When this template fits
This RAMS is for UK contractors and plumbing teams carrying out power flushing — typically because a principal contractor or client has asked for a risk assessment and method statement before work can start. It covers the recognised building services & m&e hazards for this task, with the controls a reviewer expects to see.
What this RAMS includes
- ✓ 9 task-specific hazards scored on a 5×5 matrix (initial → residual)
- ✓ Specific control measures for each hazard, in hierarchy-of-control order
- ✓ A 10-step method statement (sequence of works)
- ✓ PPE, plant/equipment, permits and competence requirements
- ✓ Emergency arrangements and operative briefing / sign-off section
Scope of works
Power-flush heating systems with chemicals and water.
Sequence of works
- 1Pre-work planning: review Legionella risk assessment, obtain SDS for all chemicals, complete COSHH assessment, confirm waste disposal route, and notify occupants of work and heating downtime.
- 2Isolate and allow the heating system to cool to below 40 °C; confirm system pressure is zero by venting at a safe point before making any connections.
- 3Lay floor protection (drip trays, absorbent mats) at all connection and discharge points; erect wet floor signs and restrict occupant access to the work area.
- 4Connect the power flush machine to the heating circuit at an appropriate access point (e.g. pump or magnetic filter connection) using correct-size hose adaptors; inspect all connections for tightness.
- 5Commission the machine on clean water at low pressure first to confirm no leaks; rectify any leaks before proceeding to chemical dosing.
- 6Wearing chemical-resistant PPE, introduce the descaler or cleaning chemical dose in accordance with the manufacturer's instructions and COSHH assessment; monitor system for leaks throughout.
- 7Carry out the power flush cycle, systematically isolating and opening individual radiators and circuits as required; monitor discharge water clarity and pH; repeat until clean water runs clear.
- 8Introduce the corrosion inhibitor dose to the system as per manufacturer's specification; flush to distribute and confirm pH and inhibitor levels with test kit.
- 9Disconnect all hoses safely; collect and neutralise all waste chemically-treated water; dispose of waste in accordance with the agreed waste disposal plan and regulatory requirements.
- 10Restore the system to normal operation, check for leaks at all disturbed connections, remove all floor protection and signage, clean the work area, and provide the client with a system report including chemical doses applied.
Hazards, risk rating & controls
Risk = likelihood × severity (1–25). Initial is before controls; residual is with controls applied.
Chemical skin/eye contact
Who’s at risk: Operatives, Other trades on site, Members of the public
- › Select the least hazardous chemical formulation that achieves the required flushing outcome; avoid concentrated acids where neutral or alkaline alternatives are effective.
- › Obtain and review Safety Data Sheets for all chemicals used; complete a written COSHH assessment before work begins and communicate findings to all operatives.
- › Wear chemical-resistant gloves (nitrile minimum), safety goggles or face shield, and chemical-resistant overalls when handling, mixing or connecting chemical doses.
- › Provide a portable sterile eye-wash station at the work location before chemicals are introduced to the system.
Inhalation of chemical vapours or mists
Who’s at risk: Operatives, Other trades on site, Members of the public
- › Ensure the work area is well ventilated by opening windows and doors; use forced ventilation (fan) if the space is enclosed before introducing chemicals.
- › Review SDS section 8 for occupational exposure limits and confirm whether the substance has a WEL listed in EH40; document controls required.
- › Where adequate ventilation cannot be assured, wear an FFP3 half-mask respirator or chemical cartridge respirator appropriate to the substance's WEL and vapour type.
Chemical spill and environmental contamination
Who’s at risk: Operatives, Other trades on site, Members of the public
- › Plan the collection, neutralisation and disposal of chemically-treated flush water before work starts; obtain consent from the water authority if discharging to sewer above permitted concentrations.
- › Provide drip trays, spill kits and sufficient collection vessels at all connection and discharge points; contain all chemically-treated water prior to authorised disposal.
- › Test pH of waste water before disposal; neutralise as required and confirm acceptability with the receiving authority.
Manual handling of equipment and hoses
Who’s at risk: Operatives, Other trades on site, Members of the public
- › Use a sack truck or wheeled trolley to move the power flush machine and heavy chemical containers; avoid manual carrying over distances.
- › Assess load weights, posture, frequency and environment (e.g. stairs, confined plant rooms); implement team lifts or mechanical aids where individual loads exceed 20 kg.
- › Ensure all operatives have received manual handling awareness training appropriate to the task.
Scalding from hot water release
Who’s at risk: Operatives, Other trades on site, Members of the public
- › Allow the heating system to cool to below 40 °C before connecting or disconnecting power flush hoses and fittings.
- › Isolate system pressure and vent the circuit at a safe point to confirm pressure is zero before any disconnection.
- › Wear heat-resistant and waterproof gloves when working at connection points where residual heat or pressure may remain.
Water leak causing slips
Who’s at risk: Operatives, Other trades on site, Members of the public
- › Check all hose connections, isolation valves and temporary fittings for tightness and condition before starting the pump.
- › Lay absorbent mats and drip trays beneath all connection points; keep absorbent spill kit accessible throughout.
- › Erect wet floor warning signs and restrict access to the work area for non-essential personnel, including building occupants.
Legionella and waterborne biological hazard
Who’s at risk: Operatives, Other trades on site, Members of the public
- › Obtain the building's water hygiene / Legionella risk assessment before commencing work; confirm system water conditions and any prior Legionella treatment history.
- › Control system pressure to minimise misting and aerosol release at discharge points; use enclosed discharge hoses directed to sealed collection vessels.
- › Dose the system with an appropriate biocide (as identified by COSHH assessment) to reduce biological risk during flushing.
- › Where aerosol release cannot be fully controlled, wear an FFP3 respirator.
Electric shock from pump equipment
Who’s at risk: Operatives, Other trades on site, Members of the public
- › Where practicable, use 110 V centre-tapped-to-earth or battery-operated power flush equipment to reduce shock risk.
- › Plug all 230 V electrical equipment into a portable RCD (30 mA trip) and inspect the unit before use.
- › Inspect the power flush machine cable, plug and casing before use; confirm current PAT test label is present; remove from service if defective.
- › Position the power flush machine and its power supply outside the zone where leaks or spills are likely; route cables away from wet areas.
Nuisance and disturbance to building occupants
Who’s at risk: Operatives, Other trades on site, Members of the public
- › Notify building occupants in advance of the planned work, expected duration, and any loss of heating or hot water; agree access arrangements with the client.
- › Erect physical barriers or tape off work areas to prevent unauthorised occupant access, particularly where chemical containers or wet floors are present.
- › Plan the flushing programme to minimise heating system downtime; coordinate with occupants to carry out work at agreed times.
PPE
- ✓ Safety footwear (EN ISO 20345)
- ✓ Hi-vis clothing
- ✓ Safety gloves (task-appropriate)
- ✓ Hard hat (EN 397) where overhead risk or site rules require
- ✓ RPE per the COSHH assessment
- ✓ Chemical-resistant gloves
- ✓ Insulated gloves where live work is unavoidable
Competence
- ✓ Site induction completed; CSCS or equivalent where the site requires it
Schemes (CSCS, PASMA, IPAF…) evidence competence; they are not statutory requirements in themselves.
Plant & equipment
- › Isolation valves / pipe-freezing kit
- › Gas tightness test gauge (gas work)
- › Press tool or soldering/brazing set
- › MEWP or tower for high-level plant
- › LEV / extraction for brazing fume
Permits & legislation
What principal contractors usually check
- ✓ Named competence where required (Gas Safe / F-Gas / Part P)
- ✓ Service isolation and test-before-touch (gas tightness, electrical lock-off)
- ✓ Hot-works permit and fire watch for brazing/soldering near combustibles
- ✓ The document is site-specific — real address, access arrangements and dates, not a generic template
- ✓ Hazards match the actual task and the controls are specific (not “take care” and “use PPE”)
- ✓ Named supervisor and competent person, with operative sign-off space
- ✓ Emergency and rescue arrangements that work for this site
The report builder runs these as pre-submission checks before you download — or run an existing document through the free RAMS pre-submission checker.
Frequently asked questions
Who should write a power flushing RAMS?
Someone competent to plan the work — usually the contractor doing the job or their supervisor. A template like this gives you the recognised hazards and controls for power flushing, but the person signing it off must review it as the competent person and confirm it matches the actual site and method.
How long is the RAMS valid for?
Until something changes — there's no fixed expiry in law. Review it if the method, site conditions, equipment or people change, after any incident or near miss, and at sensible intervals on longer jobs. Date the review and re-brief the team.
What regulations apply to power flushing?
Control of Substances Hazardous to Health Regulations 2002 (COSHH), Manual Handling Operations Regulations 1992, Management of Health and Safety at Work Regulations 1999, reg 3 — risk assessment are the main ones, alongside Electricity at Work Regulations 1989, Health and Safety at Work etc. Act 1974, section 3. The Health and Safety at Work etc. Act 1974 and CDM 2015 apply to all construction work.
Does a method statement need to be site-specific?
Yes — this is the most common reason documents get sent back. Principal contractors reject generic copy-paste RAMS. Your document should name the site, access arrangements, dates, supervisor and any site-specific hazards. The RamsDocs builder fills these in for you and flags what's missing before you download.
Is this template free?
Yes — everything on RamsDocs is free during early access, including building a site-specific version of this RAMS and downloading the PDF. No card required.