materials absorbed into walls of confined space.
Decomposition of materials in the confined space.
Source by work performed:
Welding, cutting, brazing, soldering.
Painting, stripping, scraping, sanding, degreasing.
Sealing, bonding, melting.
Areas adjacent to a confined space: venting or entering into space

31. 6.5 Mostly common Gases in Confined Spaces and Gas Hazard Atmospheres
6.5.1 Carbon Monoxide (CO)
Colorless chemical asphxiant / odorless gas / flammable gas / Deadly!
Quickly collapse at high concentrations
Slightly lighter than air
Primary source:
incomplete combustion of organic material
Gasoline-fueled combustion engines ….
Signs/Symptoms:
Confusion. Dizziness. Headache. Nausea.
Unconsciousness. Weakness.
Possible human effects if you are trapped in Carbon Monoxide atmosphere with this different high exposure levels
PPM Effect Time
35 Permissible Exposure Level 8 hours
200 Slight headache, discomfort hours
400 Headache and nausea hours
800 Headache, dizziness, nausea 45 min.
Headache, dizziness, nausea 20 min.
Headache and dizziness min.
Headache and dizziness min.

32. 6.5.2 Hydrogen Sulfide (H2S)
Colorless / Very strong asphyxiant with rotten egg odor / flammable gas / Deadly!
Odor threshold: ppm
Heavier than air
possibly no warning at high concentrations
Primary source:
incomplete combustion by-product of the decomposition of organic matter / 4 times …
Signs/Symptoms:
Strong odor BUT Fatigues your senses .
Very high concentrations lead to cardio respiratory arrest because of brainstem toxicity.
Affect nervous system
Possible human effects if you are trapped in Hydrogen Sulfide atmosphere with this different high exposure levels
PPM Effect Time
Permissible Exposure Level 8 hours
Mild Irritation - eyes, throat 1 hour
Desensitizes olfactory nerve min.
Unconsciousness, death hrs.
Unconsciousness, death min.
> Unconsciousness, death minutes

33. 6.5.3 Methane (CH4) Colorless/odorless flammable gas, or scented
Natural gas, swamp gas.
Primary source:
Due to gas leak or organic decay
LEL = 5%; UEL = 15%

34. 6.5.4 Argon (Ar)
Colorless / odorless, non-flammable gas and tasteless mixture, it is the most abundant of the noble gases on Earth and the one most used in industry
Heavier than air.
Primary source:
Purging of confined spaces
Firefighting in electrical or computer rooms
BOF (Basic Oxygen Furnace) vessel,
EAF (Electric Arc Furnace) vessel
The main health hazard associated with releases of this gas mixture is asphyxiation by displacement of oxygen

35. 6.6 Lower Explosive Limit vs. Upper Explosive Limit
Definitions:
Lowest concentration (percentage) of a gas or vapour in air capable of producing a flash of fire in presence of an ignition source ( arc, flame, heat).
Concentrations lower than Lower Explosive Limit (LEL) [ Lower Flammable Limit (LFL)] are 'too lean' to burn.
Concentrations lower than Upper Explosive Limit (UEL) [ Upper Flammable Limit (UFL)] are 'too rich' to burn.
Important to point out where 10% LEL is in relation to LEL.
UEL
LEL
Too lean
Flammable
Region
Flash Point
Temperature
Concentration in Air
Too rich
10% LEL

36. It’s always a good idea to keep the
Why is 10% used?
The combustible gas detection instrument measures % LEL, not Actual % gas in air. Depending on calibration gas used, some gases will give a much lower LEL reading than the actual LEL concentration.
Their is a very small percentage difference at 10%. For this reason, 10% LEL should be used as the max LEL concentration for worker entry.
It’s always a good idea to keep the
fire and/or explosion
triangle in mind.
Air
100%
Methane 0%
Too Rich
5.3%
LFL
15.0%
UFL
Boom!
Too Lean
Methane example

37. 6.6 Lower Explosive Limit vs. Upper Explosive Limit
Before a person enters a confined space, it shall be ensured;
the concentration of flammable contaminant in the atmosphere is below 5 % of its LEL
Entry shall not occur to a confined space when flammable contaminants are greater than or equal to 5% LEL
Where a concentration of flammable contaminant is found to be more than 5% and less than 10% of its LEL, all persons must leave the confined space unless a continuous monitoring, suitably calibrated flammable contaminant detector is used in the confined space at all times while persons are present in it.
Where a concentration of flammable contaminant in the atmosphere of a confined space is found to be 10% of its LEL or more, all persons must leave the confined space.

38. 7. Atmosphere testing before entering
Air monitoring is required to be performed prior to entry into the confined space to ensure that the atmosphere is safe prior to entry.
If work stops for a period of more than 1 hour and the confined space has not been occupied for this period a new gas test will be required.
After ventilation period (if ventilation is necessary);
Initial testing should be carried out by a “Competent person” who will issue a certificate stating whether the space is ‘safe for man’ and/or work, and if any special conditions are to be observed.
In no case should the operator / worker is considered to be a “Competent Person” – even if he is equipped with his own personal testing equipment.
Ventilation should be stopped about 10 minutes before tests are made and not restarted until the tests are completed.

39. 7. Atmosphere testing before entering
The testing should be carried out in the following sequence
Oxygen-deficient or -enriched atmospheres
Flammable atmospheres
Toxic atmospheres when considered necessary
To evaluate the measurements taken, the following limit values should be used.
Continuously monitoring is required for the whole work period

40. Always test the air at VARIOUS levels to be sure that the entire workspace is safe
Good Air
Poor Air
Deadly Air
Top of vessel
Bottom of vessel
Middle of vessel
Good air near the
opening does
NOT mean there
is good air at the
bottom !
This constellation is NOT all the time given (see example next page)

41. See some examples of Specific Gravity ( kg/m3) of Gases.

42. 7.1. Testing instruments Examples of single gas detector(s):
The examples shown in the next slides are just 2 of many other existing atmosphere testing devices on the market.
Fill free to make your own choice !
Examples of single gas detector(s):
Warns Against Hazardous Gas Concentrations
The device reliably warns against hazardous concentrations of the following: carbon monoxide (CO), hydrogen sulphide (H2S), oxygen (O2), carbon dioxide (CO2), sulphur dioxide (SO2), chlorine (Cl2), hydrogen cyanide (HCN), ammonia (NH3), nitrogen dioxide (NO2), nitrogen monoxide (NO), phosphine (PH3) and organic vapours.

43. Examples of single gas detector(s):
Warns Against Hazardous Gas Concentrations
The device reliably warns against hazardous concentrations of the following: Carbon Monoxide (CO), Oxygen (O2) .

44. Examples of single gas detector(s):
Warns Against Hazardous Gas Concentrations
These Hands Free Single Gas Monitor can detect Carbon Monoxide (CO), Hydrogen Sulphide (H2S), or Oxygen (O2) gases.

45. Examples of multi gas detector:
Warns Against Hazardous Gas Concentrations
The device reliably warns against hazardous concentrations of the following by changing the sensors:
Ammonia (NH3), Arsine (ASH3), Carbon Monoxide (CO), Chlorine (Cl2), Hydrogen Cyanide (HCN), Hydrogen Sulphide (H2S), Phosphine (PH3), and Sulphur Dioxide (SO2).
Special Accessories for this detector
Its unique extender cable allows the sensor to be attached to the end of a 10 foot (+/- 3 m) cable for remote monitoring and quick response.

46. Examples of 4 gas detectors:
Warns Against Hazardous Gas Concentrations
The 1 to 4 gas detector reliably detects combustible gases and vapours as well as O2, CO and H2S.
The very compact design - no larger than a mobile phone - and low weight make the device the ideal companion in your daily work.
Special Accessories for this detector
An external pump, which can be operated with a hose of a length of up to 20 m, is the perfect solution for remote measurement applications as of tanks, shafts, etc.
Attention : By using external pumps to extract the gas from tanks it takes a several time to measure the correct gases.

47. Examples of 4 gas detectors:
Four Gas Confined Space Monitor
The 1 to 4 gas detector reliably detects simultaneous detection of 4 gases, LEL, O2, H2S & CO
The very compact design - no larger than a mobile phone - and low weight make the device the ideal companion in your daily work.
Special Accessories for this detector
An external pump, which can be operated with a hose of a length of up to 20 m, is the perfect solution for remote measurement applications as of tanks, shafts, etc.

48. 8. Preparing for Entering a Confined Space
Example of controlling a Confined Space (1)
Before entering in Confined Space, it is mandatory, to control this space with a gas detector.
If the cave is too deep, wide,…, a special devices, as an adapted stick, rod, is to use to control the atmosphere .

49. Example of controlling a Confined Space (2)
How using the adapted stick:
Use a adapted stick, fixe the 4 gas detector on it, hold it at mini. 20 seconds into the confined space, take it of, read the result and repeat the test in the 4 directions (up, down, left or right and depth)

50. 8. Preparing for Entering a Confined Space
8.1 Ventilation
Before a person enters a confined space, it shall be ensured;
the atmospheric contaminants in the confined space are reduced to below the relevant exposure standards
If concentrations of materials are found to be at harmful levels, the confined space must be ventilated to remove them before entry.
Ventilation should be continuous where possible because in many confined spaces the hazardous atmosphere will form again when the flow of air is stopped. All openings are to be opened for ventilation including emergency exit.
De-ballasting a tank does not guarantee a safe atmosphere. Testing of the atmosphere is still required.
The inert gas fans should not be used to provide fresh air ventilation because contaminants from the inert gas lines could be introduced into the tanks.

51. 8.1.1 Ventilation forms Use mechanical ventilation Fans Air horns
Make sure air supply is not contaminated
Ventilation air supply must be from fresh air uncontaminated with flammables, toxins, etc.
Localized exhaust ventilation is better suited to capture fumes (welding), dust, and chemical contaminants
Ventilation must be continuous when there is an existing or potential atmospheric hazard.

52. Possible Blowers & Fans problems:
Effective ?
Blowers & fans provide mechanical dilution ventilation. Be sure the blower is appropriately sized, explosion-proof, and its intake is placed far enough away from any source of contamination –
like an exhaust pipe on a vehicle!
Effective ?
A space under positive pressure will eventually expel the contaminant through an opening, but the time it takes is the real question.

53. Possible Respiratory Protection problems
Respirators must be worn in oxygen deficient atmospheres or when toxins are capable of causing death, incapacitation, impairment of ability to self-rescue, injury, or acute illness due to their health effects.
A supplied air respirator is required for oxygen deficiency or toxic chemical levels that are Immediately Dangerous to Life or Health (IDLH). An air-purifying respirator (respirators that filter contaminated air) cannot be used in these atmospheres.
Employees must have complete training on the proper use of respirators.

54. 8.2 Isolation of Confined Space
The supervisor should evaluate the need and the way how for isolation of the confined space from service before entering the space.
A way to isolate the Space from all Hazards
Close Valves
In order of priority :
Physically remove the connection to the space
Blind flange (assure it can withstand the pressure and is in good state)
Double block & bleed as a last resort if the other two are not possible and only upon approval of hierarchy
Cut off any connection which could enable gas penetration. To close valves or other armatures is not safe enough, disconnect the supplies.
Disconnection is always required, in case an explosive atmosphere could not be excluded.
wrong
right

55. 8.2 Isolation of the possible energies in a Confined Space
Empty the Confined Space
Depressurize, vent & drain,…
Lockout / Tagout Equipment
Electrical sources
Rotating/reciprocating parts
Hazardous materials …
Clean residue from the space ( e.g.: Argon purging)

56. 8.2 Isolation of the possible energies in a Confined Space
Gaseous fire suppression is a term to describe the use of inert gases and chemical agents to extinguish a fire. Also called Clean Agent Fire Suppression .
Lockout / Tagout must be realised in case of working in a server or electrical room extinguished by an inert gas ( e.g.: Argon , CO2,..)
Numerous incidents have occurred where individuals in these Confined Spaces have been killed by carbon dioxide or Argon agent release.
To prevent such occurrences, additional life safety systems are typically installed with a warning alarm that precedes the agent release. The warning, usually an audible and visible alert, advises the immediate evacuation of the enclosed space.
Accidents have also occurred during maintenance of these systems, so proper safety precautions must be taken beforehand
Remember, purging a space with an inert gas expels a flammable but leaves no oxygen.

57. 8.3 Standby Person
A standby person should be assigned to remain on the outside of the confined space and be in constant contact (visual or two-way voice communication e.g. walkie-talkie) with the survey team inside. Routines for communication intervals with the survey team should be established.
The standby person:
should not have any other duties than to serve as standby and know who should be notified in case of emergency;
should never leave his post even after help has arrived and is a key communication link to others onboard;
should be able to communicate sufficiently in a relevant common language.
Communication between watch personnel (Bridge, Cargo Control Room or Engine Control Room) and standby person should be established

58. 8.4 Rescue and Emergency Note:
Rescuers must be trained in and follow established emergency procedures and use appropriate equipment and techniques (such as lifelines, respiratory protection, standby persons).
Emergency and evacuation procedures should be agreed and understood by all parties involved in a potential rescue operation.
Steps for safe rescue should be included in all confined space entry procedures. Rescue should be well planned and evidence should be made available that indicates drills have been frequently conducted on emergency procedures
Note:
Unplanned rescue, such as when someone instinctively rushes in to help a downed co-worker, can easily result in a double fatality or even multiple fatalities if there is more than one would-be rescuer.
Over 50% of the workers in confined spaces die while attempting to rescue other workers.
An unplanned rescue could be the last!

59. 8.4.1 What are some emergency response precautions?
If a situation arises where there is a hazardous condition and the worker does not leave or is unable to leave the confined space, rescue procedures should be begin immediately.
The Safety Watch is qualified in confined spaces rescue procedures and will be available immediately outside the confined space to provide emergency assistance if needed. The Safety Watch should be familiar with the structural design of the confined space. The Safety Watch is in constant communication with the worker inside the confined space and will:
Have an alarm for calling for help.
Have all required rescue equipment (for example, safety harnesses, lifting equipment, a lifeline) immediately available and be trained in its use.
Hold a basic first aid certificate.
Can do Cardiopulmonary Resuscitation (CPR).

60. 8.4.1 What are some emergency response precautions?
The detailed plan for emergency response to an injury or other emergency within the confined space should be described in detail in the Confined Space Hazard Assessment and Control Program.
Rescue the victims from outside of the confined space, if possible. No other worker should enter a confined space to attempt a rescue unless that worker is fully trained in the rescue procedures and is wearing the appropriate personal protective equipment. More than 60% of deaths in confined spaces are would-be rescuers, who are not fully trained and adequately equipped.
Another worker qualified in confined spaces rescue procedures must be present outside the confined space before the first rescuer enters the confined space. Do not use the same air as the confined space workers you are rescuing. Wear SCBA (self contained breathing apparatus) or supplied air respirator with an escape bottle.

61. 9. Personal Protection Equipment (PPE)
PPE is traditionally regarded as the last line of protection with the emphasis being placed on avoidance and appropriate managerial control methods. However, the potentially hazardous nature and isolated position of those entering a confined space means that, for the surveyor, PPE may be the first line of protection.
Each confined space will present different hazards and degrees of risk to health and safety, the final provision of PPE should therefore be based on an assessment of risk.
As a general rule the following guidance is offered:
Basic surveyor PPE should include:
Body protection (hard wearing overalls with suitable pockets for notebook, etc);
Foot protection (steel toecaps (200 joules), steel midsoles, good grip, oil resistant);
Head protection (hard hat with chinstraps);
Hand protection (hard wearing gloves);
Eye protection (protective glasses, goggles);
Ear protection (ear defenders or ear plugs – worn subject to communication system);
Gas meter - multi-gas meter for measuring of HC, H2S, CO, O2 is recommended;
Lighting (hand held with lanyard and appropriate beam width).

62. 9.1 Maintenance of PPE
Clean Respirators by disassembling / washing in warm water and mild detergent.
Store mask and cartridges in ziplock bags.
Use a locker to store respirators and cartridges.

63. 10. Is worker training important?
Yes, appropriate training is extremely important to working safely in confined spaces. Hands-on training should be an essential part of the confined space training.
Every worker that enters a confined space must be fully trained on the following:
Recognition and identification of potential hazards associated with the confined spaces that will be entered.
Evaluation and control procedures for the identified or potential hazards.
All equipment such as ventilation equipment (blowers), harnesses and air quality monitors (e.g., Oxygen/combustible meters) that will be used while in the confined space.
All personal protective equipment (e.g., respirators) that the worker will be using while in the confined space.
All procedures for entering the confined space as outlined in the employer's Confined Space Hazard Assessment Program.
Procedures to follow in the event of a situation developing that could present additional risk to the worker or an emergency.
The specific work to be done while in the confined space.

64. 10. Is worker training important?
Workers with emergency rescue responsibilities will need additional specialized training.
All confined space training should include some hands-on training with the safety equipment including the personal protective equipment and safety harnesses.
Rescue procedures should be practiced frequently so there is a high level of proficiency.
Employers should keep records of all confined spaces training including refresher courses.

65. 11. Potential Hazards Overview
Oxygen Hazards
Too much or too little
Engulfment Hazards
Loose, granular materials stored in bins and hoppers - grain, sand, coal, etc.
Crusting and bridging below a worker.
Flooding of confined space.
Water or sewage flow.
Shifting liquid or solid substance that traps employee
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.

66. 11. Potential Hazards Overview
Toxic Hazards
Gases, vapors or fumes (examples: hydrogen sulfide, sulfur dioxide, carbon monoxide)
Flammable or Explosive Hazards
Vapors or dusts in concentrations large enough to ignite
Configuration
Walls or floor which slope downward or taper in can trap an employee
Physical Hazards
Contact with mechanical or electrical equipment, steam or other sources of heat, moving parts, energy.

67. 11. Potential Hazards Overview
Special 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.
Crushing

68. 11. Potential Hazards Overview
Example of possible hazards while working in a confined space:
Lack of organizational safety
Insufficient rescue measures
missing stand by person
Non existing work permit system
Lack of isolation
Oxygen deficiency / Oxygen excess
Limited entry / exit
Danger due to electrical powered tools
Electricity
Radiation
Hot or cold surfaces / mediums
Hazard chemical substances
Bad air out and NO fresh air in
Additionally to be considered:
Increased physically work loads
Chemical reactions
Fire / explosions
Noise
Fall

69. Other Hazards

70. Other Hazards

71. So, WHEN IN DOUBT, STAY OUT

72. Confined Space Quiz
1) A confined space means a space that:
A) Is large enough that an employee can enter and perform work
B) Has limited or restricted means for entry or exit
C) Both A&B
D) None of the above

73. Confined Space Quiz
2) Examples of confined spaces are:
A) Storage tanks, pits, silos, and vats
B) Tunnels, sewers, shafts, and exhaust ducts
C) Offices, carpools, and shopping stores
D) A&B

74. Confined Space Quiz
3) True or False:
The employee must assess the workplace to determine if hazards are present that necessitate the use of PPE.

75. Confined Space Quiz
4) Which are examples of permit space hazards?
A) Hazardous atmosphere, engulfment, electrocution, and heat stress
B) Storage tanks, pits, silos, and vats
C) Tunnels, sewers, shafts, and exhaust ducts
D) None of the above

76. Confined Space Quiz
5) What are some ways of reducing risks of hazards?
A) Post signs and use of barriers
B) Develop and use a written program
C) Conduct monitoring and ventilate, eliminate, or control the hazards of the confined space
D) All of the Above

77. Confined Space Quiz
6) Which of the following are required on a confined space permit?
A) Permit space, purpose, date, and authorized entrants
B) Hazards of space, control methods, acceptable
entry, and results of entry
C) Rescue and emergency services, communication procedures, and equipment
D) All of the above

78. Confined Space Quiz
7) True or False:
In the preparation of a permit space, you must notify all affected departments, post signs and barriers to protect entrants, and empty the confined space of any hazardous materials.

79. Confined Space Quiz
8) In the preparation of permit space, you must:
A) Blind or disconnect and cap all input lines
B) Verify breathing safety by air testing and add emergency control telephone numbers
C) All the above
D) None of the above

80. Confined Space Quiz
9) True or False:
During atmospheric testing, you must evaluate heat stress potential and control any hazards before entry but need not evacuate the space if the air becomes hazardous.

81. Confined Space Quiz
10) During atmospheric testing, you must:
A) Continuously test and monitor air in all areas before entry
B) Make sure that the oxygen content is between and 25.5 percent
C) List any toxic materials that could be present and their permissible exposures
D) A&C

82. Confined Space Quiz
11) Regarding safety procedures entering a confined space, which of the following applies:
A) Authorized entrants can enter a permit space only after tested and found safe
B) Each assigned entrant has to know what equipment to use and how to use it
C) Do the task as quickly and efficiently as possible
D) All the above

83. Confined Space Quiz
12) Duties of the entry supervisor include:
A) Verification of the permit and checks the condition of the confined space
B) Sees that unauthorized people are removed
C) Cancels the permit when work is done
D) All the above

84. Confined Space Quiz
13) Duties of the Stand-by person include:
A) Maintaining an accurate account of who’s in the space, monitors activities of the space, and stays in touch with the entrants
B) Keeps unauthorized persons away from an occupied permit space
C) Orders the evacuation from the permit space and summoning rescue when needed
D) All the above

85. Confined Space Quiz
14) Duties of the entrant include:
A) Knowing the hazards of the space and signs of exposure
B) Follows their personal protective equipment training and keeps in contact with the attendant
C) All of the above
D) None of the above

86. Confined Space Quiz
15) True or False:
Only workers trained in rescue can enter the space for the purpose of rescue whether an attendant is present or not.