What Is Confined Space? Definition And Examples Of Confined Space 2023

What Is Confined Space- Working In Confined Spaces Can Cause Serious Injury Or Even Death In Any Industry, From Complex Equipment To Simple Storage. Victims Of Accidents In Confined Spaces Include Not Only The People Who Work In Them, But Also Those Who Try To Rescue Them Without Proper Training And Equipment. Therefore, First Of All, It Is Very Important To Know About What Is A Confined Space, Its Risks And Preventive Measures To Avoid Any Untoward Incident. What Is Confined Space? Definition And Examples Of Confined Space 2023

There Are Thousands Of People Who Put Their Lives At Risk In The Workplace Every Day, But Having The Right Training, Recognizing The Risks And Knowing What Procedures To Follow Can Help Increase Your Chances Of Staying Safe At All Times. Help May Be Available. Now Let’s See Below What Is Limited Space.

What Is Confined Space?

Confined Space Is Defined As An Area Or Place That Has Limited Or Limited Means Of Entry Or Exit. In Addition, It Is Not Intended For Continuous Human Habitation And May Contain A Number Of Hazards.

For Example, Our Room Is Also Closed From All Sides And Has A Convenient Door To Enter And Exit, And It Is Designed For Our Living, We Can Stay In It Continuously. But This Is Not The Case Of Confined Space, It Is Not Created For Human Habitation, It Contains Many Kinds Of Dangers, It Is A Place Where There Is A Risk Of Serious Injury Or Death Of Working People.

What Is Confined Space? Definition And Examples Of Confined Space 2023

Also Read: What Is Near miss? Examples of Near miss 2023

Types Of Confined Space

After You Know What A Confined Space Is, It Is Important To Know Its Types. It Is Quite Easy To Identify Some Confined Spaces Such As A Place That Has Limited Openings:-

  • Storage Tanks
  • Strong
  • Reaction Vessels
  • Closed Drains
  • Sewerage
  • Wells
  • Tunnels
  • Pits
  • Box
  • Shafts

Other Confined Spaces May Be Less Obvious But Just As Dangerous, Such As:-

  • Chambers
  • Vats
  • Combustion Chambers In Furnaces
  • Tubing
  • Unventilated Or Poorly Ventilated
  • Rooms
  • Chimneys
  • Hatches.

It Is Not Possible To Provide A Complete List Of Restricted Space. Some Spaces May Become A Closed Space During Their Construction Or Subsequent Modification During The Execution Of Works.

Risks In A Confined Space

After Understanding What A Confined Space Is And The Types Of Confined Space, Comes The Dangers That Exist Within It. If Visible, A Confined Space May Also Be A Large Space That Is Sufficient For Worker Entry But Has Limited Means Of Entry Or Exit. It Lacks Ventilation And Is Not Designed To Operate Continuously For Long Periods Of Time. Entering A Confined Space Can Be A Risk Because It Involves Different Types Of Hazards. Below Are The Confined Space Hazards That Need To Be Assessed.

1. Toxic Atmosphere

Confined Spaces May Contain Toxic Hazards That Can Only Be Detected By Testing. Lack Of Oxygen (O2), Hydrogen Sulfide (H2S), Carbon Monoxide (CO) Are Common Confined Space Hazards That Can Be Detected With A Portable Gas Monitor.

Depending On The Environment And The Nature Of The Work, Workers Working In Confined Spaces May Be Exposed To Large Amounts Of Toxic Elements.

For Example, Generators Used In An Enclosed Space Produce Carbon Monoxide (CO) In The Exhaust Gases, Which Is A Serious Toxic Hazard.

2. Flammable Gas

There May Be Flammable Gases Inside The Confined Space Which May Explode If They Come Into Contact With An Ignition Source. These Gases Or Vapors Can Be Detected With The LEL Monitor.

In Order To Burn, There Must Be A Minimum Concentration Of Flammable Gases Or Vapors In The Air. This Quantity Is Called The Lower Explosive Limit (LEL). At Concentrations Equal To Or Greater Than This, Combustion Will Only Occur In The Presence Of A Suitable Ignition Source Such As A Spark Or Hot Surface. Therefore, It Is Important To Detect The Presence Of Flammable Gas Or Vapor, Which Can Be Detected By Looking At The LEL Percentage From A Gas Monitor.

3. High Or Low Oxygen Levels

If It Falls Below 19.5% Or Above 23.5%, The Environment Is Considered Unsafe. If The Concentration Drops To 17%, The Mental And Physical Balance Of A Person Is Significantly Disturbed And Can Lead To Death.

A Large Amount Of Oxygen Is Also Quite Dangerous, Because If Its Amount Exceeds 23.5%, There Is A Risk Of Fire And Explosion. Materials That Do Not Normally Burn, From Clothing To Grease, Can Spontaneously Combust Under Conditions Of Excess Oxygen. And Because Of Which There Is A Possibility Of An Explosion.

4. Physical Hazards

In Addition To These Hazards, There May Also Be Some Physical Hazards Inside The Confined Space, E.G.

Improper Use Of Ladders And Scaffolding, Wet Surface, Uneven Surface, Narrow Area Or Poor Lighting, Vibration, Excessive Noise, Very Cold Or Hot Temperature, Ingestion, Etc. May Cause Physical Danger To Workers Inside The Confined Space.

Also Read: What Is Manual Handling? Examples of Manual Handling

Safety Measures For Confined Spaces

1. Avoid Entering The Confined Space

After Reading What Confined Space And Its Hazards Is, You Will Definitely Want To Avoid Working In It. First You Have To Think About Whether The Work Can Be Done In Another Way? To Prevent Entry Into A Confined Space. Better Planning Or A Different Approach Can Reduce The Need To Work In Confined Spaces.

  • Ask Yourself If The Desired Action Is Really Necessary Or If You Can Do It Without Going To It:
  • If Possible, Work Outside, E.G.
  • Blockages In Silos Can Be Removed Using Remote-Controlled Vibrators Or Air Scrubbers;
  • Inspection, Sampling And Cleaning Can Be Done Externally Using Appropriate Equipment.

2. Risk Assessment And Safe System Of Work

If Entry Into A Confined Space Is Necessary, A Safe System Of Work Should Be Established After A Risk Assessment Has Been Carried Out By The Owner Of The Facility Prior To Working In It.

Appoint A Team Of “Competent Persons” Who Can Carry Out A Risk Assessment Of The Conditions And Risks Of The Work And Activities Carried Out In The Confined Space And, Based On The Findings, Take The Necessary Safety Measures To Avoid Endangering Workers. Can Identify.

3. Select Trained And Experienced Workers

  • It Is Important To Select The Right Workers For Working In A Confined Space.
  • Workers Should Receive Proper Training In CSE (Confined Space Entry).
  • Ensure That Workers Are Sufficiently Experienced In The Type Of Work They Are Expected To Perform;
  • The Breathing Apparatus Must Be Suitable For Wearing If The Work Requires The Use Of Such Equipment,
  • And The Worker Should Be Completely Medically Fit To Work In A Confined Space And Should Not Have Any Phobia.

4. Device Isolation

Disconnect And Properly Switch Off The Electrical Connections Of All Machinery And Equipment That Could Cause A Hazard In The Confined Space. Evacuate Pipes And Connections That Could Cause Danger; Take Effective Measures To Prevent Hazardous Gases, Vapors, Dust, Smoke, Or Flowing Solids And Liquids From Entering The Confined Space. Ensure That All Input And Output Connections Of The Equipment In Which Work Is To Be Carried Out In The Confined Space Are Completely Isolated By Blinding.

5. Cleaning And Cooling

The Confined Space Must Be Adequately Cleaned And Sanitized To Ensure That No Sludge Or Other Deposits Release Hazardous Gases, Vapors, Dust Or Fumes During The Work. If Steam Cleaning Is Used, Sufficient Cooling Time Should Be Allowed To Ensure That It Is Safe To Work In A Confined Space.

6. Check The Record Size

Is The Entrance Large Enough To Allow Easy Passage In And Out Of Workers With All Required Equipment And To Provide Safe Access And Egress In The Event Of An Emergency? For Example, If The Entrance Is Narrow, An Air Breathing System Should Be Used Instead Of A Self-Contained Breathing Apparatus, Which Is Bulkier And Therefore Restricts Passage.

7. Provision Of Ventilation

You Can Increase The Number Of Openings In A Confined Space To Improve Ventilation.

Circulation Of Clean Air Is Essential Inside The Enclosed Space. Mechanical Ventilation Is Necessary To Ensure A Sufficient Supply Of Fresh Air. Do Not Use Oxygen To Freshen The Air Inside An Enclosed Space, As This Greatly Increases The Risk Of Fire Or Explosion.

Sufficient Fresh Air Supply Is Particularly Important When The Combustion Plant Is Used Inside A Confined Space Due To The Danger Posed By The Accumulation Of Engine Exhaust Gases. Such As Welding, Cutting, Etc.

Note:- Exhaust Gases From Fuel Engines Contain Carbon Monoxide (CO) Which Is So Dangerous That The Use Of Such A Device Should Never Be Allowed In Enclosed Spaces.

8. Air Testing

Before Each Entry Into A Closed Space, It Is Necessary To Check That The Air Is Free Of Toxic And Flammable Gases, That There Is No Lack Of Oxygen Inside,

Air Testing Should Be Performed By A Competent Person Using A Suitable Gas Detector That Is Properly Calibrated. Continuous Gas Monitoring Is Also Required If Indicated In The Risk Assessment Or As An Additional Precaution As Recommended By A Competent Person.

9. Special Tools And Lighting

Non-Sparking Tools And Especially The Provision Of Non-Flammable Lighting Are Essential If Flammable Or Potentially Explosive Environments Are Likely To Be Present. In Some Confined Spaces (Such As Inside Metal Tanks), Appropriate Measures To Prevent Electric Shock Include The Use Of Additional Low-Voltage Equipment. A Device Equipped With 12V DC And ELCB Should Be Used For Lighting.

10. Personal Protective Equipment

Before Entering The Confined Space, It Is Necessary To Ensure That, In Addition To The Mandatory PPE, Workers Also Wear Other PPE According To The Job And Written In The Permit.

And If The Risk Assessment Specifies The Wearing Of An Approved Breathing Apparatus, It Should Be Worn To Provide Adequate Protection With Regard To The Atmosphere Of The Confined Space;

It Is Also Important To Ensure That Anyone Going Into A Confined Space Is Wearing A Suitable Safety Harness Attached To A Lifeline That Is Strong Enough To Be Pulled Out In An Emergency. It May Be Useful.

11. Issuance Of PTW And CSE Certificate

Before Starting Work Inside The Confined Space, A CSE Certificate Should Be Issued, Which Is Proof That Entry Into The Confined Space Is Safe And That It Has Been Completely Isolated, Cleaned And Sanitized. And There Should Be No Danger In The Situation. After Issuing CSE Certificate, It Is Also Very Important To Issue Permit To Work (PTW) According To The Work To Be Done In It. To Be Able To Control Hazards Arising At Work And Use Appropriate PPE.

12. Presence Of Hole Watcher

A CSE Attendant/Hole Watcher Must Be Kept Outside The Confined Space Entrance Along With The PTW. Which Can Record The Names And Time Of Workers Who Come In And Go Out Using A Log Book. And It Can Also Communicate With The Workers Inside. The CSE Attendant/Hole Watcher Is Also Responsible For Calling Emergency Services In Case Of Any Emergency.

13. Contingency Planning

In Order To Meet Any Serious Threat To Workers Inside The Confined Space, Appropriate Emergency Procedures Should Be Designed And Implemented According To The Nature Of The Confined Space, The Risks Involved And The Emergency Rescue.


Q1. What is confined space and its types?

Ans: A confined space is an enclosed area with limited entry and exit points. It is not designed for continuous occupancy and may have hazardous conditions.

Its Type

  • Storage Tanks
  • Strong
  • Reaction Vessels
  • Closed Drains
  • Sewerage
  • Wells
  • Tunnels
  • Pits
  • Box
  • Shafts
Q2. What are hazards in confined space?
  • Toxic Atmosphere
  • Flammable Gas
  • High Or Low Oxygen Levels
  • Physical Hazards

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