UK construction-safety guidance by the Riskora Editorial Team
Tank entry is one of the few activities where UK enforcement appetite is high regardless of headcount or contract value — because when it goes wrong it kills multiple people, usually including the rescuers. HSE Operational Guidance OG-29 and the Confined Spaces Regulations 1997 are explicit: avoid entry where reasonably practicable; where entry is unavoidable, document a safe system of work and a rehearsed emergency arrangement. The hazards are predictable — residual liquid or vapour from previous contents, oxygen depletion from rust or biological action, flammable atmospheres from process residues, engulfment from product remaining in the base — and the controls are well-codified. What kills people is bypassing them: skipping atmospheric testing, sending a rescuer in without breathing apparatus, or relying on a top-man without rehearsed extraction. This page covers the structure a competent UK tank-entry risk assessment needs to take to satisfy a principal contractor, an HSE inspector after an incident, and the coroner.
Example Risk Assessment
Risk Assessment for Tank Entry — UK
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Required under the Confined Spaces Regulations 1997 Regulation 4 before any planned entry into a tank, vessel, silo, sump, reactor or similar enclosed plant where there is a reasonably foreseeable specified risk (loss of consciousness from fumes, lack of oxygen, fire/explosion, drowning or asphyxiation by free-flowing solids, or loss of consciousness from heat). The risk assessment must explicitly consider whether entry is necessary at all — and document why alternatives (CCTV inspection, robotic cleaning, fluid replacement) were rejected. CDM 2015 Reg 13 requires the planning, management and monitoring of the entry to be evidenced. Where flammable atmospheres may be present, DSEAR 2002 also applies. A separate written permit-to-work referencing the risk assessment is industry-standard and is expected by every tier-one principal contractor.
A specialist tank-cleaning subcontractor in Hull is contracted to internally inspect and de-sludge a 28m³ stainless tank that last held a 30% caustic detergent in a food-manufacturing site. The principal contractor requires a written risk assessment and a separate confined-spaces permit before the tank is opened. Using Riskora, the supervisor selects the Confined Space preset, identifies the residual hazard as caustic vapour and saponified sludge (engulfment risk in the sump), specifies double-valve isolation plus blind flanges on the CIP and product lines, sets continuous 4-gas monitoring with O₂ alarms at 19.5% and 23.5%, schedules forced ventilation at 5 air-changes per hour for 30 minutes before entry, and names the entrant on supplied-air, the top-man who will not enter, and the standby rescue pair drilled on tripod-and-winch extraction. The full 11-page risk assessment exports in 6 minutes and is accepted on first submission alongside the permit.
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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.