What must be included in a risk assessment for this work?

Classification of the confined space and reason for entry. Atmospheric hazards: O₂ depletion, toxic gases (H₂S, CO, CH₄), flammable atmospheres. Physical hazards: engulfment, entrapment, flooding, mechanical equipment. Pre-entry atmospheric testing requirements and equipment. Continuous monitoring during entry. Ventilation arrangements (mechanical or natural). Rescue plan with trained rescue team and equipment. Permit-to-work system and authorisation process. Communication between entrant and top person. PPE/RPE requirements including BA sets where necessary

Risk Assessment for Confined Space Entry — UK

UK construction-safety guidance by the Riskora Editorial Team

Confined spaces are unpredictable and unforgiving. A space that was safe yesterday can be lethal today. Sewers, manholes, tanks, silos, and deep trenches all present risks from toxic gases, oxygen depletion, and engulfment — risks that cannot be seen, smelled, or anticipated without proper assessment. A risk assessment for confined space entry is not just a legal requirement — it is the difference between a routine job and a fatal incident.

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Example Risk Assessment

Classification of the confined space and reason for entry
Atmospheric hazards: O₂ depletion, toxic gases (H₂S, CO, CH₄), flammable atmospheres
Physical hazards: engulfment, entrapment, flooding, mechanical equipment
Pre-entry atmospheric testing requirements and equipment

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When This Document Is Required

The Confined Spaces Regulations 1997 impose a strict duty to assess the risks of confined space entry before any person enters. This assessment must determine whether entry can be avoided entirely. Where entry is unavoidable, the risk assessment forms the basis of the safe system of work, permit-to-work, and emergency rescue arrangements. Under CDM 2015, confined space work on construction sites must be specifically addressed in the construction phase plan. The risk assessment must be completed by a competent person and communicated to all entrants.

What Must Be Included

Classification of the confined space and reason for entry
Atmospheric hazards: O₂ depletion, toxic gases (H₂S, CO, CH₄), flammable atmospheres
Physical hazards: engulfment, entrapment, flooding, mechanical equipment
Pre-entry atmospheric testing requirements and equipment
Continuous monitoring during entry
Ventilation arrangements (mechanical or natural)
Rescue plan with trained rescue team and equipment
Permit-to-work system and authorisation process
Communication between entrant and top person
PPE/RPE requirements including BA sets where necessary

Common Mistakes to Avoid

Assuming a space is safe because 'it was fine last time'
Not testing the atmosphere before every entry — even re-entries
Relying on emergency services for rescue instead of having on-site capability
Entering to rescue a collapsed colleague without proper equipment and training
Using the wrong gas detector or failing to calibrate before use
Not issuing a new permit-to-work when conditions change

Example Scenario

A utilities maintenance team in Manchester needs to enter a pumping station wet well to replace a submersible pump. The space is classified as a confined space with potential for methane and hydrogen sulphide accumulation. Using Riskora, the team leader completes a confined space risk assessment covering atmospheric testing, continuous monitoring, rescue arrangements, and BA set requirements — generating professional documentation in minutes and ensuring the permit-to-work is properly supported.

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Riskora is an assistive document preparation tool. All documents generated must be reviewed, verified, and approved by a competent person before use on site. Riskora does not replace professional safety judgment, and no output should be treated as a legal compliance guarantee.