Confined Space Entry: Manholes with Excessive Heat

Date: 2025-08-22

Duration: [DURATION] minutes

Presenter: [PRESENTER NAME]

Location: [LOCATION]

Objective

The objective of this toolbox talk is to ensure all personnel understand and can implement the necessary safety measures to safely enter and work in manholes with excessive heat and potential thermal hazards.

Introduction

Today's toolbox talk will cover the safety procedures for confined space entry into manholes, specifically addressing the hazards associated with excessive heat and potential thermal issues. We will review required ventilation practices, appropriate personal protective equipment (PPE), and essential components of an emergency rescue plan.

Key Points

• Continuous Monitoring: Ensure continuous monitoring of workers inside the manhole for signs of heat stress, fatigue, or other health issues. The buddy system is crucial for this.
• Ventilation Equipment Maintenance: Regularly check and maintain ventilation equipment to ensure it is functioning correctly and providing adequate airflow. Replace filters and repair any malfunctions promptly.
• Atmospheric Testing: Before entry, test the atmosphere inside the manhole for oxygen levels, flammable gases, and toxic substances. Continuous monitoring should be conducted throughout the work period.

Hazard Identification

Manholes, due to their enclosed nature, can accumulate excessive heat, creating a dangerous environment for workers. Understanding these hazards is crucial for preventing heat-related illnesses and ensuring a safe working environment.

• Excessive Heat Buildup: Heat stroke, heat exhaustion, dehydration, burns from hot surfaces, increased risk of other incidents due to impaired judgment and physical ability.
• Poor Ventilation: Increased heat, humidity, and potential for toxic gas accumulation, leading to asphyxiation or other health issues.
• Thermal Contact Hazards: Burns from contact with hot pipes, equipment, or surfaces within the manhole.
• Slips, trips, and falls: Injuries ranging from minor sprains to severe fractures due to slippery or uneven surfaces, exacerbated by heat stress.

Control Measures

• Ventilation: Prior to entry, ventilate the manhole to reduce heat and humidity. Use mechanical ventilation systems to ensure continuous airflow. Monitor temperature and humidity levels regularly.
• Isolation and Lockout/Tagout: Ensure all potential heat sources (e.g., steam lines, electrical equipment) are properly isolated and locked out/tagged out before entry to prevent accidental activation or release of heat.
• Establish a Cooling Area: Set up a shaded and cool rest area near the manhole for workers to take breaks and rehydrate. Provide cooling devices such as fans or cooling vests.
• Buddy System: Implement a buddy system to monitor workers for signs of heat stress or other health issues. Ensure regular communication and observation.
• Regular Breaks and Hydration: Mandate frequent breaks in a cool area and provide access to plenty of water or electrolyte drinks to prevent dehydration.

Personal Protective Equipment (PPE) Requirements

• Hard Hat: Wear a hard hat to protect against head injuries from falling objects or bumping into structures.
• Thermal Gloves: Use gloves that provide both thermal protection and protection against cuts, abrasions, and potential contaminants. Ensure gloves are in good condition and fit properly.
• Protective Clothing: Wear appropriate clothing that provides thermal protection while allowing for breathability. Consider using cooling vests or moisture-wicking fabrics to help regulate body temperature.
• Safety Boots: Safety boots should be worn at all times. [1] [2] [3] [4] [5] [6]

Group Discussion

Discuss the following questions:

1. What are the early signs of heat stress that we should watch for in ourselves and our coworkers?
2. How can we improve our communication during confined space entry to ensure everyone's safety?
3. What additional control measures can we implement to further reduce the risk of heat-related incidents in manholes?

Emergency Procedures

1. Immediately remove the affected worker from the hot environment.
2. Provide water or electrolyte-containing beverages if the worker is conscious.
3. Seek immediate medical attention if symptoms worsen or do not improve.

Summary

Recap of main points:

• Excessive heat in manholes poses significant risks, including heat stroke and burns.
• Proper ventilation, PPE, and emergency procedures are critical for safe entry and work.
• Continuous monitoring and communication are essential to prevent heat-related incidents.

Action Items

Specific actions participants should take:

1. Review and understand the site-specific confined space entry procedures.
2. Inspect PPE before each use to ensure it is in good condition.
3. Participate actively in pre-entry briefings and hazard assessments.

Report all hazards, near-misses, and incidents to your supervisor immediately.

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