Notice: This blog piece was created prior to the formation of the British Precast Drainage Association.

Posted by & filed under Maintenance.

JettingCodePracticeOne of the most common forms of maintenance carried out on wastewater pipelines is high pressure water jetting; a process used to ensure that pipes run free of blockages and to remove accumulated material that would otherwise compromise the hydraulic performance of the system.

In the UK, sewer jetting is a widely used technique for clearing blocked pipelines with comparatively little routine preventive maintenance on sewer networks. As such, it is generally considered an emergency operation and there is a considerable burden on the operative to clear the blockage quickly.

Some pipe materials such as concrete and clay have a very high tolerance to the jetting pressures often required to remove blockages and some water companies already specify 4000psi minimum jetting resilience for sewers, so it would make sense for this to be consistently applied nationwide.

Some may argue that pipelines can be cleared at lower jetting pressures, but the risk remains that higher pressures may sometimes be used to clear stubborn blockages and in these situations some pipes of certain materials, such as thin walled plastic, are vulnerable and may become damaged.

When specifying a pipe with a high jetting resilience such as concrete, an indirect benefit of superior robustness, strength and durability can be achieved. Click here to download the Jetting Factsheet

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