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.

Technical guidanceSources and further reading

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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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Hard deposits

Mineral scale in pipes

Mineral scale can reduce pipe bore and flow. The deposit and the condition of the pipe need to be understood before a removal method is chosen.

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Technical notes
Deposit
Mineral scale or suspected mineral build-up
Key distinction
Deposit versus pipe wall, lining or other obstruction
Check first
Pipe material, condition and bore
Success measure
Required passage restored without unacceptable pipe damage
  • Pipe material, diameter and accessible length
  • CCTV or other inspection showing the build-up
  • Known linings, repairs or weak sections
  • Drainage, recovery and discharge arrangements

Code of Practice - Water Jetting Association

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Published by High Pressure Jetting. Sources checked 12 September 2026. Editorial policy.

Corrections are checked against the published entry and its supporting source.

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Method advice can take account of the deposit, the pipe or surface beneath it, access, isolation and the way solids and washwater will be recovered.

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