HSE Colour Coding Chart — Explained

 HSE Colour Coding Chart — Explained

Colour coding is a visual safety communication system. It helps workers quickly identify hazards, required actions, emergency equipment, safe conditions and other safety information. ISO 3864 establishes principles for safety identification colours and signs, while ISO 7010 specifies registered workplace safety signs. 

1. 🚦 Safety Sign Colours

Colour / Main meaning / Typical examples

🔴 Red / Prohibition / Fire equipment / No smoking, no entry, fire extinguisher, fire alarm

🟡 Yellow / Warning / Hazard / Electrical hazard, slippery floor, overhead load

🔵 Blue / Mandatory action / Wear helmet, wear PPE, eye protection required

🟢 Green / Safe condition / Emergency / Emergency exit, first aid, assembly point, eyewash

These meanings are based on the ISO safety-sign system. 

2. 🔴 Red — Prohibition & Fire

Red communicates danger requiring immediate attention in specific safety-sign contexts.

Examples:

🛑 No smoking

🚫 No entry

🔥 Fire equipment

🧯 Fire extinguisher

🚨 Emergency stop/fire alarm

Fire hose/reel

Remember: Red does not simply mean "danger" everywhere; the exact meaning depends on the applicable sign system.

3. 🟡 Yellow — Warning

Yellow is commonly used to indicate caution or a physical hazard.

Examples:

⚡ Electrical hazard

⚠️ General warning

Slippery surface

Trip/fall hazard

Moving machinery

Overhead hazards

Chemical hazards

OSHA's physical-hazard colour requirements specifically identify yellow as the basic colour for caution and physical hazards such as striking, stumbling, falling, tripping and caught-between hazards. 

4. 🔵 Blue — Mandatory Action

Blue generally tells the worker:

> "You MUST do this."

Examples:

🪖 Wear safety helmet

🥽 Wear eye protection

🧤 Wear gloves

👂 Wear hearing protection

😷 Wear respiratory protection

🥾 Wear safety footwear

Use required fall protection

5. 🟢 Green — Safe Condition

Green communicates safe conditions, emergency escape or first-aid information.

Examples:

🚪 Emergency exit

🏃 Escape route

🩹 First-aid station

👁️ Eyewash station

🚿 Emergency shower

📍 Assembly point

Safe-condition information

6. 🟠 Orange — Important Warning/Warning Tags

Orange is commonly encountered in systems such as OSHA warning tags, where OSHA's recommended colour coding uses orange predominantly for WARNING. 

Examples:

Machinery hazards

Serious warning information

Certain biological-hazard markings

Do not confuse this with the ISO basic safety-sign colour system, where yellow is the standard warning colour.

7. ⚫ Black / ⚪ White — Contrast & Identification

Black and white are frequently used as contrast, text, boundaries and general identification/housekeeping markings.

Examples:

Equipment boundaries

Storage areas

Traffic/housekeeping markings

Text and symbols on safety signs

Black/yellow hazard striping

The exact application depends on the site's marking standard.

8. 🟨⬛ Yellow/Black — Physical Hazard Marking

Commonly used for:

Steps and edges

Low headroom

Moving equipment hazards

Openings

Collision hazards

Areas where people could be struck, caught or fall

The precise marking scheme should follow the applicable national/site standard.

9. 🟩🟥🟦 Floor & Area Markings

A common workplace practice is:

🟩 Green — safe walkways/escape routes

🟥 Red — fire equipment/emergency areas

🟨 Yellow — caution/restricted or hazard areas

🟦 Blue — designated work/equipment areas

🟨⬛ Yellow/black — physical hazards

⚠️ Important: Floor-marking colours are not one universal global HSE code. Your facility's approved colour-marking procedure takes precedence.

10. 🧯 Fire Extinguisher Colours

Extinguisher body colours vary by country, manufacturer and standard. Therefore, don't identify an extinguisher solely by colour.

Identify it by:

Label

Extinguishing medium

Fire class

Operating instructions

Manufacturer's markings

For example, an extinguisher may contain water, foam, dry chemical powder, CO₂ or wet chemical, but its external colour scheme is not universally identical.

11. 🛢️ Pipe & Process Identification

Pipe identification is a separate subject from the basic ISO safety-sign colours. ISO 20560-1:2024 specifies safety information for the contents and hazards of above-ground piping systems. 

Common site schemes may use colours to distinguish:

Water

Steam

Compressed air

Fuel/oil

Natural gas

Firewater

Chemicals

Nitrogen/inert gas

Waste/effluent

Never assume a pipe colour without checking the facility's pipe-identification standard and flow-direction markings.

12. 🗑️ Waste Colour Coding

Waste colour schemes are not universally identical. A site may establish colours for:

General waste

Recyclables

Organic waste

Hazardous waste

Chemical waste

Medical waste

E-waste

Always follow the site's approved waste-management procedure.

⭐ Easy Memory Rule

🔴 RED = STOP / FIRE

🟡 YELLOW = BE CAREFUL

🔵 BLUE = MUST DO

🟢 GREEN = SAFE / ESCAPE

🟠 ORANGE = WARNING in applicable systems

⚫/⚪ BLACK & WHITE = IDENTIFICATION / CONTRAST / MARKING

⚠️ HSE Golden Rule

Colour coding is not universal across every HSE application. Safety-sign colours have internationally standardized meanings, but pipe identification, waste bins, PPE colours, extinguisher bodies, floor markings and tank colours can vary by country, industry, manufacturer or site procedure. Always verify the applicable standard before relying on a colour alone. ISO 7010 is currently the published reference for registered safety signs, while a new ISO/DIS 7010 revision is under development. ⛑️🚨📝🚧🏗️🚥🎯💯🦺🌡️✅

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