RAMS for Confined Space Entry

Confined space work carries some of the highest fatality rates in the construction and utilities sectors. The HSE's own data shows that rescuers die attempting to save colleagues in confined spaces because the rescue was improvised rather than planned. Getting the RAMS right is not a formality — it is the difference between a safe entry and a body recovery.

The Legal Basis

The duty to risk-assess confined space work sits with your employer under the Management of Health and Safety at Work Regulations 1999 (MHSWR), reg 3. The Confined Spaces Regulations 1997 then set the specific requirements:

- **Reg 4** — avoid entry if reasonably practicable. If the task can be done from outside (using remotely operated equipment, long-handled tools, or camera inspection), entry must not take place. - **Reg 5** — if entry cannot be avoided, it must be under a safe system of work. Emergency rescue arrangements are a legal precondition of entry, not an afterthought. You cannot begin work until rescue arrangements are in place.

CDM 2015 requires a construction phase plan. It does not require a RAMS — the duty to produce a risk assessment for confined space entry is MHSWR reg 3, always.

Key Hazards and Controls in Hierarchy Order

**1. Eliminate the need to enter** Can the inspection, repair, or cleaning be done from outside? If yes, do not enter. This is not optional — reg 4 requires you to explore this first and document why entry was unavoidable if you proceed.

**2. Engineering controls (before people)** - Forced ventilation to dilute and remove contaminants before and during entry - Atmospheric testing before entry and continuously during work: oxygen (safe range 19.5–23.5%); flammable gases kept below 10% of the Lower Explosive Limit (LEL); and toxic gases (CO, H₂S and task-specific substances) measured against their Workplace Exposure Limits in ppm. The LEL applies only to flammable gases — toxic gases are controlled against their WELs, not the LEL. - Isolation of all services (mechanical, electrical, hydraulic) using physical isolation — not just switching off - Purging pipework and vessels before entry begins

**3. Administrative controls** - Permit-to-enter system with a competent supervisor who remains outside - Continuous atmospheric monitoring with calibrated, bump-tested gas detectors - Entrant numbers kept to the minimum necessary - Communication arrangements between entrant and standby person — continuous, not periodic check-ins - Pre-entry briefing covering hazards, controls, and the emergency plan

**4. Personal Protective Equipment — last in the hierarchy** - Breathing apparatus (SCBA or airline) where atmospheric hazards cannot be adequately controlled by ventilation - Harness and lifeline where retrieval is part of the rescue plan - Head and body protection appropriate to the physical environment

Collective protection (ventilation, physical isolation, atmospheric monitoring) must be in place before PPE is relied upon. PPE alone is never an adequate control for atmospheric hazards in a confined space.

Emergency Rescue: The Most Common Failing

Reg 5 rescue arrangements must be specific and in place before the first person enters. The most common reason a confined-space RAMS is rejected or fails in practice:

- Rescue plan says "call 999" — this is not a rescue arrangement; fire and rescue response times mean it is a recovery plan - No designated, trained standby person present at the entry point throughout - Rescue equipment (tripod, winch, BA set) not on site or not checked - Rescue personnel not briefed on the plan before entry begins

What a Confined Space RAMS Must Include

- Identification of the space and classification (confined space or particularly dangerous confined space) - Evidence that elimination of entry was considered and why it was not reasonably practicable - Atmosphere test results (pre-entry) and monitoring method during entry - Isolation schedule for all services - Named competent supervisor and standby person - Communication method and frequency - Emergency rescue procedure — specific, not generic; equipment listed, rescue personnel named - Permit-to-enter reference - Residual risk rating after all controls applied