Plumbing RAMS — Risk Assessments and Method Statements for Plumbers

TL;DR

Plumbing work involves hot works, working in confined spaces, manual handling of heavy pipework and potential legionella risks on commissioning. Every plumbing contractor must prepare RAMS covering each significant work phase and ensure workers are briefed and signed-off before work begins.

Typical Plumbing Tasks on Construction Sites

• Hot and cold water supply pipework installation
• Soil, waste and rainwater drainage pipework
• Gas supply pipework (Gas Safe registered operatives only)
• Underfloor heating systems
• Sanitary ware installation
• Boiler and plant room installation
• Commissioning and testing
• Temporary plumbing during construction
• Water main connections and isolation

Common Hazards for Plumbing Work

Hot Works (Soldering and Brazing)

Flame-based jointing methods create significant fire risk, particularly in voids and concealed spaces. A hot works permit must be in place before any flame work, and a 30-minute fire watch must be completed after work is done.

Legionella Risk During Commissioning

Newly installed pipework that sits stagnant can support legionella bacteria growth. Commissioning procedures must include flushing, disinfection and temperature verification. Risk is heightened in deadlegs, low-use outlets and lukewarm storage.

Manual Handling

Cast iron soil pipes, copper and steel pipework, and heavy plant items create significant manual handling risks. Mechanical aids, team lifts and correct posture must be addressed in the RAMS.

Working in Confined Spaces

Pipe runs through ceiling voids, risers and service ducts can constitute confined spaces. A separate confined space risk assessment and permit to work is required.

Working at Height

Roof drainage and pipework in plant rooms often requires working at height. Suitable access equipment and a working at height assessment are required.

Control Hierarchy

1. Eliminate — use push-fit or press-fit jointing to remove the need for hot works
2. Substitute — use plastic pipework systems instead of copper/steel where appropriate
3. Engineer — isolate water systems properly before work; use proper purging procedures for gas
4. Administrative — hot works permits; legionella risk assessments; working at height plans
5. PPE — gloves, safety glasses, knee pads, safety boots, appropriate respiratory protection

PPE Requirements

RAMS Sign-off Workflow

1. Plumbing supervisor prepares RAMS for each work phase (first fix, second fix, commissioning)
2. Hot works permit procedures referenced in RAMS and understood by all operatives
3. Principal contractor reviews and approves before work starts
4. Pre-task briefing delivered with attendance record
5. Hot works permits issued per shift for any flame work
6. Commissioning RAMS reviewed separately before system energisation

Site Evidence Checklist

• RAMS prepared and approved before work starts
• Hot works permits in place (daily per shift)
• Gas Safe registration confirmed for any gas work
• 30-minute fire watch records maintained
• Legionella risk assessment completed before commissioning
• System flush and disinfection records kept
• Working at height plan in place where applicable
• All workers briefed and signed on RAMS

FAQs

Does every plumber need to be Gas Safe registered?

Any work on gas fittings must be carried out by a Gas Safe registered engineer. This applies to new installations, alterations, servicing and certification. Working on gas without registration is illegal.

What is the 30-minute fire watch rule?

After any flame-based hot works, the operative must remain in the area for at least 30 minutes to check for smouldering materials. The hot works permit must be signed off confirming the fire watch was completed.

When does a legionella risk assessment need to be done?

A legionella risk assessment should be carried out before the water system is commissioned. It identifies risk factors such as water temperature, deadlegs, and infrequently used outlets and sets out a management plan.

Must plumbing RAMS be separate from the general RAMS for the project?

Plumbing RAMS can form part of the project-wide RAMS or stand alone — the principal contractor usually decides their preferred approach. What matters is that the content is specific to the plumbing scope and hazards, not generic.

Can the same RAMS cover both first and second fix?

Usually not — the hazards and tasks are different enough to warrant separate documents. First fix involves structural work, heavy pipework and voids; second fix involves sanitary ware, fittings and final connections. Each should have its own RAMS.