Technical guidance on deposits, surfaces and washwater

Jetting and deposit removal library

Guidance on deposits, obstructions, surface preparation and washwater recovery, including the main points that affect the choice of cleaning method.

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24 reference records · 5 detailed guides

What affects the choice of jetting method

The material to be removed is only part of the job. Pipe or surface condition, access, isolation, washwater recovery and the finish required can all change the method.

Deposit and process: what the material is, how it formed and any useful product or sample information.
Pipe or surface: dimensions, construction, condition and any coatings, linings or previous repairs.
Work area: access, isolation and whether the equipment can be taken out of service.
Recovery and finish: how solids and washwater will be collected, and how the finished work will be checked.

Reference sources for this library

These references cover the applications, safety points and environmental limits used across the library. Manufacturer material describes the named equipment or application, not whether it is suitable for every job. Regulatory and safety guidance is used only within its stated scope.

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Loose deposits

Silt and grit in drainage systems

Silt, sand and grit can reduce drainage capacity. Good desilting removes the material from the system rather than moving it to the next restriction.

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Technical notes

Material: Silt, sand and grit
Common locations: Drain runs, catchpits and culverts
Main requirement: Mobilise the deposit and recover it from the system
Check afterwards: Remaining deposits, defects and the flow route

Drainage layout and outfall
Likely sediment source and possible contamination
Affected length, depth and available access
Any link with rainfall or site operations

Pollution prevention for businesses - GOV.UK

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Waste capture and planning

Suspended silt

Silt mobilised during cleaning still has to be contained and recovered. Its source and possible contamination affect how the water and settled solids should be managed.

Pollution prevention for businesses - GOV.UK

Original source and further information

Technical notes