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The Whirlwind™ Method

Two diesel engines power the blowers producing sufficient air power to generate a turbulent airflow through the pipe work. The blowers can be operated individually or in parallel to produce a turbulent air flow under pressure in different diameter pipelines.


Air from the blowers is discharged into the main via flexible outlet pipe work. Firstly a low pressure air flow is applied to the section to be cleaned to remove any residual water from the pipeline.

Having removed the water the hot air produced by the blowers will then dry the surface of the pipe and the tubercles. Both free airflow and start pressures may then be established prior to commencing cleaning.

Aggregate is stored in pressurised hoppers. The aggregate is fed from the hopper into the outlet pipe work in a controlled manner using a pressurised conveyor. The speed of the conveyor is variable so different application rates can be achieved dependant on the level of contamination. This allows a uniform distribution of aggregate into the air flow and along the pipeline being cleaned.

The turbulent nature of the air flow causes the aggregate to be thrown against the pipe wall, impinging and dislodging the tubercles from the inside of the pipe. The tubercles are broken down by the aggregate. Due to the friable nature of the tubercles the tubercles break down easily and are carried along the pipeline with the air flow.

A hose is connected between the pipeline and receiver to transfer the waste aggregate and tubercle debris from the pipeline to the receiver. The aggregate and tubercle debris is separated from the air flow inside the receiver and the air flow is discharged from the receiver via a filter to atmosphere.

The waste resulting from the cleaning operation may be used as backfill around the pipe following completion of the lining operations.

Tel: +44(0)1978 661183 | Fax: +44(0)1978 661184 | Email: info@whirlwind.uk.com