DEM/Specific/TBT-DEM-029

Hydro Demolition

Demolition › Specific › Hydro Demolition

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Hydro demolition uses ultra-high-pressure water jets to remove concrete without damaging reinforcement steel.
Operating pressures typically range from 700 to 2,500 bar — far beyond standard pressure washing equipment.
The process is commonly used for bridge deck repairs, structural strengthening, and concrete patch repairs.
Water at these pressures will cut through skin, muscle, and bone instantly on direct contact.
The Pressure Systems Safety Regulations 2000 apply to all hydro demolition equipment and hose assemblies.
Operators must hold specific hydro demolition training certification from a recognised provider.
Noise levels from hydro demolition typically exceed 100 dB(A), requiring mandatory hearing protection zones.
The work generates large volumes of contaminated slurry that must be contained and disposed of correctly.
Exclusion zones of at least 10 metres must be established around the operating lance at all times.
Robotic hydro demolition systems reduce operator exposure but still require trained supervision.

Injection injuries	Water at 700+ bar penetrates skin instantly, injecting fluid deep into tissue causing life-threatening infection and necrosis.
Extreme noise	Noise levels above 100 dB(A) require mandatory hearing protection zones and strict exposure time limits.
Environmental control	Contaminated slurry must be captured, filtered, and disposed of correctly to prevent watercourse pollution.

Don't

Ensure all operators hold valid hydro demolition training and competency certification.
Establish a minimum 10-metre exclusion zone around the operating lance before starting.
Wear full PPE including visor, waterproofs, steel toe boots, and hearing protection.
Inspect all hoses, couplings, and safety interlocks before each shift begins.
Use dead-man controls that shut off water pressure when the trigger is released.
Contain all slurry and runoff using bunds, sumps, and sediment filtration systems.
Brief all nearby workers on the exclusion zone and communication procedures used.
Monitor hose condition during use — any bulging, cracking, or leaking requires shutdown.
Plan the work sequence to control noise impact on neighbouring properties and workers.
Ensure adequate first aid provision for high-pressure water injection injuries on site.

DON'T point the lance at any person, even when the system is depressurised.
DON'T enter the exclusion zone while the lance is operating under any circumstances.
DON'T use hoses or couplings that are not rated for the operating pressure.
DON'T operate hydro demolition equipment without dead-man trigger controls fitted.
DON'T allow slurry to discharge into drains, watercourses, or onto open ground.
DON'T work without hearing protection within 25 metres of the demolition operation.
DON'T attempt to repair hoses or fittings while the system is pressurised.
DON'T treat a high-pressure water cut as a minor injury — seek hospital treatment.
DON'T assume robotic systems need no supervision — trained operators must be present.
DON'T skip the daily equipment inspection even if the system ran fine yesterday.

See also: Demolition Safety Awareness | Noise Management and Community Impact

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